Major additions:
- VECTOR(N) column type with packed LE f32 binary storage
- HNSW index for approximate nearest neighbor search with configurable
  M, ef_construction, ef_search, and distance metric (L2, cosine, IP)
- <=> operator and VEC_DISTANCE_L2/COSINE/IP scalar functions
- Vector search optimizer: HNSW index path (O(log N)) with WHERE
  post-filtering, or parallel brute-force k-NN with fused distance+topK
- VACUUM statement and PRAGMA VACUUM for manual cleanup
- CREATE INDEX ... USING HNSW WITH (m=16, ef_construction=200, metric='cosine')

Refactoring:
- Value::Json replaced by Value::Extension (tag-in-data pattern) keeping
  Value at 16 bytes with room for future types via DataType enum
- Index modules consolidated under src/storage/index/ with parking_lot
- Table::update setter signature changed to return Result<(Row, bool)>
  for proper error propagation and statement-level atomicity
- Lexer string literal fast path (zero-alloc for non-escaped strings)
- build_column_index_map adds unqualified fallbacks for qualified columns

Persistence:
- WAL backward-compatible serialization (tags 6/9/10/11 for Extension)
- Snapshot schema includes vector_dimensions for VECTOR columns
- HNSW graph files timestamped to match data snapshots for consistency
- IndexMetadata extended with HNSW-specific parameters

- Add Playground link, remove Website link from header
- Link all three drivers (Node.js, Python, WASM)
- Link vector and semantic search doc pages
- Remove duplicate build/test commands in Development section
- Fix #[inline(always)] + #[target_feature] error on x86_64

All ../category/page relative links resolved incorrectly on the live
site (e.g. ../sql-features/subqueries from /docs/getting-started/
resolved to /docs/getting-started/sql-features/subqueries instead of
/docs/sql-features/subqueries). Converted 38 links across 18 files
to {% link _docs/category/page.md %} Jekyll tags.

All content is already covered in docs/_docs/sql-features/subqueries.md
which is more comprehensive. A subqueries guide doesn't belong in the
Getting Started section.

…eshold)

- HNSW batch recall test: replace sin-based vectors with clustered Gaussian
  data (matching vector_search_bench.rs pattern) and deterministic LCG PRNG
  for reproducible results across platforms
- Fix test_hnsw_cosine_index table name collision with test_hnsw_cosine_distance
  (both used memory://hnsw_cosine, collides under cargo test same-process execution)
- Raise unique constraint perf test threshold from 800ms to 2000ms to accommodate
  coverage instrumentation overhead (normal execution ~130ms)

…ility

## Homepage
- Add Vector & Semantic Search spotlight with HNSW code example
- Add vector search scene to hero terminal animation
- Add Native Vector / HNSW Search row to comparison table
- Fix Rust API example to match actual `db.execute`/`db.query` API
- Update hero tagline, feature grid, architecture section for vector
- Point spotlight links to specific doc pages (MVCC, optimizer, parallel)

## Site-wide
- Add search modal with keyboard shortcut (`Cmd/Ctrl+K`)
- Add scroll-to-top button with subtle hover
- Add skip-to-content link for accessibility
- Add `aria-label`, `aria-hidden`, `aria-controls` across components
- Semantic HTML: `h4` to `h3`, `<time>` for blog dates, `<caption>` on table
- Logo SVG `fill` to `currentColor` for theme support
- Fix favicon type, add `theme-color` meta tag

## CSS/JS
- Add search modal and trigger styles
- Add `:has()` fallback classes for blog/post pages
- Deduplicate `fadeUp`/`fadeIn` keyframes into `main.css`
- Add XHR error handling for search
- Replace deprecated `navigator.platform`

## Docs consistency
- Add HNSW to index lists in optimization, MVCC, expression-pushdown, docs index
- Fix function counts: Scalar (89), Vector (6), base total 117
- Add Native Vector / HNSW Search to README comparison table
- Note `EMBED()` as optional (`--features semantic`)

## Other
- New `search.json` template for site search
- Fix `baseurl` in `_config.yml`
- Remove em dashes from playground page
- Fix missing closing `</div>` in playground

…Started open

- Make Table of Contents collapsible (collapsed by default, click to expand)
- Increase sidebar nav font size from 0.82/0.85rem to 0.95rem
- Fix code block copy button overlapping language badge (measure with probe span instead of unreliable getComputedStyle on ::before)
- Fix consecutive code blocks having no vertical spacing (remove margin:0 override on div.highlighter-rouge)

- Attention heads: 6 → 12
- Parameters: 22M → 22.7M
- Add training data size (1.17B sentence pairs)

All per HuggingFace model card for all-MiniLM-L6-v2.

…id background

- Smooth gradient transition from header to content (matching homepage/playground)
- Category filter pills with JS filtering and pagination
- Post cards with category badges, read time, terminal-style layout
- Subtle line grid background on header with radial fade
- Gradient accent on Blog title
- Add category frontmatter to existing post
- Remove dead CSS

…port

Add self-contained ANN benchmark binary (examples/ann_benchmark.rs) that
downloads Fashion-MNIST, computes ground truth, and runs HNSW parameter
sweeps through the full SQL path. Add benchmark report page with 81-config
sweep results (10K queries, single-core) and SVG chart. Add blog post
covering vector and semantic search in SQL. Add vector search tables and
query chips to the playground. Fix blog card layout alignment.