fix(fs): address review — rename to dsh-fs-policy, fs/*-intent events, RFC currency, ENOTDIR

Rename per review naming decisions:
- package dsh-file-context → dsh-fs-policy (dir, package name, plugin name,
  tsconfig refs, importers, type-equiv manifest, generated catalog + module-graph)
- events fs/write-expectation → fs/write-intent, fs/edit-expectation → fs/edit-intent
  (fs/observed unchanged); type FsWriteExpectation → FsWriteIntent, "expectation"
  wording → "intent" throughout
- exported FileContextExec → FsPolicyExec

Make the implemented RFCs describe what shipped, not the superseded designs:
the 2026-06-17 capability-seam + tool-schemas RFCs no longer place policy on
ctx.fs or use full/partial-view authorization, and the fsspec RFC's ctx.fileContext
service prose is rewritten to the fs/* event-gate reality (freshness-based auth).
Sharpen docs/rfc/implemented/AGENTS.md: a rename is a fact to fix IN PLACE — the
"new RFC" escape hatch is for macro decision reversals only, not renames.

Code fixes from review:
- fsio.ts resolveLocalTarget/probe translate ENOTDIR (a parent path segment is a
  file) into the structured FsError taxonomy instead of leaking a raw Node error;
  resolve reports FS_NOT_FOUND, probe reports absent. Regression tests proven to
  fail on the unfixed code.
- tool-fs HMR test now asserts prompt sections (not just tool schemas) are
  withdrawn on disposal.
- fs/observed is a plain (unguarded) ctx.emit: correct the fs-policy comment,
  filesystem.md, and tool-fs module doc that wrongly claimed the tool "contains"
  a throwing listener; a throw surfaces as the tool's isError result.
- drop the false "loaded by the default product config" claim (no config wires
  the fs tools yet), the duplicate ctx.bash service-map row, the stale
  FileReadRequest catalog link-map entry, and the fs/fs README EOF blank line;
  correct the dsh-fs package.json description.

scripts/gen-cordis-catalog.ts

@@ -80,10 +80,9 @@ const LINK_MAP: Record<string, string> = {
   FsInfo: 'filesystem.md',
   FsTarget: 'filesystem.md',
   FsVersion: 'filesystem.md',
-  FsWriteExpectation: 'filesystem.md',
+  FsWriteIntent: 'filesystem.md',
   FsWriteOutcome: 'filesystem.md',
-  FileContextExec: 'filesystem.md',
-  FileReadRequest: 'filesystem.md',
+  FsPolicyExec: 'filesystem.md',
   FileReadOutcome: 'filesystem.md',
 }
 

scripts/type-equiv.manifest.json

@@ -46,12 +46,12 @@
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsTargetKey", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsVersion", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsInfo", "source": "packages/fs/fs/src/types.ts" },
-    { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsWriteExpectation", "source": "packages/fs/fs/src/types.ts" },
+    { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsWriteIntent", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsWriteOutcome", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsEditRequest", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsEditOutcome", "source": "packages/fs/fs/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsErrorCode", "source": "packages/fs/fs/src/types.ts" },
-    { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FileContextExec", "source": "packages/fs/file-context/src/types.ts" },
+    { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FsPolicyExec", "source": "packages/fs/fs-policy/src/types.ts" },
     { "doc": "docs/core-data-structures/filesystem.md", "symbol": "FileReadOutcome", "source": "packages/fs/tool-fs/src/read-render.ts" },
 
     { "doc": "docs/core-data-structures/compaction.md", "symbol": "CompactionResult", "source": "packages/compact/compact/src/types.ts" },