fix: checkout governed check tools in reusable workflow

[hummbl-dev]

Linked Issue

Refs hummbl-dev/hummbl-dev#56

Boundary

• Public
• Private
• Internal-only
• Sensitive / requires review

Source Status

• No source/canon impact
• Source candidate only
• Prior art
• Canon-bearing change
• Deprecated/removal

Change Class

• Docs-only
• CI/CD
• Source packet
• Code/runtime
• Governance
• Public surface

Evidence

Tests/checks run:

• ruby -e 'require "yaml"; YAML.load_file(...)'

Receipt:

• Branch: fix/codex/governed-pr-check-tool-checkout
• Commit: 24310c0423aefec97e8063725b4b88ecf6dbf08d
• Pilot failure addressed: reusable workflow now checks out hummbl-dev/.github into governed-pr-check-tools before running .github/scripts/governed_pr_check.py.
• Owner review path: CODEOWNERS/governance reviewer should review before merge because .github/workflows/ is changed.

Notes

The hummbl-dev/hummbl-dev#91 pilot showed that reusable workflow callers do not automatically have the shared checker script in their checkout. This fixes the reusable workflow rather than copying the script into each adopter repo.

[hummbl-dev]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3d1c6a68-dbf0-47f3-ab13-f76643c46aee

📥 Commits

Reviewing files that changed from the base of the PR and between 228ffb7 and 24310c0.

📒 Files selected for processing (1)

• .github/workflows/governed-pr-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/codex/governed-pr-check-tool-checkout

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[hummbl-dev]

Codex review receipt before merge.

CodeRabbit disposition:

• @coderabbitai review returned rate-limited: next review available in ~6 minutes.
• The CodeRabbit status context is success, but no formal review object was created for this PR.

Manual validation:

• Workflow YAML parsed successfully with Ruby YAML.
• Live governed-pr-check passed on this PR.
• Diff scope is limited to the reusable workflow checkout path: checkout hummbl-dev/.github into governed-pr-check-tools, then run the shared script from that path.

Reason for merging now:

• This fixes the active pilot failure in hummbl-dev/hummbl-dev#91 caused by reusable workflow callers not having the shared script in their repository checkout.

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