feat(git): pre-push also rejects coding-agent authors

Block commits where the author name/email contains any of:
copilot, claude, codex, chatgpt, cursor, aider, devin, [bot],
@openai., @anthropic.

Use plain index() substring matching in awk to dodge regex-escaping
pitfalls (an earlier draft using regex turned \[bot\] into a char
class via -v escape processing and false-matched 'o' in 'com').

Fix: rebase with --reset-author re-stamps you as author while
keeping the agent as it was (or drop them entirely). Documented in
the failure message.

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