handle read errors more gracefu

[TylerLeonhardt]

Fixes microsoft/vscode#288303

[Copilot]

Pull request overview

This PR adjusts how Claude code sessions handle directory read failures so that missing session directories are treated gracefully while still exposing unexpected filesystem errors. It adds targeted unit tests and refactors directory reading into a shared helper used by both cache validation and disk loading.

Changes:

• Introduced a _tryReadDirectory helper in ClaudeCodeSessionService to centralize handling of FileNotFound, DirectoryNotFound, and ENOENT directory read errors by returning an empty entry list.
• Updated cache validation and disk-loading logic to use _tryReadDirectory and treat empty/missing directories as having no sessions, rather than logging errors.
• Added directory read error handling tests to claudeCodeSessionService.spec.ts to verify graceful handling of known “not found” errors and propagation of unexpected errors during directory reads.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/extension/agents/claude/node/claudeCodeSessionService.ts	Refactors directory reading into _tryReadDirectory and updates cache/disk-loading paths to treat missing directories as empty while logging unexpected read failures.
src/extension/agents/claude/node/test/claudeCodeSessionService.spec.ts	Adds tests covering ENOENT/FileNotFound/DirectoryNotFound behavior and expecting propagation for unexpected directory read errors (e.g., EACCES).