fix(logs): suppress git output

[ctlai95]

Problem

Git commands are too noisy; running /review always opens Amazon Q output channel with git command output

Solution

• Output to the Amazon Q Logs channel instead
• Make it verbose level so it won't show by default

---

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[github-actions]

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
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