[config] v1.3 config fields, state file extension, new deps

[Obsidian68]

Summary

• Bump version to 1.3.0 in __init__.py and pyproject.toml
• Add 4 new Settings fields: watcher_enabled (True), watcher_debounce_ms (2000), mcp_enabled (True), mcp_path ("/mcp")
• Extend _write_state() with last_indexed: str | None = None — backward compatible, existing call sites unchanged
• Add fastmcp>=2.0.0 and watchfiles>=0.21.0 dependencies
• Add 4 new env vars to .env.example
• Add config tests for new field defaults and env overrides
• Add CLI tests for last_indexed round-trip and backward compatibility

Test plan

• 283 tests pass, 92.65% coverage (threshold: 90%)
• Ruff lint: clean
• Ruff format: clean
• Zero TODOs, dead code, hardcoded secrets
• New config fields load with correct defaults
• New config fields override from environment
• last_indexed round-trips through state file
• State files without last_indexed still work (backward compat)

Known limitations

• watcher_enabled, watcher_debounce_ms, mcp_enabled, mcp_path are accepted but unused — implementation comes in feat/mcp-server and feat/file-watcher branches
• last_indexed in state file is written but not yet consumed — feat/file-watcher will use it for incremental vault scanning
• uv.lock was auto-updated by uv sync to include fastmcp and watchfiles transitive dependencies

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[chatgpt-codex-connector]

Update API version constants to 1.3.0

This commit bumps __version__ to 1.3.0, but the REST API metadata and health payload still report 1.2.0 (src/engram/interfaces/rest/app.py:33, src/engram/interfaces/rest/health.py:35), so after upgrading, clients that read /health or OpenAPI version fields will see a stale version and can make incorrect compatibility decisions. Please keep all externally reported version strings in sync with the package version bump.

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