refactor(server): extract Indexer and Compiler from MasterServer (#403)
## Summary - **Extract `Indexer` class** — owns all index state (ProjectIndex, MergedIndex shards, OpenFileIndex) and query methods (definition, references, call/type hierarchy, workspace symbol search) - **Extract `Compiler` class** — owns document state, PCH/PCM cache, compile argument resolution, header context, `ensure_compiled`, and worker forwarding - **MasterServer is now a pure LSP handler registration layer** (~700 lines, down from ~3200) - **`MergedIndexShard`** wraps `index::MergedIndex` with a lazily-cached PositionMapper; `OpenFileIndex` gains matching `find_occurrence()`/`find_relations()` APIs — callers get pre-converted LSP ranges directly - **Indexer returns typed values** (`vector<Location>`, `vector<CallHierarchyIncomingCall>`, etc.) instead of pre-serialized JSON, fixing the references handler from JSON string surgery to simple vector concatenation - **Fix**: duplicate `workspace/symbol` loop in the original code ## Test plan - [x] 465 unit tests pass - [x] 113 integration tests pass - [x] 2/2 smoke tests pass - [x] `clang-format` applied 🤖 Generated with [Claude Code](https://claude.com/claude-code) <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Server-side C++ compilation orchestration (module & precompiled header builds) with LSP-integrated document handling. * **Improvements** * Deterministic, persistent, dependency-aware caching to avoid redundant rebuilds and speed up incremental work. * Better cross-file indexing and navigation, improved diagnostics and more reliable include/import-aware completions. * **Tests** * Unit tests updated to the unified worker query/build request shapes. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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