chore(ci): bump public-workflows pins to v2.9.3

[nsportsman]

Bumps all praetorian-inc/public-workflows reusable-workflow pins to v2.9.3 (0c602372f3d0d038912dd08e159ecc83954a4995). Org-wide drift sweep: v2.9.3 carries the go-ci/go-sec preflight fix (compare API needs only contents:read, eliminating the logless startup_failure on narrow-permission callers) and the opus-4.8 'thinking' reviewer fix (>= v2.6.4). No caller max_turns change needed — drift default is now 45 in v2.9.3.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 26bfa74e-bfb8-4f60-9bfe-5a4ea95d9639

📥 Commits

Reviewing files that changed from the base of the PR and between 828c675 and 2641d74.

📒 Files selected for processing (9)

• .github/workflows/ci.yml
• .github/workflows/claude-code.yml
• .github/workflows/claude-md-drift.yml
• .github/workflows/codex-code.yml
• .github/workflows/external-contribution.yml
• .github/workflows/gemini-code.yml
• .github/workflows/release.yml
• .github/workflows/secrets-scan.yml
• .github/workflows/verify-pins.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-public-workflows-v2.9.3

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[github-actions]

Gemini Review

Critical Issues

None.

Security

No security concerns flagged.

Suggestions

No suggestions.

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Reviewed by Gemini (gemini-3.1-pro-preview)

[github-actions]

Claude Review

Critical issues

None. All 9 workflow files bump cleanly to a single consistent commit SHA (0c602372f3d0d038912dd08e159ecc83954a4995, labeled v2.9.3). Pure pin bump, no caller-side config changes.

Security

• Pins remain full 40-char commit SHAs (not tags), preserving immutable supply-chain pinning — good. Worth a one-time confirmation that 0c602372... is the actual commit the v2.9.3 tag points to in praetorian-inc/public-workflows, since the SHA is what's trusted and the version comment is advisory only.
• No permissions blocks were changed; callers retain their existing least-privilege scopes.

Test coverage

N/A — CI workflow pin bump only, no *.go/*.ts/*.py production code touched.

No critical issues — LGTM pending human review.

[github-actions]

Codex Review

No critical issues — LGTM pending human review.

Checked git diff HEAD^1 HEAD, git diff --check, and YAML parsing for the changed workflow files. Sandbox DNS blocked fetching public-workflows for deeper callee inspection.

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Reviewed by Codex (gpt-5.5)