v0.51.0

What's Changed

• perf: configured-rule cache (−78% allocs) + SIMD newline scan + directive-free fast path by @jeduden in #641
• perf(MDS002): Layer-0 parse-skip path for heading-style (parity migration, 1/N) by @jeduden in #643
• perf: vectorize whole-buffer byte scans with bytes.IndexByte/Count + document the lesson by @jeduden in #642
• perf: let the Layer-0 parse-skip engage on code-bearing files by @jeduden in #644
• plan: break the parity parse-skip migration into five batches by @jeduden in #645
• perf(engine): unify the two Layer-0 parse-skip gates (plan 2606171400) by @jeduden in #647
• plan(2606171401): correct the heading-rule migration approach (config-aware, depends on #647) by @jeduden in #648
• perf: Layer-0 parse-skip for MDS010/MDS011/MDS031 (fenced-code batch, 3/5) by @jeduden in #649
• plan(2606171136): mark configured-rule cache plan complete by @jeduden in #646
• plan(2606171258): sync master scope inventory with the batch plans by @jeduden in #650
• plan: line-rule fusion — spiked, measured, deprioritized (no win) by @jeduden in #651
• feat(2606171402): migrate MDS065 and MDS066 to Layer-0 nil-AST path by @jeduden in #652
• feat(2606171403): migrate list and blockquote parity rules to Layer-0 nil-AST path by @jeduden in #653
• fix(deps): bump markdown-it to 14.2.0 and js-yaml to 4.2.0 by @jeduden in #659
• perf: replace fmt.Sprintf with strconv across 5 hot paths (top-5 high-perf-Go audit) by @jeduden in #654
• feat(2606171404): migrate 11 parity rules to Layer-1 nil-AST inline path by @jeduden in #655
• feat: add nil-AST (parse-skip) paths to MDS003, MDS004, MDS051; classify MDS069 Layer 0 by @jeduden in #656
• perf: top-5 hot-path optimizations per high-performance-go.md audit by @jeduden in #658
• chore(deps): bump golang.org/x/sys from 0.44.0 to 0.46.0 by @dependabot[bot] in #660
• perf: eliminate allocation in isMarkdownPath; add coverage tests for map-set changes by @jeduden in #662
• feat(2606171258): promote MDS066 to Layer 0 so parity skips the parse by @jeduden in #661
• security: 2026-06-19 full-repo and LSP/VSCode audit results by @jeduden in #663
• Generalize the B-prose-only Layer-0 promotion (supersedes blockSkipSafe) by @jeduden in #665
• fix(security): add defer recover() to lintFile to contain rule panics (S003) by @jeduden in #666
• security: address low/info findings from 2026-06-19 full-repo audit (S004-S007) by @jeduden in #667
• security: replace os.DirFS with os.OpenRoot to contain symlink escapes (S001, S002) by @jeduden in #668
• security(S006,S007): add Workspace Trust gates to kinds and rule-doc VS Code commands by @jeduden in #669
• fix(security): panic recovery and security hardening (rounds 1–3) by @jeduden in #670

Full Changelog: v0.50.0...v0.51.0