docs(_bulk-helpers): customer/bulk now uses the factory — drop stale "predates" callout (#250)

The header JSDoc on \`_bulk-helpers.js\` said:

  "Customer's bulkCreate predates this helper and has the same shape
   baked in; we don't migrate it here to keep the diff focused on the
   new endpoints (P3-H), but a follow-up should consolidate them."

That follow-up landed; \`customercontroller.js\` now exports
\`bulkCreate = makeBulkCreate({ ... })\` like every other bulk-direct
endpoint, and Customer is among the 6 entities the factory serves.
The "5 near-identical controllers it replaces" line was also off by
one for the same reason.

Update both lines to match reality: 6 entities use the factory,
Customer was migrated in a follow-up after the original P3-H rollout.

Co-authored-by: Aaron K. Clark <akclark@thenetwerk.net>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

app/controllers/_bulk-helpers.js

@@ -4,15 +4,15 @@
 
 /**
  * Shared factory for bulk-create controllers on entities that scope
- * directly to a single company via a *CompId column. Customer's
- * bulkCreate predates this helper and has the same shape baked in;
- * we don't migrate it here to keep the diff focused on the new
- * endpoints (P3-H), but a follow-up should consolidate them.
+ * directly to a single company via a *CompId column.
  *
- * What this factory replaces: 5 near-identical controllers
- * (worker/billingtype/inventoryitem/inventorytransaction/
+ * What this factory replaces: 6 near-identical controllers
+ * (customer/worker/billingtype/inventoryitem/inventorytransaction/
  *  purchaseordervendor) each repeating the same auth-scope-loop-
- *  transaction-bulkCreate-handle-error scaffold.
+ *  transaction-bulkCreate-handle-error scaffold. Customer was the
+ *  original hand-rolled implementation; the factory replaced 5
+ *  later-added clones in P3-H and Customer was migrated to use the
+ *  factory in a follow-up.
  *
  * What varies between entities — passed as config:
  *   - Model         the sequelize model (db.Worker etc.)