test(budgets): iron-honest wall-clock budgets — 3x the worst honest-iron measurement

Seven micro-budget tests were calibrated on one fast desktop and failed on
other honest iron with zero functional failures (bisect-proven pre-existing;
David-waived for 10.1/10.2 with this recalibration filed as the cure). Every
budget is now at least 3x the worst measurement observed across three
machines, each with a comment naming its calibration basis; the find-unified
micro-comparison of two sub-millisecond timings becomes a ratio assertion
(absolute equality of microsecond pairs can never be stable). The
inference-bound trim-history correctness test gets a timeout covering its
slowest observed run (174s) — its assertions are exact and untouched.

These remain order-of-magnitude guards; real perf enforcement lives in the
dedicated perf lanes with iron-specific budgets, per the gate-speed standard.

Known non-test artifact, documented not hidden: on slow-inference machines a
minutes-long awaited-embed loop can trip vitest's worker-RPC 60s tolerance
('Timeout calling onTaskUpdate') — all tests pass, vitest exits 1 on the
unhandled orchestration error. The CI lanes on faster iron exit clean; if a
lane ever trips it, the test moves to deterministic embeddings (its
assertions are size-bookkeeping, not embedding quality).

tests/unit/brainy/batch-operations.test.ts

@@ -456,7 +456,9 @@ describe('Brainy Batch Operations', () => {
       // Verify batch operation completed successfully
       // Note: Performance can vary based on system load and embedding generation
       expect(batchIds).toHaveLength(itemCount)
-      expect(batchTime).toBeLessThan(5000) // Reasonable timeout for 50 items
+      // order-of-magnitude guard: worst honest-iron measurement 11.9s (CPU-only
+      // inference, 32-core box), 3x headroom for 50-item batch
+      expect(batchTime).toBeLessThan(40000)
 
       console.log(`Individual: ${individualTime}ms, Batch: ${batchTime}ms`)
       if (batchTime < individualTime) {
@@ -510,7 +512,9 @@ describe('Brainy Batch Operations', () => {
 
       const totalTime = Date.now() - startTime
 
-      expect(totalTime).toBeLessThan(3000) // v5.4.0: Type-first storage takes longer
+      // order-of-magnitude guard: worst honest-iron measurement 6652ms
+      // (mixed batch under CPU-only inference), 3x headroom
+      expect(totalTime).toBeLessThan(20000)
       
       // Verify final state
       const remaining = await brain.get(initialIds[0])
@@ -556,7 +560,12 @@ describe('Brainy Batch Operations', () => {
         // Might throw if there's a limit
         expect(error).toBeDefined()
       }
-    }, 60000)
+      // order-of-magnitude guard: this test batches 20x the item count of the
+      // sibling "perform better" test above (worst measured 11.9s for 50
+      // items on CPU-only honest iron); the prior 60s timeout was itself
+      // observed being hit, so this is 3x that floor rather than a scaled
+      // extrapolation, to leave real headroom for run-to-run variance
+    }, 180000)
     
     it('should provide meaningful error messages', async () => {
       try {