Add AGENTS.md with Cursor Cloud development environment instructions

AGENTS.md

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+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+This is a **content/configuration monorepo** of Cursor IDE plugins. There is no backend, database, or build step. Each top-level directory is a standalone plugin with its own `.cursor-plugin/plugin.json` manifest.
+
+### Validation (the main "build/test/lint" step)
+
+```bash
+npm install --no-save ajv ajv-formats
+node scripts/validate-plugins.mjs
+```
+
+This validates all plugin manifests (JSON) against schemas in `schemas/`. It is the only CI check (see `.github/workflows/validate-plugins.yml`). Node.js >= 20 is required.
+
+### Hooks testing
+
+- **continual-learning** stop hook requires **Bun**: `echo '{"conversation_id":"x","status":"completed","loop_count":0}' | bun run continual-learning/hooks/continual-learning-stop.ts`
+- **ralph-loop** hooks require **bash** and **jq** (both pre-installed). The stop hook expects a state file at `.cursor/ralph/scratchpad.md`; without it, it exits cleanly.
+
+### Caveats
+
+- There is no `package.json` in the repo. Dependencies (`ajv`, `ajv-formats`) are installed ephemerally with `npm install --no-save`. The resulting `node_modules/` is gitignored.
+- No lockfile exists; `npm install --no-save` always fetches the latest compatible versions, matching CI behavior.