ci: bump TinyGo to 0.41.0 in the refactor-harness gate

Updates the TinyGo amd64 build gate from 0.34.0. No Go-version conflict
(0.41.0 supports the go.mod 1.23.0); the gate script has no separate pin.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: pgodwin

.github/workflows/refactor-harness.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Setup TinyGo
         uses: acifani/setup-tinygo@v2
         with:
-          tinygo-version: "0.34.0"
+          tinygo-version: "0.41.0"
 
       - name: Run TinyGo amd64 build gates
         shell: bash