diff --git a/discussion/index.ndjson b/discussion/index.ndjson
index 9a497be0..2b036e95 100644
--- a/discussion/index.ndjson
+++ b/discussion/index.ndjson
@@ -11,4 +11,4 @@
 {"type":"discussion","id":"DSC-0010","status":"done","ticket":"studio-code-editor-workspace-foundations","title":"Establish Code Editor workspace foundations in Studio without LSP","created_at":"2026-03-30","updated_at":"2026-03-31","tags":["studio","editor","workspace","multi-frontend","lsp-deferred"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0026","file":"discussion/lessons/DSC-0010-studio-code-editor-workspace-foundations/LSN-0026-read-only-editor-foundations-and-semantic-deferral.md","status":"done","created_at":"2026-03-31","updated_at":"2026-03-31"}]}
 {"type":"discussion","id":"DSC-0011","status":"done","ticket":"compiler-analyze-compile-build-pipeline-split","title":"Split compiler pipeline into analyze, compile, and build entrypoints","created_at":"2026-03-30","updated_at":"2026-03-30","tags":["compiler","pipeline","artifacts","build","analysis"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0025","file":"discussion/lessons/DSC-0011-compiler-analyze-compile-build-pipeline-split/LSN-0025-compiler-pipeline-entrypoints-and-result-boundaries.md","status":"done","created_at":"2026-03-30","updated_at":"2026-03-30"}]}
 {"type":"discussion","id":"DSC-0012","status":"done","ticket":"studio-editor-document-vfs-boundary","title":"Definir um boundary de VFS documental para tree/view/open files no Code Editor do Studio","created_at":"2026-03-31","updated_at":"2026-03-31","tags":["studio","editor","workspace","vfs","filesystem","boundary"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0027","file":"discussion/lessons/DSC-0012-studio-editor-document-vfs-boundary/LSN-0027-project-document-vfs-and-session-owned-editor-boundary.md","status":"done","created_at":"2026-03-31","updated_at":"2026-03-31"}]}
-{"type":"discussion","id":"DSC-0013","status":"open","ticket":"studio-editor-write-wave-supported-non-frontend-files","title":"Definir a wave inicial de edicao no Code Editor apenas para arquivos aceitos e nao relacionados ao FE","created_at":"2026-03-31","updated_at":"2026-03-31","tags":["studio","editor","workspace","write","read-only","vfs","frontend-boundary"],"agendas":[{"id":"AGD-0013","file":"AGD-0013-studio-editor-write-wave-supported-non-frontend-files.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31"},{"id":"AGD-0014","file":"AGD-0014-studio-editor-frontend-edit-rights.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31"}],"decisions":[{"id":"DEC-0010","file":"DEC-0010-studio-controlled-non-frontend-editor-write-wave.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31","ref_agenda":"AGD-0013"},{"id":"DEC-0011","file":"DEC-0011-studio-frontend-read-only-minimum-lsp-phase.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31","ref_agenda":"AGD-0014"}],"plans":[{"id":"PLN-0019","file":"PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0020","file":"PLN-0020-build-dec-0010-vfs-access-policy-and-save-core.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0021","file":"PLN-0021-integrate-dec-0010-editor-write-ui-and-workflow.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0022","file":"PLN-0022-propagate-dec-0011-into-studio-vfs-and-lsp-specs.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0023","file":"PLN-0023-scaffold-flat-packed-prometeu-lsp-api-and-session-seams.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0024","file":"PLN-0024-implement-read-only-fe-diagnostics-symbols-and-definition.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0025","file":"PLN-0025-implement-fe-semantic-highlight-consumption.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]}],"lessons":[]}
+{"type":"discussion","id":"DSC-0013","status":"open","ticket":"studio-editor-write-wave-supported-non-frontend-files","title":"Definir a wave inicial de edicao no Code Editor apenas para arquivos aceitos e nao relacionados ao FE","created_at":"2026-03-31","updated_at":"2026-03-31","tags":["studio","editor","workspace","write","read-only","vfs","frontend-boundary"],"agendas":[{"id":"AGD-0013","file":"AGD-0013-studio-editor-write-wave-supported-non-frontend-files.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31"},{"id":"AGD-0014","file":"AGD-0014-studio-editor-frontend-edit-rights.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31"}],"decisions":[{"id":"DEC-0010","file":"DEC-0010-studio-controlled-non-frontend-editor-write-wave.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31","ref_agenda":"AGD-0013"},{"id":"DEC-0011","file":"DEC-0011-studio-frontend-read-only-minimum-lsp-phase.md","status":"accepted","created_at":"2026-03-31","updated_at":"2026-03-31","ref_agenda":"AGD-0014"}],"plans":[{"id":"PLN-0019","file":"PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md","status":"done","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0020","file":"PLN-0020-build-dec-0010-vfs-access-policy-and-save-core.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0021","file":"PLN-0021-integrate-dec-0010-editor-write-ui-and-workflow.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0010"]},{"id":"PLN-0022","file":"PLN-0022-propagate-dec-0011-into-studio-vfs-and-lsp-specs.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0023","file":"PLN-0023-scaffold-flat-packed-prometeu-lsp-api-and-session-seams.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0024","file":"PLN-0024-implement-read-only-fe-diagnostics-symbols-and-definition.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]},{"id":"PLN-0025","file":"PLN-0025-implement-fe-semantic-highlight-consumption.md","status":"review","created_at":"2026-03-31","updated_at":"2026-03-31","ref_decisions":["DEC-0011"]}],"lessons":[]}
diff --git a/discussion/workflow/plans/PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md b/discussion/workflow/plans/PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md
index 3827ea84..d9d48420 100644
--- a/discussion/workflow/plans/PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md
+++ b/discussion/workflow/plans/PLN-0019-propagate-dec-0010-into-studio-and-vfs-specs.md
@@ -2,9 +2,9 @@
 id: PLN-0019
 ticket: studio-editor-write-wave-supported-non-frontend-files
 title: Propagate DEC-0010 into Studio editor and VFS specs
-status: review
+status: done
 created: 2026-03-31
-completed:
+completed: 2026-03-31
 tags: [studio, editor, vfs, specs, write-wave]
 ---
 
