Add ty-qmd extension for QMD search integration

[bborn]

Summary

This PR introduces ty-qmd, a new extension that integrates QMD (an on-device semantic search engine by @tobi) with TaskYou. QMD combines BM25 full-text search, vector semantic search, and LLM re-ranking - all running locally.

What this enables:

• Task history search - Completed tasks become searchable knowledge
• Project documentation indexing - Index markdown, meeting notes, docs alongside tasks
• MCP sidecar mode - Claude can query past work during task execution

Use case example:

Task: "Implement OAuth login"

Claude searches: "OAuth authentication implementation"
Finds: Task #42 "Add Google OAuth" - completed 2 weeks ago
Context: Used passport.js, stored tokens in Redis, added refresh logic

Commands

# Sync completed tasks to QMD
ty-qmd sync

# Search indexed content
ty-qmd search "authentication patterns"

# Run MCP server for Claude
ty-qmd serve

# Index project docs
ty-qmd index-project ~/Projects/myapp --mask "**/*.md"

# Check status
ty-qmd status

Architecture

┌─────────────────────────────────────────────────────────┐
│                  Task Execution Environment             │
│                                                         │
│   Claude ──MCP──▶ taskyou-mcp ──proxy──▶ qmd mcp       │
│                        │                   │           │
│                        │                   ▼           │
│                        │          ┌───────────────┐    │
│                        │          │  QMD Index    │    │
│                        │          │  - tasks      │    │
│                        │          │  - docs       │    │
│                        ▼          └───────────────┘    │
│                 ┌─────────────┐                        │
│                 │ TaskYou DB  │◀──── ty-qmd sync      │
│                 └─────────────┘                        │
└─────────────────────────────────────────────────────────┘

Files Added

File	Purpose
extensions/ty-qmd/README.md	User documentation
extensions/ty-qmd/DESIGN.md	Technical design and integration strategies
extensions/ty-qmd/cmd/main.go	CLI entry point (cobra)
extensions/ty-qmd/internal/qmd/qmd.go	QMD CLI wrapper
extensions/ty-qmd/internal/tasks/tasks.go	TaskYou DB access
extensions/ty-qmd/internal/exporter/exporter.go	Task → Markdown export
extensions/ty-qmd/config.example.yaml	Example configuration

Test plan

• Build extension: cd extensions/ty-qmd && go build -o ty-qmd ./cmd
• Install QMD: bun install -g github:tobi/qmd
• Verify sync: ty-qmd sync --all
• Verify search: ty-qmd search "some query"
• Verify MCP serve: ty-qmd serve

Future work (tracked in DESIGN.md)

• Pre-execution context injection
• Auto-sync daemon mode
• Project-specific collections
• TUI integration

🤖 Generated with Claude Code