chore(debug): add -ddump-if-trace to inter-hub-models to diagnose GHC crash

All 477 modules compile successfully but GHC panics at position 287,686,318
during finalization. Trace will show which .hi file is being read at crash time.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flake.nix

@@ -124,6 +124,7 @@
                                            configureFlags = (old.configureFlags or []) ++ [
                                                "--ghc-option=-O0"
                                                "--ghc-option=-fomit-interface-pragmas"
+                                               "--ghc-option=-ddump-if-trace"
                                            ];
                                            postUnpack = (old.postUnpack or "") + ''
                                                _actual="$sourceRoot/build/Generated/ActualTypes.hs"