docs(perf): record rejected Array.find micro-optimization

.jules/bolt.md

@@ -61,3 +61,7 @@
 ## 2026-07-13 - Array.from mapping optimization
 **Learning:** Using `Array.from({ length: N }).map(...)` creates an intermediate array of `undefined` values which requires memory allocation and garbage collection, adding O(N) unnecessary overhead in frequently re-rendered UI components.
 **Action:** Use `Array.from({ length: N }, (_, index) => ...)` to map elements directly during array creation, avoiding intermediate allocations.
+
+## 2026-08-31 - Reject unmeasured Array.find micro-optimization
+**Learning:** Replacing `Array.prototype.find()` over four static progress entries with a manual loop removes a theoretical closure allocation but has no demonstrated product-level benefit and makes the bounded lookup less readable.
+**Action:** Keep idiomatic `Array.prototype.find()` for tiny bounded collections unless profiling or benchmark evidence shows a material latency or allocation problem; prefer measurable algorithmic improvements such as keyed caches for genuinely repeated large lookups.