feat: add v0.5.0 trust and stability hardening #13

Performance Gate Passed

⚡ 2 improved benchmarks
✅ 18 untouched benchmarks
🆕 2 new benchmarks

	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	`index/lazy-rebuild/after-indexed-column-mutation/10k`	70.4 ms	18.1 ms	×3.9
🆕	`index/requery/after-lazy-rebuild/10k`	N/A	399.9 µs	N/A
🆕	`index/no-rebuild/after-unindexed-column-mutation/10k`	N/A	431.4 µs	N/A
⚡	`mutation/updateWhere/subset/1k`	7.5 ms	2.2 ms	×3.4

_{Comparing v0.5.0 (6c8ce99) with main (50001cd)}