Added Cursor Cloud specific instructions to AGENTS.md

[jonatansberg]

What does this PR do?

Adds a ## Cursor Cloud specific instructions section to AGENTS.md with non-obvious development environment caveats discovered during Cloud Agent setup:

• Docker requirement: Documents that yarn dev requires Docker and that pre-building images prevents timeout issues
• Admin Vite race condition: The @tryghost/admin Vite dev server can fail on cold starts because it probes the Ghost backend before it's ready
• Key ports table: Quick reference for all dev server ports
• Testing notes: Clarifies which tests need Docker and which don't

Why?

Future Cursor Cloud agents need to know about these gotchas to set up the development environment reliably without trial-and-error.

Evidence of working environment

ghost-dev-environment-demo.mp4

Ghost frontend, admin panel, and post creation all working end-to-end.

Ghost homepage showing published post
Admin posts list

• I've read and followed the Contributor Guide
• I've explained my change
• N/A for automated tests (documentation-only change)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud