implements PLN-0103

discussion/index.ndjson

@@ -10,7 +10,7 @@
 {"type":"discussion","id":"DSC-0057","status":"open","ticket":"multi-frontend-frontend-backend-contract","title":"Estabilizar contrato entre frontend e backend comum","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","compiler-pbs","ir","backend","multi-frontend"],"agendas":[{"id":"AGD-0060","file":"AGD-0060-multi-frontend-frontend-backend-contract.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0056","status":"open","ticket":"multi-frontend-remove-pbs-branches","title":"Remover verificacoes explicitas de PBS do codigo comum","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","compiler-pbs","studio","frontend","coupling","multi-frontend"],"agendas":[{"id":"AGD-0059","file":"AGD-0059-multi-frontend-remove-pbs-branches.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0055","status":"open","ticket":"multi-frontend-compiler-vs-language-services","title":"Separar compilacao de servicos editoriais de frontend","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","studio","lsp","editor","frontend","multi-frontend"],"agendas":[{"id":"AGD-0058","file":"AGD-0058-multi-frontend-compiler-vs-language-services.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
-{"type":"discussion","id":"DSC-0054","status":"in_progress","ticket":"multi-frontend-provider-contract","title":"Introduzir provider completo de frontend","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","studio","frontend","registry","multi-frontend"],"agendas":[{"id":"AGD-0057","file":"AGD-0057-multi-frontend-provider-contract.md","status":"accepted","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[{"id":"DEC-0040","file":"DEC-0040-frontendprovider-explicito-como-contrato-de-frontend.md","status":"accepted","created_at":"2026-07-15","updated_at":"2026-07-15","ref_agenda":"AGD-0057"}],"plans":[{"id":"PLN-0103","file":"PLN-0103-specify-frontend-provider-and-registry-contract.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0104","file":"PLN-0104-introduce-frontendprovider-registry-api.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0105","file":"PLN-0105-wrap-pbs-frontend-as-explicit-provider.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0106","file":"PLN-0106-migrate-common-consumers-to-provider-lookup.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]}],"lessons":[]}
+{"type":"discussion","id":"DSC-0054","status":"in_progress","ticket":"multi-frontend-provider-contract","title":"Introduzir provider completo de frontend","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["compiler","compiler-general","studio","frontend","registry","multi-frontend"],"agendas":[{"id":"AGD-0057","file":"AGD-0057-multi-frontend-provider-contract.md","status":"accepted","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[{"id":"DEC-0040","file":"DEC-0040-frontendprovider-explicito-como-contrato-de-frontend.md","status":"accepted","created_at":"2026-07-15","updated_at":"2026-07-15","ref_agenda":"AGD-0057"}],"plans":[{"id":"PLN-0103","file":"PLN-0103-specify-frontend-provider-and-registry-contract.md","status":"done","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0104","file":"PLN-0104-introduce-frontendprovider-registry-api.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0105","file":"PLN-0105-wrap-pbs-frontend-as-explicit-provider.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]},{"id":"PLN-0106","file":"PLN-0106-migrate-common-consumers-to-provider-lookup.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15","ref_decisions":["DEC-0040"]}],"lessons":[]}
 {"type":"discussion","id":"DSC-0053","status":"open","ticket":"pbs-lsp-call-and-type-hierarchy","title":"PBS LSP Call and Type Hierarchy","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["studio","lsp","vscode","compiler-pbs","editor","call-hierarchy","type-hierarchy"],"agendas":[{"id":"AGD-0056","file":"AGD-0056-pbs-lsp-call-and-type-hierarchy.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0052","status":"open","ticket":"pbs-lsp-document-links","title":"PBS LSP Document Links","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["studio","lsp","vscode","compiler-pbs","editor","document-links","imports"],"agendas":[{"id":"AGD-0055","file":"AGD-0055-pbs-lsp-document-links.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0051","status":"open","ticket":"pbs-lsp-diagnostics-ux","title":"PBS LSP Diagnostics UX","created_at":"2026-07-15","updated_at":"2026-07-15","tags":["studio","lsp","vscode","compiler-pbs","editor","diagnostics","ux"],"agendas":[{"id":"AGD-0054","file":"AGD-0054-pbs-lsp-diagnostics-ux.md","status":"open","created_at":"2026-07-15","updated_at":"2026-07-15"}],"decisions":[],"plans":[],"lessons":[]}

discussion/workflow/plans/PLN-0103-specify-frontend-provider-and-registry-contract.md

@@ -2,7 +2,7 @@
 id: PLN-0103
 ticket: multi-frontend-provider-contract
 title: Specify frontend provider and registry contract
-status: open
+status: done
 created: 2026-07-15
 ref_decisions: [DEC-0040]
 tags: [compiler, compiler-general, studio, frontend, registry, multi-frontend]

docs/specs/compiler/23. Compiler Pipeline Entry Points Specification.md

@@ -14,6 +14,7 @@ Its purpose is to make the compiler usable through explicit entrypoints instead
 This document defines:
 
 - the canonical stage order shared by compiler entrypoints,
+- the frontend provider and registry boundary used by shared compiler composition,
 - the terminal stage and mandatory behavior of `analyze`,
 - the terminal stage and mandatory behavior of `compile`,
 - the terminal stage and mandatory behavior of `build`,
@@ -25,6 +26,7 @@ This document does not define:
 - one mandatory Java class or package layout,
 - editor-specific source providers or document-session providers,
 - frontend-specific semantic facts beyond the minimum shared `AnalysisSnapshot` contract,
+- dynamic frontend plugin discovery,
 - or one mandatory CLI architecture.
 
 ## 3. Authority and Precedence
@@ -229,6 +231,26 @@ This authority model MUST NOT:
 2. move semantic inline hint policy into LSP,
 3. or imply that the host editor may synthesize semantic hints when the frontend did not publish them.
 
+## 8.3 Frontend Provider and Registry Contract
+
+The shared compiler composition surface MUST represent each registered frontend through a `FrontendProvider` or equivalent provider contract.
+
+At minimum, each provider MUST expose:
+
+1. `specification()`, returning the frontend-owned static contract, including its stable `languageId`;
+2. `compiler()`, returning the compiler-facing frontend service used by the shared build pipeline;
+3. `languageService()`, returning an optional editor-facing language-service capability for tooling consumers.
+
+`languageService()` MUST be optional. A frontend that supports compilation but does not provide editor services MUST remain a valid provider.
+
+The frontend registry MUST resolve providers by `languageId`. A lookup for an unknown `languageId` MUST fail explicitly with a diagnostic-friendly error. Unknown languages MUST NOT silently fall back to PBS or to any other frontend.
+
+Common compiler, build pipeline, and Studio-facing consumers MUST obtain frontend behavior through provider lookup. They MUST NOT directly instantiate frontend-specific compiler services, except inside the frontend provider itself or inside an approved application composition root.
+
+Provider registration MUST be explicit in v1. The registry contract MUST NOT use dynamic plugin discovery, reflection-based discovery, classpath scanning, external JAR loading, or runtime plugin installation to discover frontends.
+
+PBS is the only initial real provider for this contract. PBS MAY be registered by an application composition root, but PBS MUST NOT become an exclusive semantic owner of the shared compiler pipeline.
+
 ## 9. Public Surface Rule
 
 The shared compiler public surface MUST expose explicit entrypoints equivalent in meaning to: