v0.3.6 — Dependency upgrades

Dependency Upgrades

• rusqlite 0.31 → 0.39: Bundled SQLite 3.51.3 with FTS5 improvements
• sha2 0.10 → 0.11: Updated digest API
• thiserror 1 → 2: drop-in replacement, faster compile
• Removed dead deps: pulldown-cmark, ndarray (unused)
• 17 patch-level updates: rustls security, ruzstd, tracing, etc.

Benchmark Baseline

Captured Criterion benchmarks for index_100_files and search_1000_notes to track performance across versions.

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Full changelog: v0.3.5...v0.3.6