Update the live-demo sections of the field FAQ

[anurag]

Summary

After PRs #27 to #32, the live-demo sections of docs/FAQ.md did not agree with the UI and the pipeline. This change makes them agree, and corrects five links.

Changes

docs/FAQ.md:

• Lists the ten stages that the UI shows, from public/app.js.
• Tells which prompt gives a static site, and which gives an API and a database. Tells presenters to use a kind of business, not the name of a real company.
• Adds a rehearsal, a fallback app, and the checks to do before a presenter goes on stage.
• Replaces the talking points with one line for each stage, and names the worker of each stage: an agent, workflow code, or Render.
• Says where the agents use the Render MCP server: the architect reads the workspace, and the deploy manager reads a failed deploy. Workflow code reads Render over the REST API.
• Tells where the photographs come from, adds app/images.ts to the key files, and adds a troubleshooting row for missing photographs.
• Corrects the cost levers, the cost warning, the answers about what the factory builds and about the free tier, and the answer about a stuck run, which changed in Use Hono middleware in the gateway, and reconcile only failed tasks #27.
• Corrects three links that had paths from the root of the repository.

docs/README.md: corrects two links that pointed to ../FAQ.md.

Relation to #34

#34 changes the lines that tell what the deploy manager reads, in README.md, docs/README.md, and docs/FAQ.md. This change does not touch those lines. A trial merge of the two branches has no conflict.

Test plan

• Each link target exists: README.md#architecture-at-a-glance, docs/README.md#when-to-use-this-reference, docs/README.md#current-limitations, and docs/FAQ.md.
• A trial merge with Give the deploy manager the logs of each failed deploy #34 has no conflict.
• CI. The change is Markdown only, and npm run check does not read Markdown.

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