feat(server): agentic query API, daemon mode, and relay mode (#438)
## Summary
- **Agentic query API**: 11 JSON-RPC handlers over TCP for AI agent
integration — compileCommand, projectFiles, fileDeps, impactAnalysis,
symbolSearch, readSymbol, documentSymbols, definition, references,
callGraph, typeHierarchy
- **Daemon mode**: MasterServer listens on a unix domain socket,
accepting multiple agent connections (`--mode daemon`)
- **Relay mode**: Bidirectional stdin/stdout ↔ unix socket proxy for
editor integration (`--mode relay`)
- **Full-body definition text**: readSymbol/definition return complete
function/class bodies via brace matching, not just the declaration line
- **24 integration tests** with concrete value assertions covering all
handlers
## Test plan
- [x] All 551 unit tests pass
- [x] All 2 smoke tests pass
- [x] All 148 integration tests pass (including 24 new agentic tests)
- [x] Raw JSON responses manually inspected for correctness (line
numbers, text content, field names, structural completeness)
- [x] Formatted with `pixi run format`
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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## Summary by CodeRabbit
* **New Features**
* Daemon mode: background service with workspace watching and socket
support
* Relay mode: stdio ↔ Unix-socket message relay
* Expanded agentic RPC/CLI: project files, deps/impact, symbol
search/read, document symbols, definitions, references, call graphs,
type hierarchy, status, shutdown; richer query options
* **Behavioral**
* Improved indexing lifecycle and status reporting; safer shutdown
coordination and client handling
* **Tests**
* New integration tests covering agentic RPC endpoints, CLI status,
shutdown, and error cases
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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