brain: sponsored idents never train taste or appear in THE FIVE

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6897PWcUEwHiqZMcVnNF6

brain.js

@@ -91,7 +91,7 @@ function brainFor(rows) {
 }
 const brains = { all: null, station: null, stationId: "", rows: [] };
 async function rebuildBrains() {
-  const rows = await db.all(); brains.rows = rows;
+  const rows = (await db.all()).filter((t) => !(t.spec && t.spec.sponsored)); brains.rows = rows;
   brains.all = brainFor(rows);
   brains.stationId = state.stationId;
   brains.station = state.stationId ? brainFor(rows.filter((t) => t.spec.stationId === state.stationId)) : null;