[codex] add repository deprecation notice

[riderx]

Summary

• Add a prominent GitHub warning at the top of the README stating that this repository is deprecated.
• Point users to the main Capgo monorepo where the CLI now lives.
• Link to the current Capgo CLI documentation.

Impact

Users landing on this repository will immediately see that new issues, pull requests, and CLI development should happen in the Capgo monorepo instead.

Validation

• README diff reviewed locally.
• CI checks pending on this draft PR.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f7ea17b6-8d69-48d7-bbdf-9037c5b46d8a

📥 Commits

Reviewing files that changed from the base of the PR and between 56be82c and 6588feb.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/readme-deprecation-notice

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud