v2.1.0

## [2.1.0] - 2026-04-05

Code files now chunk at function and class boundaries via tree-sitter,
clickable editor links land you at the right line from search results,
and per-collection model configuration means you can point different
collections at different embedding models. 25+ community PRs fix
embedding stability, BM25 accuracy, and cross-platform launcher issues.

### Changes

- AST-aware chunking for code files via `web-tree-sitter`. Supported
  languages: TypeScript/JavaScript, Python, Go, and Rust. Code files
  are chunked at function, class, and import boundaries instead of
  arbitrary text positions. Markdown and unknown file types are unchanged.
  `--chunk-strategy <auto|regex>` flag on `qmd embed` and `qmd query`
  (default `regex`). SDK: `chunkStrategy` option on `embed()` and
  `search()`. `qmd status` shows grammar availability.
- `qmd bench <fixture.json>` command for search quality benchmarks.
  Measures precision@k, recall, MRR, and F1 across BM25, vector, hybrid,
  and full pipeline backends. Ships with an example fixture against
  the eval-docs test collection. #470 (thanks @jmilinovich)
- `models:` section in `index.yml` lets you configure `embed`, `rerank`,
  and `generate` model URIs per collection. Resolution order is
  config > env var (`QMD_EMBED_MODEL`, `QMD_RERANK_MODEL`,
  `QMD_GENERATE_MODEL`) > built-in default. #502
  (thanks @JohnRichardEnders)
- CLI search output now emits clickable OSC 8 terminal hyperlinks when
  stdout is a TTY. Links resolve `qmd://` paths to absolute filesystem
  paths and open in editors via URI templates (default:
  `vscode://file/{path}:{line}:{col}`). Configure with `QMD_EDITOR_URI`
  or `editor_uri` in the YAML config. #508 (thanks @danmackinlay)
- `--no-rerank` flag skips the reranking step in `qmd query` — useful
  when you want fast results or don't have a GPU. Also exposed as
  `rerank: false` on the MCP `query` tool. #370 (thanks @mvanhorn),
  #478 (thanks @zestyboy)
- ONNX conversion script for deploying embedding models via
  Transformers.js. #399 (thanks @shreyaskarnik)
- GitHub Actions workflow to build the Nix flake on Linux and macOS.

### Fixes

- Embedding: prevent `qmd embed` from running indefinitely when the
  embedding loop stalls. #458 (thanks @ccc-fff)
- Embedding: truncate oversized text before embedding to prevent GGML
  crash, and bound memory usage during batch embedding. #393
  (thanks @lskun), #395 (thanks @ProgramCaiCai)
- Embedding: set explicit embed context size (default 2048, configurable
  via `QMD_EMBED_CONTEXT_SIZE`) instead of using the model's full
  window. #500
- Embedding: error on dimension mismatch instead of silently rebuilding
  the vec0 table. #501
- Embedding: handle vec0 `OR REPLACE` limitation in `insertEmbedding`.
  #456 (thanks @antonio-mello-ai)
- Embedding: fix model selection when multiple models are configured.
  #494
- BM25: correct field weights to include all 3 FTS columns — title,
  body, and path were not weighted correctly. #462 (thanks @goldsr09)
- BM25: handle hyphenated tokens in FTS5 lex queries so terms like
  "real-time" match correctly. #463 (thanks @goldsr09)
- BM25: preserve underscores in search terms instead of stripping them.
  #404
- BM25: use CTE in `searchFTS` to prevent query planner regression with
  collection filter.
- Reranker: increase default context size 2048→4096 and make
  configurable via `QMD_RERANK_CONTEXT_SIZE`. Fix template overhead
  underestimate 200→512. #453 (thanks @builderjarvis)
- GPU: catch initialization failures and fall back to CPU instead of
  crashing.
- MCP: read version from `package.json` instead of hardcoding. #431
- MCP: include collection name in status output. #416
- Multi-get: support brace expansion patterns in glob matching. #424
- Launcher: prioritize `package-lock.json` to prevent Bun false
  positive. #385 (thanks @rymalia)
- Launcher: remove `$BUN_INSTALL` check that caused false Bun detection.
  #362 (thanks @syedair)
- Launcher: skip Git Bash path detection on WSL. #371
  (thanks @oysteinkrog)
- Model cache: respect `XDG_CACHE_HOME` for model cache directory. #457
  (thanks @antonio-mello-ai)
- SQLite: add macOS Homebrew SQLite support for Bun and restore
  actionable errors. #377 (thanks @serhii12)
- Pin zod to exact 4.2.1 to fix `tsc` build failure. #382
  (thanks @rymalia)
- Preserve dots and original case in `handelize()` — filenames like
  `MEMORY.md` no longer become `memory-md`. #475 (thanks @alexei-led)
- Include `line` in `--json` search output so editor integrations can
  jump directly to `file:line`. #506 (thanks @danmackinlay)
- Nix: fix paths in flake and make Bun dependency a fixed-output
  derivation so sandboxed Linux builds work offline. #479
  (thanks @surma-dump)
- Sync stale `bun.lock` (`better-sqlite3` 11.x → 12.x). CI and release
  script now use `--frozen-lockfile` to prevent recurrence. #386
  (thanks @Mic92)
- Approve native build scripts in pnpm so `better-sqlite3` and
  tree-sitter modules compile correctly. Update vitest ^3.0.0 → ^3.2.4.