Add official optional skill for qmd (tobi/qmd), a local on-device
search engine for personal knowledge bases, notes, docs, and meeting
transcripts.
Covers:
- Installation and setup for macOS and Linux
- Collection management and context annotations
- All search modes: BM25, vector, hybrid with reranking
- MCP integration (stdio and HTTP daemon modes)
- Structured query patterns and best practices
- systemd/launchd service configs for daemon persistence
Placed in optional-skills/ due to heavyweight requirements
(Node >= 22, ~2GB local models).
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