discussion/index.ndjson

@@ -1,6 +1,6 @@
-{"type":"meta","next_id":{"DSC":66,"AGD":69,"DEC":50,"PLN":129,"LSN":66,"CLSN":1}}
+{"type":"meta","next_id":{"DSC":66,"AGD":69,"DEC":51,"PLN":130,"LSN":67,"CLSN":1}}
 {"type":"discussion","id":"DSC-0065","status":"open","ticket":"multi-frontend-avoid-premature-abstractions","title":"Evitar abstracoes prematuras na preparacao multi-frontend","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","studio","frontend","architecture","multi-frontend","simplicity"],"agendas":[{"id":"AGD-0068","file":"AGD-0068-multi-frontend-avoid-premature-abstractions.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
-{"type":"discussion","id":"DSC-0064","status":"open","ticket":"multi-frontend-architectural-tests","title":"Testes arquiteturais para fronteiras multi-frontend","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","studio","frontend","architecture","tests","multi-frontend"],"agendas":[{"id":"AGD-0067","file":"AGD-0067-multi-frontend-architectural-tests.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
+{"type":"discussion","id":"DSC-0064","status":"done","ticket":"multi-frontend-architectural-tests","title":"Testes arquiteturais para fronteiras multi-frontend","created_at":"2026-07-15","updated_at":"2026-09-19","tags":["compiler","compiler-general","studio","frontend","architecture","tests","multi-frontend"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0066","file":"discussion/lessons/DSC-0064-multi-frontend-architectural-tests/LSN-0066-archunit-guards-java-multi-frontend-boundaries.md","status":"done","created_at":"2026-09-19","updated_at":"2026-09-19"}]}
 {"type":"discussion","id":"DSC-0063","status":"done","ticket":"multi-frontend-synthetic-test-frontend","title":"Frontend sintetico de teste para provar neutralidade do pipeline","created_at":"2026-07-15","updated_at":"2026-09-19","tags":["compiler","compiler-general","frontend","tests","backend","multi-frontend"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0065","file":"discussion/lessons/DSC-0063-multi-frontend-synthetic-test-frontend/LSN-0065-synthetic-test-frontend-proves-pipeline-neutrality.md","status":"done","created_at":"2026-09-19","updated_at":"2026-09-19"}]}
 {"type":"discussion","id":"DSC-0062","status":"done","ticket":"multi-frontend-pvm-neutrality","title":"Neutralidade da PVM e identificacao PBX independente de PBS","created_at":"2026-07-15","updated_at":"2026-09-18","tags":["vm-arch","runtime","pvm","pbx","compiler","multi-frontend"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0061","file":"discussion/lessons/DSC-0062-multi-frontend-pvm-neutrality/LSN-0061-pbx-runtime-boundary.md","status":"done","created_at":"2026-09-18","updated_at":"2026-09-18"}]}
 {"type":"discussion","id":"DSC-0061","status":"done","ticket":"multi-frontend-sdk-canonical-definition","title":"Auditoria e centralizacao gradual da definicao canonica do SDK","created_at":"2026-07-15","updated_at":"2026-09-19","tags":["compiler","compiler-general","sdk","stdlib","hostcalls","intrinsics","multi-frontend"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0064","file":"discussion/lessons/DSC-0061-multi-frontend-sdk-canonical-definition/LSN-0064-runtime-owns-console-abi-pbs-is-delivery.md","status":"done","created_at":"2026-09-19","updated_at":"2026-09-19"}]}

discussion/lessons/DSC-0064-multi-frontend-architectural-tests/LSN-0066-archunit-guards-java-multi-frontend-boundaries.md

