Update README.md

[magetsu002]

Summary

Adds a visible README note explaining that OpsHaven is still under active development, should be evaluated on disposable infrastructure before production use, and welcomes community feedback and contributions.

Change type

• Bug fix
• Feature
• Security hardening
• Refactor
• Documentation
• Dependency update
• CI / tooling

Motivation

Set clear expectations for early users without implying that the project is unusable, while encouraging testing, bug reports, documentation improvements, and focused contributions.

Related issue: N/A

Implementation details

Added a concise GitHub note near the top of the README:

> [!NOTE]
> **OpsHaven is still under active development.** It is best tested on disposable infrastructure before production use. Feedback, bug reports, documentation improvements, and focused contributions are welcome.

No product code, workflows, configuration, or security behavior changed.

Security impact

Does this change affect any of the following?

• Authorization decisions
• Capability permissions
• Remote execution boundary
• SSH transport behavior
• Key handling or cryptography
• Audit logging
• Rollback behavior
• No security impact

If yes, explain: N/A

Validation performed

Commands/tests executed:

• npm test
• npm run release:check
• npm run security

Additional validation:

• Confirmed the README renders the GitHub note correctly.
• Confirmed no files outside the intended documentation change were modified.

Security considerations

No security assumptions changed. Existing authorization, execution-boundary, audit, rollback, and credential protections remain unchanged because this is a documentation-only update.

Compatibility

Does this change affect:

• Existing configurations
• Existing installations
• CLI commands
• MCP protocol behavior
• No compatibility impact

Documentation

• Documentation updated
• Operator workflow updated if needed
• No documentation changes required

Final checklist

• Tests pass
• Security checks pass
• No secrets or private keys included
• No security controls weakened
• Backward compatibility considered
• Ready for review