Add standalone Mermaid diagram for RIPER-5 workflow

[MrShirini]

What

Added a standalone Mermaid diagram visualizing the RIPER-5 workflow lifecycle with approval and validation checkpoints.

Type

• Skill (community contribution)
• Agent (community contribution)
• Hook
• Protocol / process improvement
• Translation
• Bug fix
• Documentation

Related Issues

Closes #10

Checklist

• No project-specific content leaked (no hardcoded paths, secrets, or personal data)
• vc-manifest.json updated (if adding/removing managed files)
• Tested in a real project via install.sh (not just unit tests)
• Both .claude/ and .codex/ versions created (if adding agents)

Screenshots / Recordings

N/A

Breaking Changes

• This PR introduces breaking changes

AI Disclosure

Used ChatGPT for brainstorming and improving Mermaid diagram structure and wording.

Notes

The diagram follows the existing Mermaid styling patterns used throughout the README.

[MrShirini]

The PR checks appear to fail due to the actions/first-interaction GitHub Action reference being unavailable:

actions/first-interaction@530e038ee9729a57bac8f91f4dd8c0e8d498b59b

I believe this is unrelated to the documentation changes in this PR.

[coderabbitai]

Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• docs/RIPER-5-FLOW.md

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 36ce69a5-54e9-4c95-adcf-b441c2e8e2a5

📥 Commits

Reviewing files that changed from the base of the PR and between ae1c280 and 8dbca13.

📒 Files selected for processing (1)

• docs/RIPER-5-FLOW.md

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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