@@ -0,0 +1,151 @@
+---
+id: LSN-0066
+ticket: multi-frontend-architectural-tests
+title: ArchUnit guards Java multi-frontend boundaries
+created: 2026-09-19
+tags: [compiler, compiler-general, studio, frontend, architecture, tests, multi-frontend]
+---
+
+# ArchUnit guards Java multi-frontend boundaries
+
+## Original Problem
+
+The multi-frontend boundaries already existed in specs and lessons: common
+code selects a frontend by `languageId`, `IRBackend` is language-neutral,
+lifecycle assembly is common, and PBS is one provider. The automated
+protection did not match that model.
+
+The old guards walked Java source and searched for substrings:
+
+- `import p.studio.compiler.pbs`
+- `new PBSFrontendPhaseService(`
+- `new PbsEditorialSupportService(`
+
+Those checks missed field, signature, and constructor coupling. They also
+treated `p.studio.compiler.pbs` as the whole PBS surface. Facades such as
+`PBSFrontendProvider`, `PBSDefinitions`, and `PBSFrontendPhaseService` live
+in the PBS module but not in that package. `prometeu-app` and
+`prometeu-lsp-v1` declared an `implementation` dependency on PBS without
+importing any PBS type.
+
+## Consolidated Decision
+
+Java multi-frontend boundaries are enforced by **ArchUnit + JUnit 5**, not by
+source substring search, except for the `__pbs.` literal scan that bytecode
+cannot see.
+
+Durable locks from DEC-0050:
+
+- ArchUnit is test-only, pinned in `gradle/libs.versions.toml`.
+- Rules live in the test-only Gradle project `:prometeu-architecture-tests`.
+  That project has no production sources. It is not a plugin loader.
+- A PBS type is a class whose bytecode originates from
+  `:prometeu-compiler:frontends:prometeu-frontend-pbs`. Package
+  `p.studio.compiler.pbs` is not the complete boundary. Name prefixes
+  `PBS*` / `Pbs*` are not the identity.
+- Production may depend on PBS types only in:
+  - the PBS module itself;
+  - `prometeu-frontend-registry` / `FrontendRegistryService`, and only on
+    `PBSFrontendProvider` and `PBSDefinitions`.
+- `AppContainer` is not a PBS composition root. It may call
+  `FrontendRegistryService.bootstrapDefaults()`. It must not instantiate PBS
+  types.
+- `synth` is not in the production allowlist and must not be registered in
+  `bootstrapDefaults()`.
+- Runtime, PVM, and the Rust repository stay out of this discussion
+  (LSN-0061).
+- `IRBackendExecutableContractTest` remains the public-contract shape audit.
+  ArchUnit covers module-origin dependence.
+
+Do not migrate PBS facades into another package just to make the test
+easier. Do not ban the word `PBS` in docs, fixtures, or comments.
+
+## Final Implementation
+
+`:prometeu-architecture-tests` imports production classes under `p.studio`
+with `ImportOption.DoNotIncludeTests` and applies three ArchUnit rules:
+
+1. classes outside the PBS module and the registry must not depend on
+   PBS-module types;
+2. registry production may depend only on `PBSFrontendProvider` and
+   `PBSDefinitions` from that module;
+3. frontend-api `p.studio.compiler.models` must not depend on PBS-module
+   types.
+
+A separate JUnit test walks `build.gradle.kts` files and allows the PBS
+project dependency only for:
+
+- `:prometeu-compiler:prometeu-frontend-registry` as `implementation`/`api`;
+- `:prometeu-architecture-tests` as `testImplementation` (needed to classify
+  class origin).
+
+The `__pbs.` source scan moved to
+`CommonBackendPbsPrefixScanTest` and still covers `backend/`, `lifecycle/`,
+and `workspaces/stages/`.
+
+Gradle graph cleanup:
+
+- `prometeu-app` and `prometeu-lsp-v1` no longer `implementation` PBS.
+  Runtime classloading of `PBSFrontendProvider` still comes through the
+  registry's implementation dependency.
+- `prometeu-studio` no longer `testImplementation` PBS. No studio test
+  compiled against PBS types.
+
+Source-walk import/constructor tests were deleted.
+`FrontendProviderBoundaryTest` keeps only
+`compileOnlyFrontendProviderMayOmitLanguageService`.
+
+Specs 19 §11 and 20 now say common/platform code must not depend on types
+from the PBS frontend module. Matrix rows G19-11.6, G20-4.1.2, and G20-4.3.3
+point at the ArchUnit rules and the `__pbs.` scan.
+
+## Examples
+
+Good:
+
+- ArchUnit failure names the class that depends on a PBS-module type,
+  including a facade in package `p.studio.compiler`.
+- Registry `bootstrapDefaults()` constructs `PBSFrontendProvider`. That is
+  the allowed composition root.
+- App calls `FrontendRegistryService.bootstrapDefaults()` and has no PBS
+  project dependency.
+
+Bad:
+
+- Searching source for `import p.studio.compiler.pbs` and calling the
+  boundary protected.
+- Treating `AppContainer` as the place that may `new PBSFrontendProvider()`.
+- Identifying PBS by class name prefix, so a future `PbsLike` helper in
+  common code is banned or a PBS facade is missed.
+- Adding ArchUnit to `java-common-conventions` for every module.
+
+## Pitfalls
+
+- Same Java package does not mean same Gradle module.
+  `FrontendRegistryService` and `PBSFrontendProvider` both sit in
+  `p.studio.compiler`. Origin is the module path or JAR name.
+- `@AnalyzeClasses` classes must not mix `@ArchTest` and Jupiter `@Test` on
+  the same class. The ArchUnit engine owns `@ArchTest`.
+- `DoNotIncludeTests` is required. The architecture-test sources themselves
+  reference PBS types in order to name the allowlist.
+- Removing PBS from app/lsp compile classpath is safe only because registry
+  still `implementation`s PBS, which is runtime-transitive.
+- `testImplementation` of PBS on studio is not a production leak, but if no
+  studio test needs PBS types it is still a lying graph. The allowlist test
+  rejects it.
+- Do not point ArchUnit at the Rust runtime. `__pbs.` in Java source is a
+  string contract, not a type dependency.
+
+## References
+
+- Decision: `DEC-0050`
+- Plan: `PLN-0129`
+- Related lessons: `LSN-0055`, `LSN-0059`, `LSN-0062`, `LSN-0063`,
+  `LSN-0061`, `LSN-0065`
+- `docs/specs/compiler/19. Verification and Safety Checks Specification.md`
+- `docs/specs/compiler/20. IRBackend to IRVM Lowering Specification.md`
+- `docs/specs/compiler/22. Backend Spec-to-Test Conformance Matrix.md`
+- `prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsModuleBoundaryArchTest.java`
+- `prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsGradleDependencyAllowlistTest.java`
+- `prometeu-compiler/prometeu-frontend-registry/src/main/java/p/studio/compiler/FrontendRegistryService.java`
+- `prometeu-compiler/prometeu-frontend-api/src/test/java/p/studio/compiler/models/IRBackendExecutableContractTest.java`

discussion/workflow/agendas/AGD-0067-multi-frontend-architectural-tests.md

@@ -1,79 +0,0 @@
----
-id: AGD-0067
-ticket: multi-frontend-architectural-tests
-title: Testes arquiteturais para fronteiras multi-frontend
-status: open
-created: 2026-07-15
-resolved:
-decision:
-tags: [compiler, compiler-general, studio, frontend, architecture, tests, multi-frontend]
----
-
-# Agenda - Criar testes arquiteturais
-
-## Objetivo
-
-Domain owner: `compiler/general`, com impacto em `studio` e `vm-arch`.
-
-Definir testes que protejam fronteiras: backend comum sem PBS, IR comum sem AST PBS, Studio comum sem instanciacao PBS fora do composition root e runtime neutro.
-
-## Contexto atual
-
-O repo ja tem testes Java para backend, bytecode e IRVM. ArchUnit pode ser util, mas o alinhamento proibe adicionar biblioteca arquitetural quando testes simples bastarem.
-
-## Escopo
-
-- Escolher ferramenta minima.
-- Definir regras por pacote.
-- Adicionar testes que sejam baratos e claros.
-
-## Fora de escopo
-
-- Cobrir toda arquitetura do monorepo.
-- Adicionar ArchUnit sem justificativa concreta.
-- Bloquear referencias PBS em testes PBS ou no frontend PBS.
-
-## Arquivos e componentes a inspecionar
-
-- `build.gradle.kts` e version catalog se houver.
-- `prometeu-compiler/prometeu-build-pipeline/src/test/java/...`
-- `prometeu-compiler/frontends/prometeu-frontend-pbs/src/test/java/...`
-- `prometeu-studio/src/test/java/...`
-- pacotes runtime/PVM quando presentes
-
-## Alteracoes propostas
-
-Opcao A: testes Java/reflection simples para imports, nomes de tipos e packages publicos.
-
-Opcao B: ArchUnit caso a quantidade de regras e modulos justifique.
-
-Recomendacao inicial: comecar com testes simples; reavaliar ArchUnit se as regras virarem frageis.
-
-## Estrategia de implementacao
-
-Definir allowlist de packages PBS, composition root e testes PBS. Escrever verificacoes independentes por dominio para falhas legiveis.
-
-## Testes necessarios
-
-- Backend/common nao importa `frontend.pbs`, `parser.pbs` ou `semantic.pbs`.
-- IR comum nao expoe tipos PBS.
-- Studio comum nao instancia servicos PBS fora da allowlist.
-- Runtime nao usa nomenclatura ou semantica PBS.
-
-## Criterios de aceitacao
-
-- Regras rodam no build local.
-- Falhas apontam arquivo/pacote responsavel.
-- Excecoes autorizadas estao documentadas.
-
-## Riscos
-
-- Teste textual produzir falso positivo por docs ou fixtures.
-- Criar barreira rigida antes de definir provider e lifecycle.
-
-## Decisoes que devem ser registradas
-
-- Ferramenta escolhida.
-- Allowlist de packages.
-- Ordem de introducao das regras.
-