diff --git a/docs/specs/studio/1. Studio Shell and Workspace Layout Specification.md b/docs/specs/studio/1. Studio Shell and Workspace Layout Specification.md
index 19b415c1..e8751292 100644
--- a/docs/specs/studio/1. Studio Shell and Workspace Layout Specification.md	
+++ b/docs/specs/studio/1. Studio Shell and Workspace Layout Specification.md	
@@ -70,7 +70,7 @@ Baseline workspace architecture rules are:
 The shell must not encourage a workspace model where every interaction falls back to whole-workspace refresh.
 
 Detailed local workspace composition remains workspace-owned.
-For example, `Code Editor`-local layout, navigator behavior, tab rules, passive placeholder surfaces, and read-only file behavior are not shell-global rules and must be defined by the workspace-local editor specification.
+For example, `Code Editor`-local layout, navigator behavior, tab rules, passive placeholder surfaces, document access-mode behavior, and editor-local save surfaces are not shell-global rules and must be defined by the workspace-local editor specification.
 
 Project-session boundaries may still exist above a workspace when the state must remain alive while the project window stays open.
 
diff --git a/docs/specs/studio/5. Code Editor Workspace Specification.md b/docs/specs/studio/5. Code Editor Workspace Specification.md
index 0c8a9134..295f569c 100644
--- a/docs/specs/studio/5. Code Editor Workspace Specification.md	
+++ b/docs/specs/studio/5. Code Editor Workspace Specification.md	
@@ -8,7 +8,7 @@ Active
 
 - `prometeu-studio`
 - the Studio `Code Editor` workspace
-- the first read-only editor workspace wave
+- the first controlled editor write wave for supported non-frontend documents
 
 ## Purpose
 
@@ -18,10 +18,11 @@ This specification stabilizes:
 
 - the baseline visual composition of the workspace,
 - the `Project Navigator` role and scope,
-- the read-only file-opening model,
+- the mixed editable and hard `read-only` file-opening model,
 - the responsive tab baseline,
 - the passive `Outline`, helper, and status-bar surfaces,
-- and the explicit deferral of write and semantic/LSP behavior.
+- the editor-local save surfaces,
+- and the explicit deferral of semantic/LSP behavior.
 
