Catalog: PHP BECs (no-var-dump, no-error-reporting-all) #66

Part of #25 (one language per PR). No code required — a catalog BEC is a single YAML file using the generic forbid check.

Task

Add ready-to-import PHP BECs under src/becwright/becs/:

• no-var-dump.bec.yaml — forbid var_dump( / print_r( debugging left in **/*.php.
• no-error-reporting-all.bec.yaml — forbid error_reporting(E_ALL) / display_errors enabled in committed code.

How

1. Copy the format from src/becwright/becs/no-debug-go.bec.yaml.
2. Write a real intent and why_it_matters.
3. Use check: "becwright run forbid --pattern '...'" with paths **/*.php.
4. Add the entries to src/becwright/becs/README.md.

Acceptance criteria

• pytest green (test_catalog_bundles_are_valid covers bundle parsing).
• becwright add no-var-dump installs it in a scratch repo.

See CONTRIBUTING.md → "Adding a catalog BEC".