docs/specs/compiler/19. Verification and Safety Checks Specification.md

@@ -210,4 +210,4 @@ This specification MUST NOT be read as authorizing:
 - extracting PBS linking;
 - or reopening lifecycle-assembly ownership.
 
-Platform validators MUST NOT import `p.studio.compiler.pbs` and MUST NOT discover roles from `__pbs.` prefixes.
+Platform validators MUST NOT depend on types from the PBS frontend module (`prometeu-frontend-pbs`). The package `p.studio.compiler.pbs` is not the complete boundary; facades shipped by that module remain PBS-owned. Platform validators MUST NOT discover roles from `__pbs.` prefixes.

docs/specs/compiler/20. IRBackend to IRVM Lowering Specification.md

@@ -92,7 +92,7 @@ The declaration MUST represent, using ordered collections and typed ids:
 
 References MUST use `ModuleId`, `FileId`, `CallableId`, a typed role, and source attribution. The public shape MUST NOT expose maps, sets, callbacks, compiler services, or frontend-owned types.
 
-`AssembleLifecyclePipelineStage` MUST run after `FrontendPhasePipelineStage` and before `LowerToIRVMPipelineStage`. `LifecycleAssemblerService` is the only owner of derived lifecycle artifacts: module init, project-init wrapper, published frame wrapper, physical entrypoint, and hidden boot guard. Those artifacts MUST use deterministic neutral internal identities. Common code MUST NOT discover roles from `__pbs.*` prefixes or depend on PBS packages.
+`AssembleLifecyclePipelineStage` MUST run after `FrontendPhasePipelineStage` and before `LowerToIRVMPipelineStage`. `LifecycleAssemblerService` is the only owner of derived lifecycle artifacts: module init, project-init wrapper, published frame wrapper, physical entrypoint, and hidden boot guard. Those artifacts MUST use deterministic neutral internal identities. Common code MUST NOT discover roles from `__pbs.*` prefixes or depend on types from the PBS frontend module (`prometeu-frontend-pbs`). The package `p.studio.compiler.pbs` is not the complete boundary.
 
 The declaration MUST remain available on the assembled `IRBackend` as typed provenance. Downstream inspection MUST use roles, ids, and origins rather than synthetic names.
 
@@ -104,7 +104,7 @@ The common backend contract MUST NOT expose or require:
 2. PBS parser cursors, parse contexts, parse nodes, or token kinds,
 3. PBS semantic validator internals,
 4. PBS editorial or language-service objects,
-5. or any type under a language frontend package as part of the public backend handoff.
+5. or any type from the PBS frontend module (`prometeu-frontend-pbs`) or an equivalent language frontend module as part of the public backend handoff.
 
