Reorganize cognitive-memory skill: consolidate scripts, systemd, dev subdirs
- Move session_memory.py, ensure-symlinks.sh into skills/cognitive-memory/scripts/
- Copy systemd units into skills/cognitive-memory/systemd/ with README
- Move PROJECT_PLAN.json, migrate.py into skills/cognitive-memory/dev/
- Add mtime-based embeddings cache to client.py (6x faster semantic recall)
- Default recall to semantic+keyword merge (was keyword-only)
- Update settings.json SessionEnd hook path, MCP allow entry
- Update SKILL.md, feature.json, mcp_server.py docs for new defaults
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
f0f075461e