chore: import upstream snapshot with attribution

cli-tool/components/loops/engineering/production-error-sweep-loop.md

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+---
+name: production-error-sweep-loop
+description: Triages production errors, finds the root cause, ships a verified fix, and repeats until the error budget is clean.
+category: engineering
+interval: 15m
+stop-condition: No unresolved high-severity production errors remain and each fix is verified in tests.
+components: [agent:expert-advisors/debug, agent:security/incident-responder, command:git-workflow/create-pr]
+tags: [debugging, incidents, reliability, loop]
+---
+
+# Production Error Sweep Loop
+
+> **Loop Engineering** — keep an autonomous responder working the error queue, one root cause at a time, until production is quiet.
+
+## 🎯 Goal
+Continuously pull the top production error, find its **root cause** (not just the symptom), ship a tested fix, and verify the error stops recurring.
+
+## ⏱️ Schedule
+Suggested interval: `15m` (or trigger on new error alerts).
+
+## ▶️ Run it
+```
+/loop 15m "Take the highest-impact unresolved production error. Reproduce it, find the root cause, write a regression test, fix it, and open a PR. Continue until no high-severity errors remain."
+```
+
+## 🔁 Iteration steps
+1. **Perceive** — read the top error by impact (frequency × severity).
+2. **Reason** — reproduce and trace to the true root cause with the `debug` agent.
+3. **Plan** — design a minimal fix plus a regression test that fails first.
+4. **Act** — implement the fix; the `incident-responder` agent documents impact and mitigation.
+5. **Observe** — confirm the regression test passes, then open a PR with `/create-pr`.
+
+## 🛑 Stopping condition
+The high-severity error queue is empty and every fix is covered by a passing regression test.
+
+## 🧩 Referenced components
+- `agent:expert-advisors/debug` — root-cause analysis.
+- `agent:security/incident-responder` — impact assessment and mitigation notes.
+- `command:git-workflow/create-pr` — ships each fix for review.
+
+## 💡 Example
+A recurring null-pointer crash is traced to an unvalidated webhook payload; the loop adds a failing regression test, fixes the validation, verifies, and opens `fix: validate webhook payload before parse`.