Adds companion-memory, a local-first Codex relationship memory plugin/skill bundle.\n\nHighlights:\n- MCP stdio tools for persona and relationship memory operations\n- SQLite local storage with FTS5 and lightweight vector recall\n- Sensitive memories hidden from normal recall by default\n- Dry-run forgetting and soft delete\n- No external service required\n\nNote: this is listed as an external repo because the full capability includes a Codex plugin, MCP server, skill, and local SQLite service rather than a standalone SKILL.md-only folder.