 ## 4.2 Serializable-by-Design Contract Shape
 

docs/specs/compiler/22. Backend Spec-to-Test Conformance Matrix.md

@@ -45,17 +45,17 @@ to concrete positive/negative test evidence and current status.
 | G19-11.3 | Platform diagnostics MUST use `COMMON_*` / `LOWER_IRVM_*` / `MARSHAL_*` and MUST copy origin/span when present. | `ValidationOwnershipSpecTest#spec19MustBeCompilerGeneralAndPublishValidationOwnership`; `LifecycleAssemblerServiceTest#assembleMustRejectMissingFrameRootWithoutRepair` | N/A | pass | Code families and span policy are normative in spec 19 section 11.1. |
 | G19-11.4 | The same fact MAY exist as a language diagnostic and a platform diagnostic with distinct identities. | `ValidationOwnershipSpecTest#spec19MustBeCompilerGeneralAndPublishValidationOwnership` | N/A | pass | Dual reporting is required when a check reads both source and common contract. |
 | G19-11.5 | Host admission MUST split source attribute shape from canonical `IRReservedMetadata` identity without moving the PBS validator in this plan. | `ValidationOwnershipSpecTest#spec19MustBeCompilerGeneralAndPublishValidationOwnership` | N/A | pass | Classified as platform; validator remains in the PBS package. |
-| G19-11.6 | Platform validators MUST NOT import PBS packages or match `__pbs.` prefixes. | `CommonBackendArchitectureTest#commonBackendMustNotImportPbsFrontendPackages`; `CommonBackendArchitectureTest#commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes` | N/A | pass | Guard covers backend, lifecycle, and all common pipeline stages. |
+| G19-11.6 | Platform validators MUST NOT depend on PBS frontend module types or match `__pbs.` prefixes. | `PbsModuleBoundaryArchTest#productionOutsideAllowlistMustNotDependOnPbsModuleTypes`; `CommonBackendPbsPrefixScanTest#commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes` | N/A | pass | ArchUnit covers PBS module origin, including facades outside `p.studio.compiler.pbs`; source scan still rejects `__pbs.` in backend, lifecycle, and common pipeline stages. |
 | PBS12-11 | PBS diagnostics MUST NOT claim common structural lifecycle/IRVM failures as PBS required coverage. | `ValidationOwnershipSpecTest#pbsDiagnosticsMustNotClaimCommonStructuralFailures` | N/A | pass | PBS spec 12 points those failures at spec 19 section 11 and spec 20. |
 | G20-4.1.1 | `IRBackend` MUST be the common frontend-to-backend executable handoff. | `LowerToIRVMServiceTest#lowerMustAcceptManuallyConstructedCommonIRBackend` | N/A | pass | Direct backend lowering from manually constructed common IRBackend proves PBS parser/frontend services are not required. |
-| G20-4.1.2 | Common backend code MUST NOT depend on `p.studio.compiler.pbs`. | `CommonBackendArchitectureTest#commonBackendMustNotImportPbsFrontendPackages` | N/A | pass | Source-level architectural guard rejects PBS frontend imports in common backend packages. |
+| G20-4.1.2 | Common backend code MUST NOT depend on types from the PBS frontend module. | `PbsModuleBoundaryArchTest#productionOutsideAllowlistMustNotDependOnPbsModuleTypes`; `PbsModuleBoundaryArchTest#irBackendModelsMustNotDependOnPbsModuleTypes` | N/A | pass | ArchUnit rejects PBS-module origin types in common production code, including facades outside `p.studio.compiler.pbs`. |
 | G20-4.1.3 | Public `IRBackend` contract MUST NOT expose PBS AST, token, parser, semantic, or editorial types. | `IRBackendExecutableContractTest#publicIRBackendContractMustNotExposePbsTypes` | N/A | pass | Reflection guard covers public contract fields, constructors, methods, and record components. |
 | G20-4.2.1 | Public `IRBackend` contract types MUST remain modelable as an acyclic, deterministic data graph. | `IRBackendExecutableContractTest#publicIRBackendContractMustExposeOnlySerializableShapes`; `IRBackendExecutableContractTest#aggregatorMustEmitDeterministicOrderedPublicContractShape` | N/A | pass | Covers public shape guardrails, generic type arguments, ordered aggregate emission, table remapping, and capability de-duplication order. |
 | G20-4.2.2 | Public `IRBackend` contract types MUST NOT expose callbacks, services, mutable/unordered collection contracts, frontend-owned objects, process-dependent lazy values, cyclic public references, or wire-format commitments. | `IRBackendExecutableContractTest#publicIRBackendContractMustExposeOnlySerializableShapes` | N/A | pass | Reflection guard covers public contract fields, constructors, methods, record components, and generic type arguments. |
 | G20-4.2.3 | Public `IRBackend` cross-object references MUST use explicit ids or stable symbolic keys. | `IRBackendExecutableContractTest#publicIRBackendContractAuditMustClassifyAllowedSupportTypes`; `IRBackendExecutableContractTest#publicIRBackendContractMustUseExplicitIdsOrStableKeysForKnownReferences` | N/A | pass | Current audit found no concrete public serialization leak requiring model correction. Existing `FileId`, `ModuleId`, `CallableId`, and `IntrinsicId` remain explicit table-scoped identifiers. |
 | G20-4.3.1 | Executable `IRBackend` MUST carry a typed, ordered, id-based `IRLifecycleDeclaration` as provenance. | `IRBackendExecutableContractTest#aggregatorMustRemapTypedLifecycleReferencesAndPreserveDeclaredModuleOrder`; `LifecycleAssemblerServiceTest#assembleMustMaterializeNeutralLifecycleArtifactsInDeclaredOrder` | `IRBackendExecutableContractTest#aggregatorMustOmitLifecycleDeclarationWhenNoFileContributesOne` | pass | Declaration uses `ReadOnlyList`, typed ids, roles, and source attribution; aggregator remaps ids with explicit module order. |
 | G20-4.3.2 | Missing lifecycle declaration MUST mean a deliberately non-executable handoff and MUST NOT synthesize entrypoints. | `LifecycleAssemblerServiceTest#assembleMustNoOpWhenLifecycleDeclarationIsAbsent`; `AssembleLifecyclePipelineStageTest#runMustNoOpForDeliberatelyNonExecutableHandoff` | N/A | pass | Assembler and stage leave the backend unchanged when the declaration is absent. |
-| G20-4.3.3 | Common lifecycle assembly MUST be the exclusive owner of derived artifacts and MUST use neutral identities. | `LifecycleAssemblerServiceTest#assembleMustMaterializeNeutralLifecycleArtifactsInDeclaredOrder`; `CommonBackendArchitectureTest#commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes` | `LifecycleAssemblerServiceTest#assembleMustRejectPreMaterializedDerivedArtifacts` | pass | Derived wrappers and boot guard are common-owned; architecture guard rejects PBS imports and `__pbs.` prefix matching. |
+| G20-4.3.3 | Common lifecycle assembly MUST be the exclusive owner of derived artifacts and MUST use neutral identities. | `LifecycleAssemblerServiceTest#assembleMustMaterializeNeutralLifecycleArtifactsInDeclaredOrder`; `CommonBackendPbsPrefixScanTest#commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes`; `PbsModuleBoundaryArchTest#productionOutsideAllowlistMustNotDependOnPbsModuleTypes` | `LifecycleAssemblerServiceTest#assembleMustRejectPreMaterializedDerivedArtifacts` | pass | Derived wrappers and boot guard are common-owned; ArchUnit rejects PBS-module types and the source scan rejects `__pbs.` prefix matching. |
 | G20-6.2 | `IRVM_EXT` MUST declare structural metadata (`pops/pushes/is_branch/is_terminator`). | `IRVMValidatorTest#validateMustApplyStructuralMetadataForCustomInternalExtension`; `IRVMValidatorTest#validateMustRejectCustomInternalExtensionWhenStructuralMetadataUnderflowsStack`; `IRVMOp` record contract (`pops/pushes/branch/terminator/internal`) | N/A | pass | Dedicated extension fixtures now assert structural metadata is consumed by validation behavior. |
 | G20-6.3 | `IRVM_EXT` MUST be eliminable before bytecode emission. | `OptimizeIRVMServiceTest#optimizeDefaultPassesMustEliminateUnreachableInternalExtensionBeforeEmission` | `EmitBytecodePipelineStageTest#runMustFailWhenInternalOpcodesRemain`; `EmitBytecodePipelineStageTest#runMustFailWhenInternalOpcodesRemainEvenWithNonEmptyEmissionPlan`; `IRVMValidatorTest#validateMustRejectInternalOpcodeWhenConfigured` | pass | Optimizer elimination path and emit-stage hard rejection path are both covered. |
 | G20-6.4 | IRVM MUST preserve per-function slot and identity headers. | `IRVMProgramTest#constructorMustRejectModuleAndEmissionPlanMismatch` | `IRVMProgramTest#constructorMustRejectModuleAndEmissionPlanMismatch` | pass | Header mismatch is rejected deterministically. |

gradle/libs.versions.toml

@@ -5,6 +5,7 @@ jackson = "2.18.2"
 jacoco = "0.8.12"
 lombok = "1.18.32"
 junit-jupiter = "5.12.1"
+archunit = "1.4.2"
 slf4j = "2.0.7"
 lsp4j = "1.0.0"
 
