[leehack]

Summary

• Adds tests pinning the over-consumption guards of update_core_changelog_native_pin: an adjacent - bullet, * bullet and ### heading after a hand-written pin bullet survive; trailing blank lines are consumed but the next paragraph survives.

Refs #1815 (From the #1818 audit; does not close it: the column-0 #1234 continuation under-consumption is left as-is).

Production-readiness scope

• User-facing scope: None; test-only.
• Supported platforms/paths: tool/native Python tests.
• Unsupported or intentionally unavailable paths: N/A
• Out of scope / follow-ups: Column-0 #… continuation line stops the match early (pre-existing), tracked in Small follow-ups after 0.19.0 (audit P3s, test gaps, doc nits) #1815.

Completeness checklist

• Declared scope fully implemented.
• Other items N/A: test-only, no production change.

PR type guidance

• Bugfix PR: N/A, test-only.

Test Plan

• python3 -m unittest discover -s tool/native -p 'test_*.py' (195 OK); python3 tool/native/test_sync_native_release_pins.py (153 OK); CoreChangelogNativePinTest (6 OK)
• Mutations, all killed: drop # guard (heading test); drop [-*] guard (dash, star); guard only - (star); drop both (dash, star, heading); drop trailing-blank consumption (trailing-blank test); continuation crossing blanks (trailing-blank test).
• Dart format/analyze/tests: N/A, no Dart changes.

Matrix Evidence

N/A: only tool/native/test_sync_native_release_pins.py changed; classifier flags it artifactConsumer by path, no production code touched.

Review Notes

• Independent review status: fresh-agent audit at exact head e64bca8: PASS, zero blocking findings, zero PR-caused P1, 0 unresolved review threads
• CI status / head SHA: e64bca8; run 42532525239: 32 pass, 9 skipped, 0 fail

High-risk regression review

• Classification: high-risk (artifactConsumer, path-based; test-only change)
• Implementation task: this PR
• Independent blocking QA task: fresh-agent audit, accepted at the exact head (above)
• Readiness evaluator: tool/testing/high_risk_readiness.dart exit 2 (unverifiedPrerequisites), the expected local result; evidence is v2, base 9f532720b9de18f263e492ef1c049cc1abfd0ae8

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