chore(agents): Consolidate SDK dev rules into AGENTS.md

AGENTS.md

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+# Sentry JavaScript SDK
+
+Monorepo with 40+ packages in `@sentry/*`, managed with Yarn workspaces and Nx.
+
+## Setup
+
+- [Volta](https://volta.sh/) for Node.js/Yarn/PNPM version management
+- Requires `VOLTA_FEATURE_PNPM=1`
+- After cloning: `yarn install && yarn build`
+- Never change Volta, Yarn, or package manager versions unless explicitly asked
+
+## Package Manager
+
+Use **yarn**: `yarn install`, `yarn build:dev`, `yarn test`, `yarn lint`
+
+| Command                               | Purpose                       |
+| ------------------------------------- | ----------------------------- |
+| `yarn build`                          | Full production build         |
+| `yarn build:dev`                      | Dev build (transpile + types) |
+| `yarn build:dev:filter @sentry/<pkg>` | Build one package + deps      |
+| `yarn build:bundle`                   | Browser bundles only          |
+| `yarn test`                           | All unit tests                |
+| `yarn lint`                           | ESLint + Oxfmt                |
+| `yarn fix`                            | Auto-fix lint + format        |
+| `yarn format`                         | Auto-fix formatting (Oxfmt)   |
+
+Single package: `cd packages/<name> && yarn test`
+
+## Commit Attribution
+
+AI commits MUST include:
+
+```
+Co-Authored-By: <agent model name> <noreply@anthropic.com>
+```
+
+## Git Workflow
+
+Uses **Git Flow** (see `docs/gitflow.md`).
+
+- **All PRs target `develop`** (NOT `master`)
+- `master` = last released state — never merge directly
+- Feature branches: `feat/descriptive-name`
+- Never update dependencies, `package.json`, or build scripts unless explicitly asked
+
+## Before Every Commit
+
+1. `yarn format`
+2. `yarn lint`
+3. `yarn test`
+4. `yarn build:dev`
+5. NEVER push on `develop`
+
+## Architecture
+
+### Core
+
+- `packages/core/` — Base SDK: interfaces, types, core functionality
+- `packages/types/` — Shared types (**deprecated, never modify – instead find types in packages/core**)
+- `packages/browser-utils/` — Browser utilities and instrumentation
+- `packages/node-core/` — Node core logic (excludes OTel instrumentation)
+
+### Platform SDKs
+
+- `packages/browser/` — Browser SDK + CDN bundles
+- `packages/node/` — Node.js SDK (OTel instrumentation on top of node-core)
+- `packages/bun/`, `packages/deno/`, `packages/cloudflare/`
+
+### Framework Integrations
+
+- `packages/{framework}/` — React, Vue, Angular, Next.js, Nuxt, SvelteKit, Remix, etc.
+- Some have client/server entry points (nextjs, nuxt, sveltekit)
+
+### AI Integrations
+
+- `packages/core/src/tracing/{provider}/` — Core instrumentation
+- `packages/node/src/integrations/tracing/{provider}/` — Node.js integration + OTel
+- `packages/cloudflare/src/integrations/tracing/{provider}.ts` — Edge runtime
+- See `.cursor/rules/adding-a-new-ai-integration.mdc` for implementation guide
+
+### User Experience
+
+- `packages/replay-internal/`, `packages/replay-canvas/`, `packages/replay-worker/` — Session replay
+- `packages/feedback/` — User feedback
+
+### Dev Packages (`dev-packages/`)
+
+- `browser-integration-tests/` — Playwright browser tests
+- `e2e-tests/` — E2E tests (70+ framework combos)
+- `node-integration-tests/` — Node.js integration tests
+- `test-utils/` — Shared test utilities
+- `rollup-utils/` — Build utilities
+
+## Coding Standards
+
+- Follow existing conventions — check neighboring files
+- Only use libraries already in the codebase
+- Never expose secrets or keys
+- When modifying files, cover all occurrences (including `src/` and `test/`)
+
+## Skills
+
+### E2E Testing
+
+Use `/e2e` skill to run E2E tests. See `.claude/skills/e2e/SKILL.md`
+
+### Security Vulnerabilities
+
+Use `/fix-security-vulnerability` skill for Dependabot alerts. See `.claude/skills/fix-security-vulnerability/SKILL.md`
+
+### Issue Triage
+
+Use `/triage-issue` skill. See `.claude/skills/triage-issue/SKILL.md`
+
+### CDN Bundles
+
+Use `/add-cdn-bundle` skill. See `.claude/skills/add-cdn-bundle/SKILL.md`