wcc: collapse exprfloatkind structural body onto checker stamp (#121)
wwstage exprfloatkind now reads n.type_ via classifytinfo (typeisf32→1,
typeisfloat→2, else 0) — wwstage classifies float-ness from the cstage-
equal stamp; delete the 9-arm structural body + the transient bridge.
Permanent residual sibling-evidence guards: cgbin float-arith (primary,
fires on unstamped float operand), tupstore + cgwidentaggedstore float
arms (pins, unreachable today, contract assertions against future
regression). cgcast excluded (int→float CVTSI2SD legitimately nil-typed).
Closes the gate-blind cs≠ww float family root (STATUS:14, named (b)-phase
goal). Builds on 98e1665 (A-narrow N_IDENT destructure stamp) +
1c4cea4 (transient floatness-disagreement bridge).
Hojun-Cho
0a2747ce5b