docs: add CHANGELOG entry for 2.5.1 patch release

[carlos-alm]

Summary

• Add CHANGELOG.md entry for 2.5.1 patch release documenting all 4 PRs merged into main since v2.5.0
• Headline: recover missing branch-compare command that broke import('@optave/codegraph') entirely
• Also covers: registry prune --dry-run, execFileSync security hardening, dogfood benchmark fixes, new tests

Test plan

• Verify CHANGELOG formatting matches existing entries
• Confirm all commit hashes link correctly

[claude]

Claude finished @carlos-alm's task —— View job

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Reviewing CHANGELOG PR for 2.5.1 patch release

Todo List:

• Read and analyze CHANGELOG.md changes
• Verify formatting matches existing entries
• Check commit hashes and links
• Assess root cause and legitimacy of changes
• Review against strict criteria (config changes, test integrity, etc.)
• Provide final rating and recommendation

[greptile-apps]

Greptile Summary

Adds CHANGELOG entry for v2.5.1 patch release. Documents the critical branch-compare recovery, --dry-run flag for registry prune, execFileSync security hardening, and dogfood benchmark corrections.

• All 4 PRs since v2.5.0 are documented (fix: recover branch-compare, index.js export guard, registry prune --dry-run #167, fix: recover branch-compare, dogfood fixes, foundation reframe #170, fix(bench): remove unnecessary shell: true from execFileSync #168, docs: update build performance benchmarks (2.5.0) #164)
• Commit hashes verified correct: 2ee10d4, 3d1224d, 14d03ce, eb52074
• Formatting consistent with existing entries
• Version comparison link correctly points to v2.5.0...v2.5.1
• Date matches today (2026-02-28)

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Documentation-only change that accurately documents the 2.5.1 release. All commit hashes verified, formatting is consistent with existing entries, and content matches the actual changes merged since v2.5.0
• No files require special attention

Important Files Changed

Filename	Overview
CHANGELOG.md	Adds well-formatted 2.5.1 entry documenting all 4 PRs merged since v2.5.0, with accurate commit hashes and descriptions

_{Last reviewed commit: 8901fb6}

[greptile-apps]

_{1 file reviewed, no comments}

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