Add Codex repository baseline

AGENTS.md

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+# Agent Instructions
+
+## Project
+
+Robocopy_Overhaul: Codex-ready repository baseline for a Robocopy overhaul project.
+
+## Repository Rules
+
+- Start by reading `AGENTS.md` and `.codex/project.md`.
+- Keep changes scoped to the user's request.
+- Prefer existing project patterns once application code exists.
+- Do not commit secrets, `.env` files, private keys, certificates, or tokens.
+- Do not rewrite history or run destructive git commands unless explicitly requested.
+- Do not create a release unless explicitly requested.
+- Check the working tree before editing and before finishing. Preserve unrelated user changes.
+- If `GITEA_TOKEN` is available locally, use it only for read-only Gitea API checks such as private repository metadata, package-read visibility, and Actions run status. Never print, commit, or store the token.
+- Repository cleanup automation must be non-destructive if added later.
+- Dependency, compliance, and release dry-run automation must report findings only unless the user explicitly asks for write actions.
+
+## Commands
+
+No stack-specific commands are defined yet.
+
+When code is added, update this file and `.codex/project.md` with the real commands for:
+
+```text
+lint
+test
+build
+audit
+```
+
+## Artifacts
+
+No release artifact output directory is defined yet.
+
+## Security Notes
+
+- Review `docs/security-review.md` before release work.
+- Treat generated credentials and config files as sensitive.
+- Keep external network calls documented.
+- Prefer local processing for user data.
+- Keep CI publishing secrets in repository or organization secrets, not in tracked files.
+- Ensure `.gitignore` covers local config, build outputs, logs, temporary files, and secret material for the detected stack.
+
+## Finish Checklist
+
+- `git diff --check` passes when the directory is a Git repository.
+- The cheapest reliable verification command has been run, or the reason it could not run is documented.
+- README, changelog, security review, and release checklist are updated when the change touches release behavior.
+- `docs/agent-handoff.md` is updated when work is interrupted, risky, or spans multiple sessions.