Finish Structural Families Macro

Goal

• Close Macro Task 2 at the planning layer.

Scope

• Mark the current structural family freeze boundary explicitly.
• Stop treating deeper structural growth as the default queue.
• Push unsupported or migration-unforced structural semantics out of the active macro-task surface.

Phases

• Restate the actual proved structural surface
• Patch the roadmap/docs to mark Macro Task 2 done enough
• Verify the touched docs