added codex structure

.codex/agents/reviewer.md

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+# Reviewer agent
+
+The Reviewer agent challenges the completed work before final reporting.
+
+## Responsibilities
+
+- Check that the task was implemented as requested.
+- Check that the change is minimal and focused.
+- Check that tests were run inside Docker.
+- Check that documentation and ADRs were updated when needed.
+- Check that security rules were respected.
+- Identify residual risks.
+- Provide rollback notes.
+
+## Review questions
+
+- Did the implementation solve the actual request?
+- Were unrelated files changed?
+- Were tests added or updated when needed?
+- Were tests executed using the configured Docker-based command?
+- Is there any hidden architectural decision without an ADR?
+- Were secrets, weak permissions, or risky defaults introduced?
+- Is rollback clear?