 ## Authority and Precedence
 
@@ -39,14 +40,16 @@ If this document conflicts with the global Studio shell specifications, the shel
 The `Code Editor` workspace must assume:
 
 - the Studio shell already mounts `Code Editor` as a baseline workspace,
-- the current wave is read-only,
+- the current wave allows editing only for the supported non-frontend document classes classified by `prometeu-vfs` as editable,
+- frontend-scoped supported documents remain hard `read-only`,
 - all project files remain visible in the editor workspace even when only some are frontend-relevant,
 - `prometeu.json` plus the selected frontend may identify source roots worth tagging,
 - future semantic providers such as LSP may arrive later,
-- and the current wave must not depend on write/save or semantic behavior to remain coherent.
+- and the current wave must not depend on semantic behavior to remain coherent.
 
 This workspace may consume Studio project metadata and Studio-owned workspace framework primitives, but it must not infer a semantic-provider contract beyond keeping the path open for later integration.
 This workspace must consume project tree and document data through `prometeu-vfs` rather than through editor-owned direct filesystem readers.
+This workspace must consume document access policy and save capability from `prometeu-vfs` rather than rederiving editability locally.
 
 ## Workspace Model
 
@@ -54,7 +57,7 @@ The `Code Editor` workspace is:
 
 - project-aware,
 - file-oriented,
-- read-only in this first wave,
+- mixed-mode in this wave, with editable supported non-frontend documents and hard `read-only` frontend documents,
 - and explicitly not a semantic IDE surface yet.
 
 The workspace must help the user:
@@ -62,13 +65,12 @@ The workspace must help the user:
 - see the full project tree,
 - identify frontend-relevant source roots visually,
 - open supported files into editor tabs,
+- save editable non-frontend documents through editor-local commands,
 - understand the active file context,
 - and understand that semantic/editor-automation features are not part of this wave.
 
 The workspace must not pretend to offer:
 
-- save/write behavior,
-- dirty state,
 - merge behavior,
 - active outline semantics,
 - or LSP-backed coding assistance.
@@ -89,8 +91,9 @@ The left editor column must be a vertical stack containing:
 
 The central editor work area must contain:
 
+- a top command bar containing at least `Save` and `Save All`,
 - a tab strip at the top,
-- and the read-only editor body below it.
+- and the editor body below it.
 
 The lower helper region is present in this wave only as a passive placeholder.
 
@@ -153,6 +156,7 @@ Rules:
 - Selecting a supported file that is not already open must open it in a new tab.
 - File opening must resolve document content through `prometeu-vfs`.
 - The editor must maintain opened-file content in memory for the active Studio session only.
+- Frontend-scoped supported documents may coexist in tabs with editable non-frontend documents.
 - The tab strip must be responsive rather than fixed to one hardcoded tab count.
 - Overflow tabs must remain accessible through an IntelliJ-style overflow control.
 - The active tab must remain visible.
@@ -166,16 +170,21 @@ The first wave must not define:
 - split editors,
 - or cross-session tab restoration.
 
-## Read-only File Model
+## Access-Mode and Save Model
 
-The first `Code Editor` wave is read-only.
+The first `Code Editor` write wave is controlled rather than universally editable.
 
 Rules:
 
-- supported files may be opened into read-only in-memory buffers,
-- the workspace must not write files,
-- the workspace must not expose save behavior,
-- the workspace must not define dirty tracking,
+- the workspace must treat `prometeu-vfs` as the canonical source of document access mode for supported files;
+- the workspace must not infer frontend scope from path heuristics, local UI state, or ad hoc extension checks;
+- supported frontend-scoped documents must remain hard `read-only`;
+- editable scope is limited to the supported non-frontend textual classes exposed by `prometeu-vfs` for this wave;
+- the workspace must not allow local editorial mutation for hard `read-only` frontend documents;
+- the workspace must expose save behavior only through an editor-local command bar containing at least `Save` and `Save All`;
+- the global shell `Save` menu item must not be the save surface for this wave;
+- save intent must route through `prometeu-vfs`, which remains the owner of persistence policy;
+- a frontend hard `read-only` tab must show a top warning that the file cannot be edited or saved in this wave;
 - and the workspace must not define local merge/conflict behavior against disk changes.
 
