[AndrewKirkovski]

Problem and resulting behavior

building-modules/frontend.md had no guidance on lazy loading. It now covers the entry shape, which loader fits which surface, the error contract, and the build settings that keep ?declare-tag= and factory loading working.

Validation

Documentation only. The text matches the behavior in the matching kickside and module changes, and it was reviewed with them.

Checklist

• I followed the contribution guide and any repository-specific instructions.
• Relevant build and lint checks pass.
• Tests cover changed behavior. No code changes.
• UI source and regenerated tracked served assets are included together, where applicable.
• Documentation and links describe the resulting behavior accurately.
• No credentials, private data, or generated local runtime state are included.
• The CLA check passes, or my GitHub account is already recorded or allowlisted.