Add local commit message hook

[electrum]

Why

• Projects using the shared check only learn about invalid commit messages after CI.
• pre-commit gives consuming projects a standard way to install shared Git hooks in each checkout without copying checker logic.

Approach

• Publish the checker as a pre-commit commit-msg hook so it validates the proposed message before Git creates the commit.
• Use the same implementation for local feedback and pull-request CI.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 35e201d2-4391-4311-94b0-9ea591b60fc8

📥 Commits

Reviewing files that changed from the base of the PR and between 98f2fa5 and 6c10627.

📒 Files selected for processing (4)

• .pre-commit-hooks.yaml
• check-commit-messages/README.md
• check-commit-messages/check.py
• check-commit-messages/test_check.py

📝 Walkthrough

Walkthrough

The commit-message checker now validates either revision ranges or individual commit-message files. File input is cleaned of Git comments and scissors sections before shared subject, description, and attribution checks run. The CLI adds mutually exclusive message-file and revision-range modes with distinct success output. A pre-commit commit-msg hook and documentation for local installation and SHA pinning were added, along with integration coverage for cleaned message files.

Possibly related PRs

• airlift/github-actions#1: Introduced the commit-message validator extended by this change.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 3780e821-822e-48d9-8d43-5969d2668d18

📥 Commits

Reviewing files that changed from the base of the PR and between 3cd4cf2 and 98f2fa5.

📒 Files selected for processing (5)

• .pre-commit-hooks.yaml
• README.md
• check-commit-messages/README.md
• check-commit-messages/check.py
• check-commit-messages/test_check.py