[patch] Add AGENTS.md for Cursor Cloud dev environment setup

[deffenda]

Summary

Adds AGENTS.md with Cursor Cloud specific instructions to streamline development environment setup for future cloud agents.

Linked issue

N/A — environment setup, no linked issue.

Changes

• Added AGENTS.md with monorepo overview, Node.js version requirement, key commands reference, testing notes, build order, and external service requirements.

Acceptance criteria mirror

• AGENTS.md created with accurate dev environment instructions

Test plan

• npm run lint — zero warnings
• npm run typecheck — clean across all 4 workspaces
• npm test — 470 tests pass (446 extension + 15 designer-ui + 9 runtime-next)
• npm run build — all packages build successfully
• npm run package:check — VSIX packaging validates

Test output:
test_coverage_output.log

Changelog entry

• [INTERNAL] Add AGENTS.md with Cursor Cloud development environment instructions

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[Copilot]

Pull request overview

Adds a new AGENTS.md guide for Cursor Cloud agents to quickly understand and set up the repository’s development environment.

Changes:

• Documents the monorepo workspace layout and Node.js 20 requirement.
• Adds quick-reference commands for install, build, lint, typecheck, tests, packaging, and dev watch.
• Captures testing/build-order notes and confirms no external services are needed for standard checks.

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