✨feature: Initial MVP

AGENTS.md

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+# Working Agreements
+
+## 1. Code Style & Quality
+
+- PHP: PHPCS with my custom coding standards (`phpcs.xml`), PHPStan level ≥ 6.
+- JS: ESLint (airbnb/base), Prettier.
+- Commits: Conventional Commits.
+- Branches: main (stable), develop, feature branches → PRs.
+- CI Required Checks: lint, static analysis, unit/integration tests, e2e (smoke), composer validate. No merge to main without green.
+
+## 2. Security Model
+
+- Nonces on all state‑changing forms/requests; verify before mutate.
+- Always sanitize input and escape output.
+
+## 3. Build & Tooling
+
+Composer dev deps (suggested):
+
+- dealerdirect/phpcodesniffer-composer-installer
+- squizlabs/php_codesniffer
+- phpstan/phpstan
+- phpunit/phpunit