@@ -19,6 +20,7 @@ apache-commons-collections = { group = "org.apache.commons", name = "commons-col
 jacoco-core = { group = "org.jacoco", name = "org.jacoco.core", version.ref = "jacoco" }
 lombok = { group = "org.projectlombok", name = "lombok", version.ref = "lombok" }
 junit-jupiter = { group = "org.junit.jupiter", name = "junit-jupiter", version.ref = "junit-jupiter" }
+archunit-junit5 = { group = "com.tngtech.archunit", name = "archunit-junit5", version.ref = "archunit" }
 slf4j-api = { group = "org.slf4j", name = "slf4j-api", version.ref = "slf4j" }
 slf4j-simple = { group = "org.slf4j", name = "slf4j-simple", version.ref = "slf4j" }
 lsp4j = { group = "org.eclipse.lsp4j", name = "org.eclipse.lsp4j", version.ref = "lsp4j" }

prometeu-app/build.gradle.kts

@@ -7,7 +7,6 @@ dependencies {
     implementation(project(":prometeu-infra"))
     implementation(project(":prometeu-lsp:prometeu-lsp-api"))
     implementation(project(":prometeu-lsp:prometeu-lsp-v1"))
-    implementation(project(":prometeu-compiler:frontends:prometeu-frontend-pbs"))
     implementation(project(":prometeu-compiler:prometeu-frontend-registry"))
     implementation(project(":prometeu-packer:prometeu-packer-api"))
     implementation(project(":prometeu-packer:prometeu-packer-v1"))

prometeu-architecture-tests/build.gradle.kts

@@ -0,0 +1,23 @@
+plugins {
+    id("gradle.java-library-conventions")
+}
+
+dependencies {
+    testImplementation(libs.archunit.junit5)
+
+    testImplementation(project(":prometeu-compiler:frontends:prometeu-frontend-pbs"))
+    testImplementation(project(":prometeu-compiler:prometeu-frontend-registry"))
+    testImplementation(project(":prometeu-compiler:prometeu-compiler-core"))
+    testImplementation(project(":prometeu-compiler:prometeu-frontend-api"))
+    testImplementation(project(":prometeu-compiler:prometeu-build-pipeline"))
+    testImplementation(project(":prometeu-compiler:prometeu-deps"))
+    testImplementation(project(":prometeu-infra"))
+    testImplementation(project(":prometeu-lsp:prometeu-lsp-api"))
+    testImplementation(project(":prometeu-lsp:prometeu-lsp-v1"))
+    testImplementation(project(":prometeu-studio"))
+    testImplementation(project(":prometeu-app"))
+}
+
+tasks.named<JacocoReport>("jacocoTestReport") {
+    enabled = false
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/CommonBackendPbsPrefixScanTest.java

@@ -0,0 +1,63 @@
+package p.studio.architecture;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+class CommonBackendPbsPrefixScanTest {
+    private static final String COMPILER_SOURCE_ROOT =
+            "prometeu-compiler/prometeu-build-pipeline/src/main/java/p/studio/compiler";
+    private static final List<String> GUARDED_RELATIVE_ROOTS = List.of(
+            "backend",
+            "lifecycle",
+            "workspaces/stages");
+    private static final String FORBIDDEN_PBS_PREFIX = "__pbs.";
+
+    @Test
+    void commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes() throws IOException {
+        final var violations = new ArrayList<String>();
+        final var repoRoot = locateRepoRoot();
+        final var compilerRoot = repoRoot.resolve(COMPILER_SOURCE_ROOT);
+        for (final var relativeRoot : GUARDED_RELATIVE_ROOTS) {
+            final var root = compilerRoot.resolve(relativeRoot);
+            if (!Files.exists(root)) {
+                fail("guarded source root is missing: " + root);
+            }
+            try (final var paths = Files.walk(root)) {
+                paths.filter(path -> path.toString().endsWith(".java")).forEach(path -> {
+                    try {
+                        if (Files.readString(path).contains(FORBIDDEN_PBS_PREFIX)) {
+                            violations.add(repoRoot.relativize(path).toString());
+                        }
+                    } catch (IOException e) {
+                        throw new IllegalStateException("failed to read source file: " + path, e);
+                    }
+                });
+            }
+        }
+        assertTrue(
+                violations.isEmpty(),
+                "common lifecycle/backend code must not inspect __pbs. prefixes: " + violations);
+    }
+
+    private static Path locateRepoRoot() {
+        var cursor = Path.of(System.getProperty("user.dir")).toAbsolutePath().normalize();
+        while (cursor != null) {
+            final var hasDocs = Files.isDirectory(cursor.resolve("docs/specs/compiler"));
+            final var hasCompiler = Files.isDirectory(cursor.resolve("prometeu-compiler"));
+            if (hasDocs && hasCompiler) {
+                return cursor;
+            }
+            cursor = cursor.getParent();
+        }
+        fail("could not locate repository root from working directory");
+        throw new IllegalStateException("unreachable");
+    }
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/DescribedPredicates.java

@@ -0,0 +1,22 @@
+package p.studio.architecture;
+
+import com.tngtech.archunit.base.DescribedPredicate;
+import com.tngtech.archunit.core.domain.JavaClass;
+
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+final class DescribedPredicates {
+    private DescribedPredicates() {
+    }
+
+    static DescribedPredicate<JavaClass> notBelongingTo(final Class<?>... allowed) {
+        final Set<String> allowedNames = Arrays.stream(allowed)
+                .map(Class::getName)
+                .collect(Collectors.toUnmodifiableSet());
+        return DescribedPredicate.describe(
+                "do not belong to " + allowedNames,
+                javaClass -> !allowedNames.contains(javaClass.getName()));
+    }
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsGradleDependencyAllowlistTest.java

