fix(agents): Add pre-delegation checkpoint protocol to tier3-worker

.opencode/agents/tier3-worker.md

@@ -65,6 +65,16 @@ You MUST use Manual Slop's MCP tools. Native OpenCode tools are unreliable.
 |-------------|----------|
 | `bash` | `manual-slop_run_powershell` |
 
+## Pre-Delegation Checkpoint Protocol (MANDATORY)
+
+Before implementing ANY code change:
+
+1. **Stage your work:** `manual-slop_run_powershell` with `git add .`
+2. **Why:** Prevents work loss if the implementation fails or needs rollback
+3. **When:** Always - before touching any file that matters
+
+This is NOT optional. It is the difference between recoverable and catastrophic failure.
+
 ## Task Start Checklist (MANDATORY)
 
 Before implementing: