chore: update ahocorasick v0.2.1 → v0.3.0

[kolkov]

Summary

• Update github.com/coregx/ahocorasick dependency from v0.2.1 to v0.3.0
• Adapt 7 call sites to new zero-allocation Find/FindAt API: (Match, bool) instead of *Match
• Update CHANGELOG.md and ROADMAP.md

Changed files

• go.mod / go.sum — dependency bump
• prefilter/ahocorasick.go — 1 call site
• meta/find.go — 4 call sites (findTeddy, findTeddyAt, findAhoCorasick, findAhoCorasickAt)
• meta/find_indices.go — 2 call sites (findIndicesAhoCorasick, findIndicesAhoCorasickAt)

Test plan

• go build ./... — clean
• go test ./... — all 11 packages pass
• gofmt -l . — clean (excluding tmp/)
• CI: tests on 3 OS (ubuntu, macos, windows)
• CI: benchmark comparison (no regressions expected — API change only, no logic change)

[codecov]

Codecov Report

❌ Patch coverage is 21.42857% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
meta/find.go	37.50%	4 Missing and 1 partial ⚠️
meta/find_indices.go	0.00%	4 Missing ⚠️
prefilter/ahocorasick.go	0.00%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[github-actions]

Benchmark Comparison

Comparing main → PR #161

Summary: geomean 104.3n 104.5n +0.12%

⚠️ Potential regressions detected:

geomean                    104.3n         104.5n        +0.12%
geomean                               ³                +0.00%               ³
geomean                               ³                +0.00%               ³
geomean              32.48n         32.60n        +0.35%
geomean                         ³                +0.00%               ³
geomean                         ³                +0.00%               ³
AhoCorasickVsStdlib/stdlib_MatchString-4                192.9µ ± ∞ ¹    207.8µ ± ∞ ¹    +7.76% (p=0.008 n=5)
AhoCorasickVsStdlib/stdlib_Find-4                       196.0µ ± ∞ ¹    207.3µ ± ∞ ¹    +5.79% (p=0.008 n=5)
AhoCorasickManyPatterns/stdlib_10_patterns-4            186.3n ± ∞ ¹    244.9n ± ∞ ¹   +31.45% (p=0.008 n=5)
AhoCorasickManyPatterns/stdlib_25_patterns-4            144.7n ± ∞ ¹    191.5n ± ∞ ¹   +32.34% (p=0.008 n=5)

Full results available in workflow artifacts. CI runners have ~10-20% variance.
For accurate benchmarks, run locally: ./scripts/bench.sh --compare