chore: run onboarding-audit-agent daily task

- Create started log
- Execute onboarding checks (npm ci, build, format, lint, test)
- Create completed log with audit report
- Clean up helper scripts

Co-authored-by: PR0M3TH3AN <[email protected]>

docs/agents/task-logs/daily/2026-02-13_20-06-02_onboarding-audit-agent_started.md

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+Started onboarding-audit-agent at 2026-02-13_20-06-02

docs/agents/task-logs/daily/2026-02-13_20-09-40_onboarding-audit-agent_completed.md

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+# Onboarding Audit Report
+
+Headline: ✓ Onboarding passes from clean checkout
+
+## 1) Environment assumptions
+- OS: Linux (Sandbox)
+- Node: v22.22.0
+- npm: 11.7.0
+
+## 2) Steps executed
+1. `npm ci`
+2. `npm run build`
+3. `npm run format`
+4. `npm run lint`
+5. `npm run test:unit:shard1`
+
+## 3) Results
+- `npm ci`: Pass
+- `npm run build`: Pass
+- `npm run format`: Pass
+- `npm run lint`: Pass
+- `npm run test:unit:shard1`: Pass
+
+## 4) Failures
+None.
+
+## 5) Docs changes made
+None.