Ensure planner writes GIT COMMIT entry before invoking git commit.
Keep history entry even when git commit fails, matching summary text.
Document invariant in code comment above write_git_commit call.
Add lightweight test to assert history write precedes git::commit using
test doubles instead of a real git repository.
Investigate git history to find regression and its prior fix, and
record a short root-cause summary outside the codebase.
Reference completed_requirements_2025-12-10_16-55-05.md for details.
Reference completed_todo_2025-12-10_16-55-05.md for task tracking.
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