chore(benchmark): adopt A3/A5 barrel+factory+DI fixtures

[AndresL230]

Summary

Adopts the 6 new A3/A5 fixtures merged in recost-dev/extension-benchmark (recost-dev/extension-benchmark#7). No scanner code change.

• Bumps .benchmark-fixtures-sha 217ab45 → e277bc9 (the merged corpus tip).
• Refreshes benchmark/baseline.json so the gate counts the new fixtures.

New baseline

Metric	Old	New
Detection precision	35.35%	41.28%
Detection recall	51.47%	57.69%
Provider attribution	82.76%	85.29%
Finding precision	100%	100%
Finding recall	66.67%	66.67%

findingMetricsByType is unchanged — the new fixtures add no findings, so the outstanding batch FN (recost-dev/extension-benchmark#8) is intentionally preserved. Each new fixture scores detection precision/recall 1.0.

Test plan

• npm run benchmark -- --update-baseline then npm run benchmark → gate exits 0, all deltas +0.00pp (current == refreshed baseline).
• Only .benchmark-fixtures-sha and benchmark/baseline.json changed.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 959598c6-a311-4b48-befc-0f02af298058

📥 Commits

Reviewing files that changed from the base of the PR and between cc187d1 and 208ab7f.

📒 Files selected for processing (2)

• .benchmark-fixtures-sha
• benchmark/baseline.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/benchmark-baseline-a3-a5-fixtures

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