docs: add CLAUDE.md for Claude Code

CLAUDE.md

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+# akeneo-table-attribute-bundle
+
+Symfony bundle that adds a "table" attribute type to Akeneo PIM 6.0, allowing products to carry multi-dimensional data as configurable column tables. Distributed as a Composer library (`flagbit/table-attribute-bundle`); installed inside an Akeneo PIM instance.
+
+## Tech Stack
+
+- **Language**: PHP 8.0
+- **Framework**: Symfony 5.4 (peer dependency via Akeneo), Doctrine
+- **Host platform**: Akeneo PIM Community Edition ^6.0
+- **Frontend**: JavaScript (RequireJS modules), LESS stylesheets
+- **Testing**: PHPSpec 7.2 (unit/spec), PHPUnit 9.0 (integration), Jest (frontend)
+- **Code quality**: PHP CodeSniffer (PSR-2), PHPLint, Scrutinizer CI
+
+## Repository Structure
+
+```
+src/                    Bundle source (PSR-4: Flagbit\Bundle\TableAttributeBundle\)
+  AttributeType/        Akeneo attribute type definitions
+  Component/            Core table value components
+  Controller/           Symfony controllers
+  DependencyInjection/  Bundle extension and configuration
+  Entity/               Doctrine entities
+  Form/                 Symfony form types
+  Http/                 HTTP utilities
+  Normalizer/           Akeneo normalizer implementations
+  Provider/             Service providers
+  Resources/            Config (services.xml), translations (EN/DE), JS/LESS assets
+  Validator/            Constraint validators and guesser
+spec/                   PHPSpec specifications (unit tests)
+tests/                  PHPUnit integration tests (TestKernel-based)
+jest/                   Jest frontend tests
+```
+
+## Local Development
+
+This is a library bundle — it is installed *inside* an existing Akeneo PIM instance, not run standalone. For isolated testing:
+
+**Prerequisites**: PHP 8.0, Composer, Node 12, Yarn
+
+```bash
+composer install
+yarn install
+```
+
+No `.env` file is required for running tests; the integration test kernel is self-contained.
+
+## Build / Test / Lint
+
+All commands run from the repository root after `composer install`.
+
+**PHP linting**
+```bash
+vendor/bin/phplint ./src
+```
+
+**Code style (PSR-2)**
+```bash
+vendor/bin/phpcs -d memory_limit=-1 --standard=PSR2 --extensions=php ./src
+```
+
+**PHPSpec (unit/spec)**
+```bash
+vendor/bin/phpspec run
+```
+
+**PHPUnit (integration)**
+```bash
+vendor/bin/phpunit
+```
+
+**Frontend tests (Jest)**
+```bash
+yarn run test
+# expands to: yarn update-extensions && jest --no-cache --config jest.config.js
+```
+
+CI runs all four steps on every push/PR via `.github/workflows/main.yml`.
+
+## Conventions
+
+- PSR-4 autoloading under namespace `Flagbit\Bundle\TableAttributeBundle\`
+- Code style: PSR-2 (enforced by phpcs.xml)
+- Unit specs live in `spec/`, integration tests in `tests/`
+- Translations in `src/Resources/translations/` for `en` and `de` locales
+- Versioned changelogs per major release: `CHANGELOG-<major>.<minor>.md`
+- Conventional Commits for commit messages
+
+## Gotchas / Notes
+
+- Requires `akeneo/pim-community-dev ^6.0` as a peer dependency — the bundle cannot be tested without Composer installing the full Akeneo PIM vendor tree (large download).
+- Frontend tests depend on Akeneo's own Node workspace being present in `vendor/akeneo/pim-community-dev`; run `yarn install` with workspaces to populate it.
+- `package.json` declares `"private": true` and configures Yarn workspaces pointing into the Akeneo vendor directory — this is intentional for test setup, not a standalone app.
+- PHPSpec config (`phpspec.yml` or inline) and PHPUnit config (`phpunit.xml.dist`) are the authoritative sources for test suites; a `phpunit.xml.dist.bak` exists as a backup, do not use it.