chore: add changeset for world-local optimizations

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Co-Authored-By: Claude <[email protected]>

Author: pranaygp

.changeset/brave-walls-trade.md

@@ -0,0 +1,9 @@
+---
+"@workflow/world-local": patch
+---
+
+perf: optimize for high-concurrency workflows
+
+- Add in-memory cache for file existence checks to avoid expensive fs.access() calls
+- Increase default concurrency limit from 20 to 100
+- Improve HTTP connection pooling with undici Agent (100 connections, 30s keepalive)