Cleanup pass to remove refactoring-related artifacts and references

internal/framework/contracts/chunk_proposal_composition_test.go

@@ -13,7 +13,7 @@ import (
 
 // testChunkProposalHarness is a test-only helper that composes existing
 // deterministic chunking and proposal-application primitives.
-// Production runner orchestration is implemented in later phases.
+// It isolates proposal/composition behavior from full runner orchestration.
 type testChunkProposalHarness struct {
 	module TranscriptModule
 }