@@ -0,0 +1,85 @@
+package p.studio.architecture;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+class PbsGradleDependencyAllowlistTest {
+    private static final Pattern PBS_PROJECT_DEP = Pattern.compile(
+            "(\\w+)\\(\\s*project\\(\\s*\"" + Pattern.quote(PbsModuleOrigins.PBS_GRADLE_PATH) + "\"\\s*\\)");
+    private static final Map<String, Set<String>> ALLOWED_CONFIGURATIONS = Map.of(
+            ":prometeu-compiler:prometeu-frontend-registry", Set.of("implementation", "api"),
+            ":prometeu-architecture-tests", Set.of("testImplementation"));
+
+    @Test
+    void onlyAllowlistedProjectsMayDependOnThePbsFrontendModule() throws IOException {
+        final var repoRoot = locateRepoRoot();
+        final var violations = new ArrayList<String>();
+
+        try (final var paths = Files.walk(repoRoot)) {
+            paths.filter(path -> path.getFileName().toString().equals("build.gradle.kts"))
+                    .filter(path -> !path.toString().contains("/buildSrc/"))
+                    .filter(path -> !path.toString().contains("/build/"))
+                    .forEach(path -> collectViolations(repoRoot, path, violations));
+        }
+
+        assertTrue(violations.isEmpty(), "PBS Gradle project dependency allowlist violated: " + violations);
+    }
+
+    private static void collectViolations(
+            final Path repoRoot,
+            final Path buildFile,
+            final ArrayList<String> violations) {
+        final var projectPath = toProjectPath(repoRoot, buildFile);
+        if (PbsModuleOrigins.PBS_GRADLE_PATH.equals(projectPath)) {
+            return;
+        }
+
+        final String content;
+        try {
+            content = Files.readString(buildFile);
+        } catch (IOException e) {
+            throw new IllegalStateException("failed to read " + buildFile, e);
+        }
+
+        final var matcher = PBS_PROJECT_DEP.matcher(content);
+        while (matcher.find()) {
+            final var configuration = matcher.group(1);
+            final var allowed = ALLOWED_CONFIGURATIONS.getOrDefault(projectPath, Set.of());
+            if (!allowed.contains(configuration)) {
+                violations.add(projectPath + " " + configuration + " " + PbsModuleOrigins.PBS_GRADLE_PATH);
+            }
+        }
+    }
+
+    private static String toProjectPath(final Path repoRoot, final Path buildFile) {
+        final var relative = repoRoot.relativize(buildFile.getParent()).toString().replace('\\', '/');
+        if (relative.isEmpty() || ".".equals(relative)) {
+            return ":";
+        }
+        return ":" + relative.replace('/', ':');
+    }
+
+    private static Path locateRepoRoot() {
+        var cursor = Path.of(System.getProperty("user.dir")).toAbsolutePath().normalize();
+        while (cursor != null) {
+            final var hasDocs = Files.isDirectory(cursor.resolve("docs/specs/compiler"));
+            final var hasCompiler = Files.isDirectory(cursor.resolve("prometeu-compiler"));
+            if (hasDocs && hasCompiler) {
+                return cursor;
+            }
+            cursor = cursor.getParent();
+        }
+        fail("could not locate repository root from working directory");
+        throw new IllegalStateException("unreachable");
+    }
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsModuleBoundaryArchTest.java

@@ -0,0 +1,43 @@
+package p.studio.architecture;
+
+import com.tngtech.archunit.core.importer.ImportOption;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.lang.ArchRule;
+import p.studio.compiler.PBSDefinitions;
+import p.studio.compiler.PBSFrontendProvider;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClasses;
+import static p.studio.architecture.PbsModuleOrigins.fromFrontendApiModule;
+import static p.studio.architecture.PbsModuleOrigins.fromPbsModule;
+import static p.studio.architecture.PbsModuleOrigins.fromRegistryModule;
+
+@AnalyzeClasses(packages = "p.studio", importOptions = ImportOption.DoNotIncludeTests.class)
+class PbsModuleBoundaryArchTest {
+
+    @ArchTest
+    static final ArchRule productionOutsideAllowlistMustNotDependOnPbsModuleTypes = noClasses()
+            .that(fromPbsModule().negate())
+            .and(fromRegistryModule().negate())
+            .should()
+            .dependOnClassesThat(fromPbsModule())
+            .because("DEC-0050: only prometeu-frontend-pbs and prometeu-frontend-registry may depend on PBS module types");
+
+    @ArchTest
+    static final ArchRule registryMustOnlyDependOnPbsProviderFacade = noClasses()
+            .that(fromRegistryModule())
+            .should()
+            .dependOnClassesThat(
+                    fromPbsModule()
+                            .and(DescribedPredicates.notBelongingTo(PBSFrontendProvider.class, PBSDefinitions.class)))
+            .because("DEC-0050: registry may depend only on PBSFrontendProvider and PBSDefinitions");
+
+    @ArchTest
+    static final ArchRule irBackendModelsMustNotDependOnPbsModuleTypes = noClasses()
+            .that(fromFrontendApiModule())
+            .and()
+            .resideInAPackage("p.studio.compiler.models..")
+            .should()
+            .dependOnClassesThat(fromPbsModule())
+            .because("DEC-0050: public IRBackend contract types must not depend on PBS module types");
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsModuleClasspathTest.java

@@ -0,0 +1,36 @@
+package p.studio.architecture;
+
+import com.tngtech.archunit.core.importer.ClassFileImporter;
+import com.tngtech.archunit.core.importer.ImportOption;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+class PbsModuleClasspathTest {
+
+    @Test
+    void importerMustSeePbsAndRegistryModuleOrigins() {
+        final var classes = new ClassFileImporter()
+                .withImportOption(ImportOption.Predefined.DO_NOT_INCLUDE_TESTS)
+                .importPackages("p.studio");
+
+        final var pbsSample = classes.stream()
+                .filter(PbsModuleOrigins::isPbsModule)
+                .findFirst();
+        final var registrySample = classes.stream()
+                .filter(PbsModuleOrigins::isRegistryModule)
+                .findFirst();
+
+        if (pbsSample.isEmpty() || registrySample.isEmpty()) {
+            final var uris = classes.stream()
+                    .limit(20)
+                    .map(javaClass -> javaClass.getName() + " -> " + PbsModuleOrigins.sourceUri(javaClass))
+                    .toList();
+            fail("PBS/registry module origins were not visible to ArchUnit. sample URIs: " + uris);
+        }
+
+        assertTrue(pbsSample.isPresent());
+        assertTrue(registrySample.isPresent());
+    }
+}

prometeu-architecture-tests/src/test/java/p/studio/architecture/PbsModuleOrigins.java

