fix(opencode): clarify git amend condition to require verifying commit landed

[altendky]

Issue for this PR

Closes #19936

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adjusts condition (1) in the git amend guidance to make explicit that the agent must verify the commit actually landed (via git log) before amending. This prevents incorrect amends when pre-commit hooks modify files but the commit itself failed.

The original wording "commit SUCCEEDED" was ambiguous — when hooks modify files, the agent sees modified files regardless of whether the commit landed. Different hook frameworks behave differently (pre-commit blocks on modification, lint-staged/Lefthook can succeed), so explicit verification is necessary.

How did you verify your code works?

Read the updated guidance and confirmed it now explicitly requires checking git log to verify HEAD is the new commit before amending.

Screenshots / recordings

N/A

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title clarify git amend condition to require verifying commit landed doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