chore(hooks): run push checks from one lefthook config

[angelicawill]

This PR moves pre-push hooks to lefthook and updates DEV-380 so all repos use the same setup.

partially resolves holdex/marketing#1155

Why

The old setup manually figured out which files changed in a push, with the same logic duplicated across multiple files and repos.

lefthook already handles this with {push_files}, including a branch's first push.

What changes

• lefthook.yml now runs the markdown, authoring, and rules checks.
• hooks.yml runs the same setup in CI.
• .githooks/pre-push and rules_audit.yml are removed.
• markdown_lint.yml still checks commit and PR titles.
• DEV-380 now requires lefthook instead of .githooks.

Known limit

lefthook skips hooks on delete-only pushes. Since deleting a rule can still break dependencies, CI also runs check-rules.mjs --rules separately.

After merge

Run npm install once to remove the old core.hooksPath setting and install lefthook.

Testing

Tested locally:

• Bad markdown: blocked
• Broken rule ID: blocked
• No markdown changes: passes
• Delete-only push: caught by the separate rules check

This will be the first run of hooks.yml on GitHub.

[coderabbitai]

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[holdex]

Time Submission Status

Member	#	Time	Running Total	Status	Last Update
angelicawill			15min	✅ Submitted	Sep 23, 2026, 10:10 AM
williamrusdyputra			14min	✅ Submitted	Sep 23, 2026, 11:44 AM

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[angelicawill]

@holdex pr add-time 15m

[angelicawill]

@williamrusdyputra @teodorus-nathaniel @zolotokrylin ready for review

[williamrusdyputra]

log: reviewing

[williamrusdyputra]

@holdex pr add-time 14m