Add Codex repository baseline

docs/release-notes.md

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+# Robocopy_Overhaul Unreleased
+
+## Downloads
+
+No release artifacts are published yet.
+
+## Highlights
+
+- Added Codex Agent Repository Kit baseline files.
+
+## Security
+
+- Dependency audit: not applicable until dependencies exist.
+- Secret handling: baseline `.gitignore` excludes common local config and secret files.
+- External network calls: no project implementation exists yet.
+
+## Verification
+
+| Check | Result |
+| --- | --- |
+| lint | Not available |
+| test | Not available |
+| build | Not available |
+| Artifact download | Not available |
+
+## Notes
+
+This repository is not release-ready until implementation code, commands, CI, and artifacts are defined.