docs: document catalog and workflow capabilities

[halfofning]

Summary

• Document catalog registries, workflow coordination, MCP tools, deployment, operations, and configuration.
• Refresh public and admin OpenAPI reference documents.

Cross-Repo Change Set

Tracking issue: none supplied

Related PRs:

• acornops/llm-gateway: feat(mcp): add extensible catalog sources and PAT auth llm-gateway#5
• acornops/agentk: fix(runtime): recover discovery and refresh capabilities agentk#2
• acornops/agentv: fix(runtime): refresh capabilities after reconnect agentv#2
• acornops/execution-engine: feat(runtime): enforce tool authority and report artifacts execution-engine#5
• acornops/control-plane: feat(platform): add catalog and workflow coordination control-plane#15
• acornops/acornops-deployment: feat(platform): configure catalog and fixture runtime acornops-deployment#16
• acornops/management-console: feat(ui): unify catalog, workflow, and target experiences management-console#17
• acornops/docs-website: docs: document catalog and workflow capabilities #10
• acornops/acornops: chore(harness): enforce runtime truth boundaries acornops#11

Merge order:

1. acornops/llm-gateway
2. acornops/agentk
3. acornops/agentv
4. acornops/execution-engine
5. acornops/control-plane
6. acornops/acornops-deployment
7. acornops/management-console
8. acornops/docs-website
9. acornops/acornops

Validation

• PASS: npm run check (14 navigation pages)
• BLOCKED: Mintlify validation requires Node 20.17+; runner has Node 18.

Docs Impact

• Documentation and contract manifests are updated in this PR or a related documentation/deployment PR.

Residual Risk

• Mintlify validation and link checking remain for CI on the supported Node runtime.