 ## Outline Rules
@@ -194,7 +203,7 @@ Rules:
 
 ## Status Bar Rules
 
-The status bar must remain passive in this wave.
+The status bar must remain mostly passive in this wave.
 
 Its left side must show the breadcrumb path of the active file, such as `proj > src > file.pbs`.
 
@@ -204,12 +213,14 @@ Its right side must show:
 - line separator,
 - tabs/spaces mode,
 - file extension or language,
-- and a read-only lock icon.
+- and access-mode state.
 
 For this wave:
 
 - `L:C` may remain a visual placeholder,
-- and the read-only lock icon is visual only and does not imply file-permission enforcement.
+- editable non-frontend documents may show their current file-type state without implying build participation,
+- hard `read-only` frontend documents must show an explicit `read-only` state,
+- and the status-bar `read-only` surface should be shaped so it can evolve into a per-file toggle later without requiring a model rewrite.
 
 ## Session State Rules
 
@@ -227,14 +238,17 @@ The following remain outside editor-owned session state:
 - project-session ownership of `prometeu-vfs`,
 - structural project-tree data returned by `prometeu-vfs`,
 - support classification rules,
-- and document loading responsibilities.
+- document loading responsibilities,
+- save persistence policy,
+- and build-facing document ownership.
+
+Editable documents may have session-local editorial snapshots while the project session remains open.
+Those snapshots are editorial only and must not be treated as canonical build input by implication.
 
 Persisting that state across Studio executions is deferred.
 
 ## Non-Goals
 
-- write/save behavior
-- dirty tracking
 - merge/conflict resolution
 - watcher-driven automatic refresh
 - public `prometeu-vfs` event APIs
@@ -244,12 +258,16 @@ Persisting that state across Studio executions is deferred.
 - LSP integration details
 - autocomplete, go-to-definition, symbols, rename, code actions, or semantic diagnostics while typing
 - a normative editor event contract in this wave
+- frontend editing
+- any implication that editor-owned in-memory snapshots participate in the build
 
 ## Exit Criteria
 
 This specification is complete enough when:
 
-- the read-only first-wave scope is unambiguous,
+- the controlled write-wave scope is unambiguous,
 - the `Project Navigator` and tab responsibilities are explicit,
+- editor-local `Save` and `Save All` are part of the normative workspace contract,
+- hard frontend `read-only` behavior is explicit in both warning and status-bar surfaces,
 - placeholder versus functional regions are clearly separated,
-- and deferred write/semantic/LSP behavior is clearly outside the first-wave contract.
+- and deferred semantic/LSP behavior is clearly outside the current contract.
diff --git a/docs/specs/studio/6. Project Document VFS Specification.md b/docs/specs/studio/6. Project Document VFS Specification.md
index f526f5da..dd2feaaf 100644
--- a/docs/specs/studio/6. Project Document VFS Specification.md	
+++ b/docs/specs/studio/6. Project Document VFS Specification.md	
@@ -8,7 +8,7 @@ Active
 
 - `prometeu-vfs`
 - `prometeu-studio`
-- the Studio project-document boundary for the first Code Editor migration wave
+- the Studio project-document boundary for the first controlled Code Editor write wave
 
 ## Purpose
 
@@ -20,6 +20,8 @@ This specification stabilizes:
 - project-session ownership,
 - the filesystem-backed first-wave contract,
 - structural tree and document access responsibilities,
+- canonical frontend scope and access policy ownership,
+- editorial snapshot and save ownership for editable non-frontend documents,
 - the RPC-first public API baseline,
 - and explicit first-wave exclusions such as public event publication and watchers.
 
@@ -47,7 +49,7 @@ If this document conflicts with shell-wide Studio rules, the shell specification
 
 - watcher-driven refresh in this wave,
 - public event API exposure in this wave,
-- write or save semantics,
+- build participation for editorial snapshots by implication,
 - or ownership over non-Studio domains such as packer assets.
 
 ## Module Role
@@ -58,6 +60,8 @@ If this document conflicts with shell-wide Studio rules, the shell specification
 - the owner of project structural tree data for the covered scope,
 - the owner of project document resolution for the covered scope,
 - the owner of file support and unsupported-file classification for the covered scope,
+- the owner of document access policy for the covered scope,
+- the owner of save persistence for editable documents in this wave,
 - and the required path through which Studio accesses project-document filesystem state in this wave.
 
