added codex structure

.codex/prompts/refactor.md

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+# Refactor prompt
+
+```text
+You are working in this repository as Codex.
+
+Mandatory instructions:
+- Read AGENTS.md and all relevant files under .codex/ before making changes.
+- Start from develop.
+- Create a dedicated refactor branch.
+- Preserve existing behavior.
+- Do not introduce new features.
+- Do not perform unrelated cleanups.
+- Add tests only if coverage is missing for the behavior being preserved.
+- Run the configured Docker-based test command from .codex/project.md.
+- Update documentation and ADRs if required.
+- Commit using Conventional Commits.
+
+Refactor goal:
+<DESCRIBE THE REFACTOR HERE>
+
+Non-goals:
+<LIST WHAT MUST NOT CHANGE>
+
+Acceptance criteria:
+<LIST ACCEPTANCE CRITERIA HERE>
+
+Final response must include:
+- branch name;
+- commit hash;
+- summary of changes;
+- confirmation that behavior is preserved;
+- tests executed and result;
+- documentation/ADR updates;
+- residual risks;
+- rollback notes.
+```