fix: full-removal canonical deletes + family-scoped migration gate

Two production-reported spine fixes:

- Canonical delete is a FULL removal: remove()/removeMany() deleted the
  metadata leg but never the canonical vectors.json leg or the <id>/
  directory, leaving ghost rows that inflated enumerated counts forever,
  read as damage scars, and caused duplicate readdir entries for
  re-created VFS paths (the stale-unpost path). The delete operation now
  routes through storage.deleteNoun — both legs + the entity container —
  with a full two-leg before-image rollback; deleteVerb symmetric; the
  blind 'no metadata file' catch that masked real faults is gone. The
  generation log still holds the delete's before-image, so asOf() history
  is unchanged. repairIndex() gains a conservative, loud orphan-prune
  sweep (containers with no metadata content leg) + count recompute for
  stores damaged by earlier versions.

- Family-scoped migration gate: every read blocked on the whole-brain
  migration lock even when the migrating index was irrelevant. The gate
  now scopes to the index families a read actually consults — canonical
  reads never wait; find() waits only on its query shape's families;
  graph traversals wait only on the graph family. Writes keep the
  conservative whole-brain wait. A read that needs the migrating family
  still blocks (bounded) with the retryable MigrationInProgressError.

src/transaction/operations/StorageOperations.ts

@@ -104,13 +104,26 @@ export class SaveNounOperation implements Operation {
 }
 
 /**
- * Delete noun metadata with rollback support
+ * Delete a noun — FULL canonical removal, with rollback support.
+ *
+ * Despite the historical name, this removes the WHOLE entity: both canonical
+ * legs (metadata + vector) AND the entity's container. Previously it deleted
+ * only the metadata leg via `deleteNounMetadata`, leaving the canonical
+ * `vectors.json` leg and the `<id>/` directory orphaned on disk — a "ghost"
+ * that reads as absent (getNoun needs both legs) yet inflates the enumerated
+ * count and can never be told apart from a damage scar. Routing through
+ * `storage.deleteNoun` removes both legs + the container in one place.
+ *
+ * Immutability is preserved: this cleans only the live-HEAD projection; the
+ * generation store retains the before-image so `asOf()` still reconstructs the
+ * deleted entity until retention expires.
  *
  * Rollback strategy:
- * - Restore deleted metadata
+ * - Restore BOTH legs from the before-image (vector leg raw, metadata leg via
+ *   the count-aware save so deleteNoun()'s decrement is reversed).
  */
 export class DeleteNounMetadataOperation implements Operation {
-  readonly name = 'DeleteNounMetadata'
+  readonly name = 'DeleteNoun'
 
   constructor(
     private readonly storage: StorageAdapter,
@@ -118,21 +131,34 @@ export class DeleteNounMetadataOperation implements Operation {
   ) {}
 
   async execute(): Promise<RollbackAction> {
-    // Get metadata before deletion (for rollback)
+    // Capture the FULL before-image (both legs) so the undo restores the whole
+    // entity — a metadata-only rollback would leave the vector leg unrestored.
+    const previousNoun = await this.storage.getNoun(this.id)
     const previousMetadata = await this.storage.getNounMetadata(this.id)
 
-    if (!previousMetadata) {
+    if (!previousNoun && !previousMetadata) {
       // Nothing to delete - no rollback needed
       return async () => {}
     }
 
-    // Delete metadata
-    await this.storage.deleteNounMetadata(this.id)
+    // Full removal: both canonical legs + the entity container + count decrement.
+    await this.storage.deleteNoun(this.id)
 
     // Return rollback action
     return async () => {
-      // Restore deleted metadata
-      await this.storage.saveNounMetadata(this.id, previousMetadata)
+      // Restore the vector leg, then the metadata leg through the count-aware
+      // save so deleteNoun()'s decrement is reversed.
+      if (previousNoun) {
+        await this.storage.saveNoun({
+          id: previousNoun.id,
+          vector: previousNoun.vector,
+          connections: previousNoun.connections || new Map(),
+          level: previousNoun.level || 0
+        })
+      }
+      if (previousMetadata) {
+        await this.storage.saveNounMetadata(this.id, previousMetadata)
+      }
     }
   }
 }