Unbreak regen after #6242: registry partition + .dag comment parse wall

src/v1/dag_collect.dag

@@ -122,7 +122,6 @@ fn dag_collect_insert_slots(node: Node, slots: Map<String, DagCollectSlot>, coll
     Present { value: _ } => slots
     Absent => {
       let fp = if anchor.span.start == 0 && anchor.span.end == 0 {
-        // Synthetic keys embed the fingerprint; Absent branch must not re-hash.
         substring(s: key, start: 6, end: string_length(s: key))
       } else {
         dag_node_fingerprint(node: anchor)
@@ -144,8 +143,6 @@ fn dag_collect_from_module(module: TypedModule, slots: Map<String, DagCollectSlo
 
 fn collect_dag_nodes(typed: ResolvedGraph) -> DagCollectAcc {
   let _memo_reset = dag_collect_fp_memo_reset()
-  // Dissolve-on: drop collision_errors threading once synthetic-key construction proof
-  // is a typed wall (key embeds fp ⇒ key-equal ⇒ fp-equal); kept for emit_dag gate shape.
   let collision_errors = []
   let slots = typed.modules
     |> fold(init: empty_map(), f: (s, m) => dag_collect_from_module(module: m, slots: s, collision_errors: collision_errors))

src/v1/dag_collect_support.dag

@@ -118,9 +118,6 @@ fn dag_node_surface_fingerprint(node: Node) -> String {
   dag_node_surface_fingerprint_rec(node: node)
 }
 
-// Dissolve-on: ground on std.content_hash + node-keyed memo table once v2 adoption
-// clears for this stage. Realization threads a per-collect memo reset at
-// collect_dag_nodes entry; Rust seed uses Rc::as_ptr until then.
 fn dag_collect_fp_memo_reset() -> Bool {
   true
 }

src/v1/stage0/src/bin/regen_stage0.rs

@@ -73,8 +73,6 @@ const GENERATED_STAGE0_FILES: &[&str] = &[
     "v1_compiler_compile.rs",
     "v1_compiler_compiler_tests_rust.rs",
     "v1_compiler_complexity.rs",
-    "v1_compiler_dag_collect.rs",
-    "v1_compiler_dag_collect_support.rs",
     "v1_compiler_effect_derivation.rs",
     "v1_compiler_emit.rs",
     "v1_compiler_emit_core_support.rs",
@@ -133,6 +131,15 @@ const HAND_MAINTAINED_STAGE0_FILES: &[&str] = &[
     // regen is unblocked (04_resolve.dag) and std.content_hash memo rows emit. Regen without
     // this guard reverted to DagCollectPending / O(M²) three times (90ad8fa, 42c8f3d, …).
     // Dissolution: regen_stage0 --verify green with .dag model = emitted seed; drop from here.
+    // Re-homed dissolution triggers from the (unparseable) .dag comments #6242 added:
+    //  - dag_collect_support.dag fp memo: ground dag_node_surface_fingerprint_memo on
+    //    std.content_hash + a node-keyed memo table once v2 adoption clears for this stage
+    //    (realization threads a per-collect memo reset at collect_dag_nodes entry; the Rust
+    //    seed uses Rc::as_ptr until then).
+    //  - dag_collect.dag collision_errors threading: drop once synthetic-key construction
+    //    proof is a typed wall (key embeds fp => key-equal => fp-equal); kept for the
+    //    emit_dag gate shape. Synthetic keys embed the fingerprint; the Absent branch must
+    //    not re-hash.
     "v1_compiler_dag_collect.rs",
     "v1_compiler_dag_collect_support.rs",
 ];