 `prometeu-vfs` is not:
@@ -119,8 +123,36 @@ Rules:
 
 - opening a supported file in the Code Editor must go through `prometeu-vfs`;
 - the returned document content must describe only project-session document state for the opened project;
-- this wave must not add save, dirty tracking, merge, or conflict semantics by implication;
-- future in-memory overlays may be added only by later explicit decision.
+- `prometeu-vfs` must classify each supported document as at least editable or hard `read-only`;
+- unsupported documents must remain distinguishable from supported `read-only` and supported editable documents;
+- `prometeu-vfs` must own editable in-memory editorial snapshots for the current Studio session;
+- save operations for editable documents in this wave must persist those editorial snapshots to disk through `prometeu-vfs`;
+- Studio consumers must treat `prometeu-vfs` access policy as canonical rather than rederiving editability locally;
+- and editorial snapshots must remain outside build-facing document state.
+
+## Frontend Scope Contract
+
+Frontend scope must be decided canonically inside `prometeu-vfs`.
+
+Rules:
+
+- `FrontendSpec.allowedExtensions` is the source of truth for frontend scope in this wave;
+- the VFS document contract must expose a canonical frontend-compatible `typeId` or equivalent scope marker derived from that source of truth;
+- consumers must not infer frontend scope from raw dynamic language identifiers, path heuristics, or local UI extension checks;
+- frontend-scoped supported documents must remain hard `read-only` in this wave;
+- the initial editable non-frontend set is limited to the currently supported textual classes represented as `text`, `json`, `ndjson`, and `bash`;
+- and no additional editable class may be inferred by implementation convenience during this wave.
+
+## Document Access Context
+
+`prometeu-vfs` must reserve a single access-context entity for document-access-related values.
+
+Rules:
+
+- the access-context entity may remain session-local in this wave;
+- it must already support lookup and mutation under current demand;
+- future persistence may be added later without redesigning the access model;
+- and the current reservation must not be treated as authorization for build participation or broader product-wide state ownership.
 
 ## Support and Plugin Rules
 
@@ -169,11 +201,12 @@ Rules:
 
 - public event publication
 - watcher-driven refresh
-- write or save behavior
 - dirty tracking
 - merge or conflict handling
 - non-project content snapshots
 - a generic product-wide filesystem abstraction
+- frontend editing
+- treating editorial snapshots as canonical build input
 
 ## Exit Criteria
 
@@ -182,5 +215,7 @@ This specification is complete enough when:
 - `prometeu-vfs` ownership is clearly separated from shell and workspace UI ownership,
 - the project-session lifecycle rule is unambiguous,
 - the structural tree contract is explicitly non-visual,
+- frontend scope and access policy ownership are explicit,
+- editable non-frontend snapshot and save ownership are explicit,
 - the RPC-first public API rule is explicit,
 - and deferred public events and watchers are clearly out of scope.
diff --git a/docs/specs/studio/README.md b/docs/specs/studio/README.md
index 58f779f0..9b6d380a 100644
--- a/docs/specs/studio/README.md
+++ b/docs/specs/studio/README.md
@@ -41,7 +41,7 @@ Specs should normally be fed by:
 
 1. agendas that frame the open Studio topic,
 2. decisions that close the product or interaction choice,
-3. pull-request plans that define propagation,
+3. plans that define propagation,
 4. then spec integration.
 
 If a spec edit would require guessing unresolved UI behavior, stop and surface the missing decision first.
@@ -64,6 +64,17 @@ Recommended order:
 1. shell and workspace layout;
 2. shared UI foundations;
 3. components module policy;
-4. project document VFS boundary;
-5. assets workspace behavior;
+4. assets workspace behavior;
+5. project document VFS boundary;
 6. code editor workspace behavior.
+
+## Current Wave Notes
+
+The current `Code Editor` wave is not globally read-only anymore.
+
+Normative reminders:
+
+- editable scope is limited to supported non-frontend textual documents classified by `prometeu-vfs`;
+- frontend-scoped supported documents remain hard `read-only`;
+- the editor-local `Save` and `Save All` surfaces belong to the `Code Editor` workspace rather than the shell;
+- editorial in-memory snapshots remain outside build-facing state.