fix(agent-core-v2): skip stray non-directory entries during session index scans

[sailist]

Related Issue

No linked issue — the bug was reported directly from a Canary build.

Problem

Recent sessions disappeared from the session list when the sessions directory contained any stray non-directory entry (e.g. a .DS_Store file or a legacy workspace.json file left by an old version). The session index scan stats <entry>/state.json for every entry under a workspace's sessions directory; for a plain file that stat fails with ENOTDIR, which surfaced as a generic storage.io_failed ("unrecognized I/O error") and aborted the whole index re-projection. The index then stayed on its previous generation, so all recent sessions vanished from the list, and the error message gave no hint about the real cause.

What changed

• The per-entry mtime stat in the session index source now treats an ENOTDIR failure the same as ENOENT: the entry is not a session directory, so it is skipped instead of failing the entire scan. Genuine I/O errors (EIO, EMFILE, ...) still propagate.
• Skipped entries are logged with a warn message that includes the offending path, so future failures point at the concrete bad entry.
• The logger is threaded from the session index service and projector into the scan; the shared storage contract is unchanged (ENOTDIR semantics for other consumers are untouched).
• Added a regression test that places stray files and a state-less directory in the sessions tree and proves the projection still publishes a new generation with the bad entries skipped (it fails before the fix); removed one duplicate legacy-path test case to keep the test count net-neutral.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue (external PRs: the issue must have a maintainer's /approve).
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 11ecb54

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: 11ecb54