@@ -0,0 +1,60 @@
+package p.studio.architecture;
+
+import com.tngtech.archunit.base.DescribedPredicate;
+import com.tngtech.archunit.core.domain.JavaClass;
+
+final class PbsModuleOrigins {
+    static final String PBS_GRADLE_PATH = ":prometeu-compiler:frontends:prometeu-frontend-pbs";
+
+    private PbsModuleOrigins() {
+    }
+
+    static boolean isPbsModule(final JavaClass javaClass) {
+        return uriContains(javaClass, "/prometeu-frontend-pbs/")
+                || uriContains(javaClass, "prometeu-frontend-pbs.jar");
+    }
+
+    static boolean isRegistryModule(final JavaClass javaClass) {
+        return uriContains(javaClass, "/prometeu-frontend-registry/")
+                || uriContains(javaClass, "prometeu-frontend-registry.jar");
+    }
+
+    static boolean isFrontendApiModule(final JavaClass javaClass) {
+        return uriContains(javaClass, "/prometeu-frontend-api/")
+                || uriContains(javaClass, "prometeu-frontend-api.jar");
+    }
+
+    static DescribedPredicate<JavaClass> fromPbsModule() {
+        return DescribedPredicate.describe(
+                "originate from the PBS frontend module",
+                PbsModuleOrigins::isPbsModule);
+    }
+
+    static DescribedPredicate<JavaClass> fromRegistryModule() {
+        return DescribedPredicate.describe(
+                "originate from the frontend registry module",
+                PbsModuleOrigins::isRegistryModule);
+    }
+
+    static DescribedPredicate<JavaClass> fromFrontendApiModule() {
+        return DescribedPredicate.describe(
+                "originate from the frontend-api module",
+                PbsModuleOrigins::isFrontendApiModule);
+    }
+
+    static String sourceUri(final JavaClass javaClass) {
+        return javaClass.getSource()
+                .map(source -> normalize(source.getUri().toString()))
+                .orElse("<no source>");
+    }
+
+    private static boolean uriContains(final JavaClass javaClass, final String fragment) {
+        return javaClass.getSource()
+                .map(source -> normalize(source.getUri().toString()).contains(fragment))
+                .orElse(false);
+    }
+
+    private static String normalize(final String uri) {
+        return uri.replace('\\', '/');
+    }
+}

prometeu-compiler/prometeu-build-pipeline/src/test/java/p/studio/compiler/specs/CommonBackendArchitectureTest.java

@@ -1,96 +0,0 @@
-package p.studio.compiler.specs;
-
-import org.junit.jupiter.api.Test;
-
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.List;
-
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
-
-class CommonBackendArchitectureTest {
-    private static final String COMPILER_SOURCE_ROOT =
-            "prometeu-compiler/prometeu-build-pipeline/src/main/java/p/studio/compiler";
-    private static final List<String> GUARDED_RELATIVE_ROOTS = List.of(
-            "backend",
-            "lifecycle",
-            "workspaces/stages");
-    private static final String FORBIDDEN_PBS_PACKAGE = "p.studio.compiler.pbs";
-    private static final String FORBIDDEN_PBS_PREFIX = "__pbs.";
-
-    @Test
-    void commonBackendMustNotImportPbsFrontendPackages() throws IOException {
-        final var violations = new ArrayList<String>();
-        walkGuardedSources(path -> assertNoPbsImport(path, violations));
-        assertTrue(
-                violations.isEmpty(),
-                "common backend must not import PBS frontend packages: " + violations);
-    }
-
-    @Test
-    void commonLifecycleAndBackendMustNotDiscoverRolesFromPbsNamePrefixes() throws IOException {
-        final var violations = new ArrayList<String>();
-        walkGuardedSources(path -> assertNoPbsPrefixMatching(path, violations));
-        assertTrue(
-                violations.isEmpty(),
-                "common lifecycle/backend code must not inspect __pbs. prefixes: " + violations);
-    }
-
-    private static void walkGuardedSources(final java.util.function.Consumer<Path> consumer) throws IOException {
-        final var compilerRoot = locateRepoRoot().resolve(COMPILER_SOURCE_ROOT);
-        for (final var relativeRoot : GUARDED_RELATIVE_ROOTS) {
-            final var root = compilerRoot.resolve(relativeRoot);
-            if (Files.isRegularFile(root)) {
-                consumer.accept(root);
-                continue;
-            }
-            try (final var paths = Files.walk(root)) {
-                paths.filter(path -> path.toString().endsWith(".java")).forEach(consumer);
-            }
-        }
-    }
-
-    private static void assertNoPbsImport(
-            final Path path,
-            final ArrayList<String> violations) {
-        try {
-            final var content = Files.readString(path);
-            if (content.contains("import " + FORBIDDEN_PBS_PACKAGE)
-                    || content.contains("import static " + FORBIDDEN_PBS_PACKAGE)) {
-                violations.add(locateRepoRoot().relativize(path).toString());
-            }
-        } catch (IOException e) {
-            throw new IllegalStateException("failed to read source file: " + path, e);
-        }
-    }
-
-    private static void assertNoPbsPrefixMatching(
-            final Path path,
-            final ArrayList<String> violations) {
-        try {
-            final var content = Files.readString(path);
-            if (content.contains(FORBIDDEN_PBS_PREFIX)) {
-                violations.add(locateRepoRoot().relativize(path).toString());
-            }
-        } catch (IOException e) {
-            throw new IllegalStateException("failed to read source file: " + path, e);
-        }
-    }
-
-    private static Path locateRepoRoot() {
-        var cursor = Path.of(System.getProperty("user.dir")).toAbsolutePath().normalize();
-        while (cursor != null) {
-            final var hasDocs = Files.isDirectory(cursor.resolve("docs/specs/compiler"));
-            final var hasCompiler = Files.isDirectory(cursor.resolve("prometeu-compiler"));
-            if (hasDocs && hasCompiler) {
-                return cursor;
-            }
-            cursor = cursor.getParent();
-        }
-        fail("could not locate repository root from working directory");
-        throw new IllegalStateException("unreachable");
-    }
-}

prometeu-compiler/prometeu-build-pipeline/src/test/java/p/studio/compiler/specs/FrontendProviderBoundaryTest.java

@@ -11,93 +11,11 @@ import p.studio.compiler.source.diagnostics.DiagnosticSink;
 import p.studio.utilities.logs.LogAggregator;
 import p.studio.utilities.structures.ReadOnlySet;
 
