docs: add AgentOpus MCP to generative video lane

[WalksWithASwagger]

Summary

• Add docs/AGENT-OPUS-MCP.md for the hosted AgentOpus generative-video MCP
• Cross-link from INDEX, MCP, and Floyo so it sits with Rafiki generation — not OpusClip clipping

Test plan

• Open docs/AGENT-OPUS-MCP.md and confirm endpoint https://api.opus.pro/api/agent-mcp
• INDEX / MCP / Floyo links resolve
• kk-kb PR #2659 points at this runbook

Made with Cursor

[github-actions]

Agentic Traceability

Verdict: needs-human

Checks:

• Linked GitHub issue present: no
• Branch naming matches contract: no
• PR title prefix matches contract: yes
• PR body includes Linear line when required: yes
• Linear keys found: none

Next actions:

• Add Closes #<issue> or Refs #<issue> to the PR body so GitHub remains the execution truth.
• Use codex/issue-<number>-<slug> for GitHub-only work outside the active Linear delivery lane.

[github-actions]

Agentic Traceability

Verdict: needs-human

Checks:

• Linked GitHub issue present: no
• Branch naming matches contract: no
• PR title prefix matches contract: yes
• PR body includes Linear line when required: yes
• Linear keys found: none

Next actions:

• Add Closes #<issue> or Refs #<issue> to the PR body so GitHub remains the execution truth.
• Use codex/issue-<number>-<slug> for GitHub-only work outside the active Linear delivery lane.