added codex structure

.codex/project.md

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+# Project configuration for Codex
+
+Edit this file for each repository.
+
+## Project identity
+
+Project name: `CHANGE_ME`
+Project description: `CHANGE_ME`
+Primary language/runtime: `CHANGE_ME`
+
+## Project mode
+
+Choose one:
+
+```text
+project_mode: personal
+project_mode: work
+```
+
+Rules:
+
+- `personal`: Docker base image policy is neutral.
+- `work`: prefer Red Hat UBI minimal images when possible.
+
+## Enabled profiles
+
+Enable only the profiles that apply to this repository:
+
+```text
+enabled_profiles:
+  - docker
+  - ansible
+  - python
+```
+
+## Branching model
+
+Codex MUST:
+
+- start from `develop`;
+- create one branch per task;
+- use one of these prefixes:
+  - `feature/`
+  - `fix/`
+  - `hotfix/`
+  - `chore/`
+  - `docs/`
+  - `refactor/`
+
+Examples:
+
+```text
+feature/add-healthcheck
+fix/selinux-authorized-keys
+hotfix/restore-container-startup
+```
+
+## Commit style
+
+Codex MUST use Conventional Commits.
+
+Examples:
+
+```text
+feat: add Docker healthcheck
+fix: correct Ansible SELinux handling
+docs: add ADR for deployment strategy
+test: add regression tests for parser
+refactor: simplify container startup logic
+chore: update Codex project metadata
+```
+
+## Test command
+
+All tests MUST be executed inside Docker containers.
+
+Configure the canonical test command for this repository:
+
+```bash
+CHANGE_ME
+```
+
+Examples:
+
+```bash
+docker compose run --rm app pytest
+```
+
+```bash
+docker compose run --rm app ruff check .
+docker compose run --rm app pytest
+```
+
+```bash
+docker compose run --rm ansible ansible-playbook --syntax-check playbook.yml
+```
+
+If no test command is configured, Codex MUST:
+
+1. report that tests are not configured;
+2. suggest the appropriate Docker-based test command;
+3. avoid claiming that the task is fully verified.
+
+## Documentation language
+
+Documentation language: English.
+Code comments language: English.