Drop the Comp AI CRM acknowledgement

Nothing in PIG derives from that repository. The fact model, the leased
agent task queue and the `agentBrief` field are our own designs, and MIT's
attribution condition reaches copied source, not ideas — so the credit was
a courtesy that misstated where this code came from.

The one line worth keeping was never a credit: AGENTS.md's rule against
lifting component files out of somebody else's repo. It is restated
generically, and the shadcn-from-upstream guidance stays.

Buzz keeps its NOTICE entry.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

packages/db/src/schema/agent.ts

@@ -17,8 +17,6 @@
  *
  * 3. **Every outward action is idempotent.** `agentActions` carries a unique
  *    idempotency key, so a retried task cannot send the same message twice.
- *
- * The pattern is adapted from Comp AI CRM (MIT); see NOTICE.
  */
 import {
   index,