Enforce Morpheus response grounding

[vycdev]

Summary

• consume Claude response runs as bounded stream-JSON and retain final text plus completed tool-call evidence
• require explicit Morpheus requests and contextual retries such as try again after m!top to contain a completed Morpheus MCP result
• retry once only when the model made no Morpheus call and used no potentially mutating tool
• fail closed instead of forwarding an invented success when evidence is still absent or a started call has no result

Validation

• verified Claude Code 2.1.220 stream events against the live Morpheus describe_command tool
• focused process, stream, grounding, prompt, and routing tests: 18/18 passed
• npm test: 154/157 passed; the same three unrelated local Claude-auth PTY tests fail before a login URL is emitted