Add windmill-specific harness, index, and task/golden templates

state/tasks/TEMPLATE.md

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+# Task Record Template
+
+- task_id: TASK-YYYYMMDD-001
+- date: YYYY-MM-DD
+
+## Request (3 lines)
+- Purpose:
+- Target:
+- Done:
+
+## Changed Files
+- path/to/file
+
+## Commands
+- cmd: 
+- result: success/fail
+- notes:
+
+## Verification
+- L1:
+- L2:
+- L3:
+
+## Risks / Next Actions
+-