added codex structure

.codex/prompts/documentation.md

@@ -0,0 +1,30 @@
+# Documentation 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 docs branch.
+- Write documentation in English.
+- Keep documentation practical, concise, and operationally useful.
+- Update ADRs if documenting an architectural decision.
+- Run tests only if documentation changes affect generated docs, examples, commands, or checked files.
+- Commit using Conventional Commits.
+
+Documentation task:
+<DESCRIBE DOCUMENTATION WORK HERE>
+
+Acceptance criteria:
+<LIST ACCEPTANCE CRITERIA HERE>
+
+Final response must include:
+- branch name;
+- commit hash;
+- summary of documentation changes;
+- tests/checks executed, if applicable;
+- ADR updates;
+- residual risks;
+- rollback notes.
+```