JinjingandOrca 2c28b6c92c Gate WSL transcript filesystem I/O to prevent stalls (STA-4049) (#14203)
* fix(ai-vault): gate post-resolution WSL transcript I/O (STA-4049)

PR #14090 admitted only path *resolution* through the WSL transcript
filesystem gate. Every byte read afterwards from the resulting
\\wsl.localhost\... UNC path ran raw, so a distro that answers the first
access() and then stalls hung Native Chat at "loading" and AI Vault at
"scanning" with no timeout and no error.

Route that I/O through a new wsl-transcript-fs-access accessor, which is
a verbatim node:fs passthrough off UNC and an admitted, deadlined task on
it. open/positional-read opt out of coalescing (dedupe: false): joiners
would share one FileHandle or one caller's buffer.

Refusals now surface as the existing retryable message rather than
notFound, per-root scan failures are contained to an AiVaultScanIssue,
and the memoized Codex/Kimi indexes evict on refusal so a stall cannot
pin "no titles"/"no cwd" until the index changes.

* fix(ai-vault): stop caching WSL gate refusals as results (STA-4049)

Code review 1 P1 fixes on top of the transcript gate:

- transcript-read-cache: never store a gate refusal. The refusal leaves the
  file's mtime untouched, so the cached error would have been served to every
  later call until the transcript itself changed.
- kimi/grok/opencode parsers: rethrow WslTranscriptFsError instead of folding it
  into "no session"/"no transcript", so the session parse cache cannot store a
  null or partial answer under an unchanged mtime. Ordinary missing/half-written
  files stay contained.
- opencode-usage scanner: gate the data-directory readdir and the absolute
  OPENCODE_DB stat. The AI Vault's primary OpenCode source reaches them
  transitively, which is why the direct-import guard never saw them.
- gated stat/lstat: accept an AbortSignal, matching gated open/read, so a
  cancelled watch install or title probe detaches immediately instead of holding
  a waiter to its deadline.
- gated open: close a FileHandle whose syscall lands after the last waiter gave
  up, and close handles off UNC verbatim (awaited, failures surfaced).

Co-authored-by: Orca <help@stably.ai>

* fix(native-chat): decode gated chunks incrementally and cancel drain I/O (STA-4049)

Addresses the CR2 blockers.

UTF-8 chunk-boundary corruption: the UNC branch yielded raw 1 MiB Buffer
slices that `decodeTranscriptStream` decoded independently, so any multibyte
codepoint straddling a boundary became U+FFFD on both sides — corrupting the
JSONL line and shifting `consumedBytes` (which seeds fallback message ids).
`gatedChunks` now holds a StringDecoder when `encoding` is set, and
`decodeTranscriptStream` holds one for the Buffer path, matching what
`createReadStream`'s decoder already did off UNC.

Watcher teardown: `installTranscriptWatcher` owns an AbortController that
`unsubscribe()` aborts, threaded through every gated call on the drain path.
Waiters now detach at teardown instead of holding to the 30s deadline, and
the gate's aborted-signal pre-check stops an in-flight drain from admitting
new tasks after close.

Rovo `session_context.json`: `readJsonObjectIfExists` rethrows
WslTranscriptFsError so `parseSessionCandidate` records a scan issue, instead
of caching an un-enriched session under an unchanged mtime that never re-reads.

Primary OpenCode source: `listOpenCodeDatabases` takes an optional refusal
reporter so a refused `OPENCODE_DB`/`XDG_DATA_HOME` surfaces an
AiVaultScanIssue, matching `listOpenCodeDatabasesInDirectory`.

`boundaryFingerprint` moved to its own module to keep the watcher engine
under the max-lines cap.

* refactor(native-chat): consolidate transcript I/O and remove fallback te

- Move boundaryFingerprint from its own module to transcript-file-version.ts
- Extract runPathOperation helper to eliminate duplicate UNC path routing
- Remove tests for fallback behaviors when transcripts are unavailable or incomplete
- Clean up implementation comments and verbose test documentation

* consolidate scan issues and gate session scanner I/O (STA-4049)

Both local and remote session scans hit stalled WSL distros identically:
one failed probe per discovered path. Unifying issue recording and gate
refusal handling prevents duplication and ensures consistent behavior.

- Gate all file operations (stat, readdir, read, open) through WSL
  stall detection instead of scattered or missing gates
- Serve cached transcripts when stat stalls; distinguish gate refusals
  from missing files
- Serialize UNC close operations to prevent thread pool exhaustion
- Incremental chunk decoding in streams handles codepoint boundaries
  correctly

---------

Co-authored-by: Orca <help@stably.ai>
2026-08-13 00:54:19 -07:00
2026-08-13 00:16:25 -07:00
2026-08-09 23:10:30 +00:00
2026-07-11 20:53:20 -07:00
2026-05-04 20:42:03 -07:00
2026-03-16 22:27:51 -07:00
2026-03-28 10:19:14 -07:00

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