memories-mcp: hide dot paths from list, read, and search

[jif-oai]

Why

The local memories root can contain implementation details such as .git plus incidental OS metadata like .DS_Store. Those entries are not authored memory content, so the memories MCP should keep them invisible instead of exposing them through normal discovery or direct lookup.

Only for local implementation ofc

What changed

• Return NotFound for scoped list, read, and search requests that include a hidden path component.
• Skip hidden files and directories while listing a directory or recursively searching the memories tree.
• Add regression coverage for hidden files, hidden directories, and hidden scoped requests across list, read, and search.

Testing

• Added focused regression tests in memories/mcp/src/local_tests.rs covering hidden-path behavior across the affected APIs.

[jif-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

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