Elaborate bare Grammar-v1 Frame types exactly

[abiggerhammer]

Summary

Continue Matrix SURF-008 / ledger PHIL-SURFACE-ELAB-001 with exact source-to-Core routing for Grammar-v1 Frame[...] types whose grammar reference is unspecialized.

Contract

• a bare or qualified unspecialized Grammar-v1 grammar reference preserves its source-qualified spelling exactly as Core GrammarId inside TyFrame;
• this follows the established surface elaborator contract (Frame[Hello] -> TyFrame (GrammarId "Hello")) without introducing a new semantic category;
• specialized grammar references fail closed because Core GrammarId has no carrier for static arguments and flattening them would erase semantically relevant source information;
• non-Frame types remain outside this bridge;
• grammar existence, category competence, and any later specialization semantics remain competent semantic-checker responsibilities.

Executable pressure

Phase1GrammarV1BareFrameTypeElaborationMain.hs parses Frame[Hello] and Frame[Wire.Codec] and requires exact Core grammar identity. Frame[Wire.Codec[U32]] and a non-Frame type are negative pressure and must remain unresolved.

This is the fifteenth bounded SURF-008 slice after #462, #464, #466, #468, #471, #474, #477, #478, #481, #482, #485, #486, #488, and #489; full Grammar-v1 elaboration correspondence remains open.