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.List;
-
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
 
 class FrontendProviderBoundaryTest {
 
-    @Test
-    void commonModulesMustNotInstantiatePbsFrontendPhaseServiceDirectly() throws IOException {
-        final var repoRoot = findRepoRoot(Path.of("").toAbsolutePath().normalize());
-        final var commonSourceRoots = List.of(
-                repoRoot.resolve("prometeu-compiler/prometeu-build-pipeline/src/main/java"),
-                repoRoot.resolve("prometeu-compiler/prometeu-deps/src/main/java"),
-                repoRoot.resolve("prometeu-studio/src/main/java"),
-                repoRoot.resolve("prometeu-app/src/main/java"));
-
-        for (final var sourceRoot : commonSourceRoots) {
-            if (!Files.exists(sourceRoot)) {
-                continue;
-            }
-
-            try (final var files = Files.walk(sourceRoot)) {
-                final var violations = files
-                        .filter(path -> path.toString().endsWith(".java"))
-                        .filter(path -> contains(path, "new PBSFrontendPhaseService("))
-                        .toList();
-                if (!violations.isEmpty()) {
-                    fail("common modules must resolve frontend compiler behavior through FrontendProvider: " + violations);
-                }
-            }
-        }
-    }
-
-    @Test
-    void commonModulesMustNotInstantiatePbsEditorialSupportServiceDirectly() throws IOException {
-        final var repoRoot = findRepoRoot(Path.of("").toAbsolutePath().normalize());
-        final var sourceRoots = List.of(
-                repoRoot.resolve("prometeu-compiler/prometeu-build-pipeline/src/main/java"),
-                repoRoot.resolve("prometeu-compiler/prometeu-deps/src/main/java"),
-                repoRoot.resolve("prometeu-lsp/prometeu-lsp-v1/src/main/java"),
-                repoRoot.resolve("prometeu-studio/src/main/java"),
-                repoRoot.resolve("prometeu-app/src/main/java"));
-
-        for (final var sourceRoot : sourceRoots) {
-            if (!Files.exists(sourceRoot)) {
-                continue;
-            }
-
-            try (final var files = Files.walk(sourceRoot)) {
-                final var violations = files
-                        .filter(path -> path.toString().endsWith(".java"))
-                        .filter(path -> contains(path, "new PbsEditorialSupportService("))
-                        .toList();
-                if (!violations.isEmpty()) {
-                    fail("common modules must resolve PBS editor behavior through FrontendProvider.languageService(): " + violations);
-                }
-            }
-        }
-    }
-
-    @Test
-    void commonLspMustNotImportPbsImplementationPackages() throws IOException {
-        final var repoRoot = findRepoRoot(Path.of("").toAbsolutePath().normalize());
-        final var sourceRoot = repoRoot.resolve("prometeu-lsp/prometeu-lsp-v1/src/main/java");
-        final var prohibitedNeedles = List.of(
-                "p.studio.compiler.PBSFrontendLanguageService",
-                "p.studio.compiler.services.PBSFrontendPhaseService",
-                "p.studio.compiler.pbs",
-                "PbsAst",
-                "PbsEditorial");
-
-        try (final var files = Files.walk(sourceRoot)) {
-            final var violations = files
-                    .filter(path -> path.toString().endsWith(".java"))
-                    .filter(path -> prohibitedNeedles.stream().anyMatch(needle -> contains(path, needle)))
-                    .toList();
-            if (!violations.isEmpty()) {
-                fail("common LSP code must consume generic frontend language-service contracts instead of PBS implementation packages: "
-                        + violations);
-            }
-        }
-    }
-
     @Test
     void compileOnlyFrontendProviderMayOmitLanguageService() {
         final FrontendProvider provider = new CompileOnlyFrontendProvider();
@@ -110,26 +28,6 @@ class FrontendProviderBoundaryTest {
                 BuildingIssueSink.empty()));
     }
 
-    private boolean contains(final Path path, final String needle) {
-        try {
-            return Files.readString(path).contains(needle);
-        } catch (IOException e) {
-            throw new IllegalStateException("failed to read " + path, e);
-        }
-    }
-
-    private Path findRepoRoot(final Path start) {
-        var current = start;
-        while (current != null) {
-            if (Files.exists(current.resolve("settings.gradle.kts"))) {
-                return current;
-            }
-            current = current.getParent();
-        }
-        fail("unable to locate repository root from " + start);
-        return start;
-    }
-
     private static final class CompileOnlyFrontendProvider implements FrontendProvider {
         private final FrontendSpec specification = FrontendSpec.builder()
                 .languageId("compile-only")

prometeu-compiler/prometeu-build-pipeline/src/test/java/p/studio/compiler/specs/ValidationOwnershipSpecTest.java

@@ -43,8 +43,11 @@ class ValidationOwnershipSpecTest {
                 content.contains("Canonical host-binding identity"),
                 "spec 19 matrix must include the host-admission split");
         assertTrue(
-                content.contains("MUST NOT import `p.studio.compiler.pbs`"),
+                content.contains("MUST NOT depend on types from the PBS frontend module"),
-                "spec 19 must forbid PBS imports in platform validators");
+                "spec 19 must forbid PBS frontend module types in platform validators");
+        assertTrue(
+                content.contains("`p.studio.compiler.pbs` is not the complete boundary"),
+                "spec 19 must not treat package p.studio.compiler.pbs as the complete PBS boundary");
     }
 
     @Test

prometeu-lsp/prometeu-lsp-v1/build.gradle.kts

@@ -7,7 +7,6 @@ dependencies {
     implementation(project(":prometeu-compiler:prometeu-compiler-core"))
     implementation(project(":prometeu-compiler:prometeu-frontend-api"))
     implementation(project(":prometeu-compiler:prometeu-build-pipeline"))
-    implementation(project(":prometeu-compiler:frontends:prometeu-frontend-pbs"))
     implementation(project(":prometeu-compiler:prometeu-frontend-registry"))
     implementation(project(":prometeu-compiler:prometeu-deps"))
     implementation(libs.lsp4j)

prometeu-studio/build.gradle.kts

@@ -14,7 +14,6 @@ dependencies {
     implementation(libs.javafx.controls)
     implementation(libs.javafx.fxml)
     implementation(libs.richtextfx)
-    testImplementation(project(":prometeu-compiler:frontends:prometeu-frontend-pbs"))
     testImplementation(project(":prometeu-packer:prometeu-packer-v1"))
 }
 

settings.gradle.kts

@@ -22,3 +22,5 @@ include("prometeu-compiler:prometeu-frontend-registry")
 include("prometeu-studio")
 
 include("prometeu-app")
+
+include("prometeu-architecture-tests")