self-review

Independently review the current branch implementation for GitHub Issue $0.

Read AGENTS.md, the Issue, and the branch diff against main. Do not modify files, commit, push, or change GitHub state.

Prioritize:

• unmet acceptance criteria
• correctness defects and regressions
• existing contract violations
• repository ownership, dependency, and information-flow boundary violations
• concrete changed behavior that lacks necessary regression coverage

Do not make speculative extensibility, unrelated cleanup, or style already enforced by tooling blocking.

Classify findings as blocking or non-blocking. If no blocking finding remains, explicitly conclude blockingなし / merge可能.