Remove PR approval gate from CLAUDE.md workflow

[juhgiyo]

Summary

• Removes the manual PR approval gate from the CLAUDE.md workflow
• Agents now proceed directly to rebase/commit/PR after completing code changes, without waiting for explicit approval of the diff
• The 4-step workflow (rebase → push to open PR or create new branch → open PR → never reuse merged branches) is preserved, just without the approval gate

Test plan

• Verify CLAUDE.md renders correctly in each repo
• Confirm agents follow the updated workflow without waiting for approval

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