The TPL-008 rule was only in the single-file validation path,
not in the full project validation. Added it to _validate_templates().
Fixed invalid block names:
- customers.html: page_scripts → extra_scripts
- notifications.html: page_scripts → extra_scripts
- test-vendors-users-migration.html: scripts → extra_scripts
- test-auth-flow.html: scripts → extra_scripts
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>