feat: salvage production audit skill (#1732)

skills/production-audit/SKILL.md

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+---
+name: production-audit
+description: Local-evidence production readiness audit for shipped apps, pre-launch reviews, post-merge checks, and "what breaks in prod?" questions without sending repo data to an external audit service.
+origin: community
+---
+
+# Production Audit
+
+Use this skill when the user asks whether an application is ready to ship, what
+could break in production, or what must be fixed before a launch. This is a
+maintainer-safe rewrite of the stale community production-audit idea: it keeps
+the useful production-readiness lens and removes unpinned external execution and
+third-party data sharing.
+
+## When to Use
+
+- The user asks "is this production-ready", "what would break in prod", "what
+  did we miss", "audit this repo", or "ready to ship?"
+- A feature was merged and needs a pre-deploy or post-merge risk pass.
+- A public launch, demo, customer rollout, or investor walkthrough is close.
+- CI is green but the user wants production risk, not only test status.
+- A deployed URL, release branch, PR, or current checkout is available for
+  evidence gathering.
+
+## When Not to Use
+
+- During active implementation when the right lens is line-level secure coding;
+  use `security-review` first.
+- For pure libraries, templates, docs-only repos, or scaffolds unless the user
+  wants packaging/release readiness rather than application readiness.
+- When the user asks for a formal compliance audit. This skill is engineering
+  triage, not legal, financial, medical, or regulatory certification.
+- When the only available evidence is a product idea with no repo, deployment,
+  CI, or runtime surface.
+
+## How It Works
+
+Build the audit from local and user-authorized evidence. Do not run unpinned
+remote code, upload repository contents to third-party services, or call
+external scanners unless the user explicitly approves that specific tool and
+data flow.
+
+Use this order:
+
+1. Establish the release surface.
+2. Read recent changes and current branch state.
+3. Inspect runtime, auth, data, payment, background-job, AI, and deployment
+   boundaries that actually exist in the repo.
+4. Check CI, tests, migrations, environment documentation, and rollback path.
+5. Produce a short ship/block recommendation with specific fixes.
+
+## Evidence Checklist
+
+Start with cheap, local signals:
+
+```text
+git status --short --branch
+git log --oneline --decorate -20
+git diff --stat origin/main...HEAD
+```
+
+Then inspect the project-specific surface:
+
+- Package scripts, CI workflows, release scripts, Docker files, and deployment
+  manifests.
+- API routes, webhooks, auth middleware, background workers, cron jobs, and
+  database migrations.
+- Environment variable documentation and startup checks.
+- Observability hooks, error reporting, logs, health checks, and dashboards.
+- Rollback, seed, migration, and backfill instructions.
+- E2E coverage for the user paths that matter most.
+
+If a deployed URL is in scope, use browser or HTTP checks only against that URL
+and avoid credentialed actions unless the user supplies a safe test account.
+
+## Risk Lenses
+
+### Security And Auth
+
+- Are public routes, API routes, and admin routes clearly separated?
+- Are auth and authorization enforced server-side?
+- Are secrets kept out of client bundles, logs, example output, and checked-in
+  files?
+- Are rate limits, CSRF protections, CORS policy, and upload validation present
+  where the app needs them?
+- Does the AI or agent surface defend against prompt injection, tool abuse, and
+  untrusted content crossing into privileged actions?
+
+### Data Integrity
+
+- Do migrations run forward cleanly and have a rollback or recovery plan?
+- Are destructive migrations, backfills, and data imports staged safely?
+- Do database policies, grants, and service-role boundaries match the app's
+  tenancy model?
+- Are retries idempotent for writes, jobs, and webhook handlers?
+
+### Payments And Webhooks
+
+- Are webhook signatures verified before parsing trusted payload fields?
+- Is each payment, subscription, or fulfillment webhook idempotent?
+- Are replay, duplicate delivery, and out-of-order delivery handled?
+- Are test-mode and live-mode credentials separated?
+
+### Operations
+
+- Can the app start from a clean checkout using documented commands?
+- Are required environment variables named, validated, and fail-fast?
+- Is there a health check that proves dependencies are reachable?
+- Are deploy, rollback, and incident-owner paths documented?
+- Are logs useful without leaking secrets or personal data?
+
+### User Experience
+
+- Are the launch-critical paths covered on desktop and mobile?
+- Are forms usable on mobile without input zoom, layout overlap, or blocked
+  submission states?
+- Do loading, empty, error, and permission-denied states tell the user what
+  happened?
+- Is there a support or recovery path when a critical operation fails?
+
+## Scoring
+
+Use scores to force prioritization, not to imply mathematical certainty.
+
+| Band | Score | Meaning |
+| --- | --- | --- |
+| Blocked | 0-49 | Do not ship until the top risks are fixed |
+| Risky | 50-69 | Ship only behind a small rollout or internal beta |
+| Launchable With Caveats | 70-84 | Ship if owners accept the listed risks |
+| Strong | 85-100 | No obvious launch blockers from available evidence |
+
+Cap the score at `69` if any of these are true:
+
+- Authentication or authorization is missing on sensitive data.
+- Payment or fulfillment webhooks are not idempotent.
+- Required migrations cannot be run safely.
+- Secrets are exposed in client bundles, logs, or committed files.
+- There is no rollback path for a high-impact release.
+
+Cap the score at `84` if CI is not green or the launch-critical path was not
+tested end to end.
+
+## Output Format
+
+Lead with one sentence:
+
+```text
+Production audit: 76/100, launchable with caveats, with webhook idempotency and rollback docs as the two risks to fix before public launch.
+```
+
+Then list:
+
+- `Blockers`: must-fix items before deploy.
+- `High-value fixes`: next fixes if the user wants to improve the score.
+- `Evidence checked`: files, commands, CI, deployed URL, or PRs inspected.
+- `Evidence missing`: what would change confidence if provided.
+- `Next action`: one concrete fix or verification step.
+
+Keep strengths short. The user asked for readiness, so the useful answer is the
+remaining risk and the next action.
+
+## Example
+
+User:
+
+```text
+is this ready to ship?
+```
+
+Response:
+
+```text
+Production audit: 68/100, risky, because Stripe webhooks are verified but not idempotent and there is no rollback note for the pending migration.
+
+Blockers:
+- Add idempotency for `checkout.session.completed` before fulfilling orders.
+- Write and test the rollback path for `20260511_add_billing_state.sql`.
+
+High-value fixes:
+- Add a health check that verifies database and payment-provider reachability.
+- Add one E2E path for upgrade, webhook fulfillment, and billing-page refresh.
+
+Evidence checked:
+- `api/stripe/webhook.ts`
+- `db/migrations/20260511_add_billing_state.sql`
+- GitHub Actions run for the release branch
+
+Next action: Want me to patch webhook idempotency first?
+```
+
+## Anti-Patterns
+
+- Running `npx <package>@latest` or a remote scanner as the default audit path.
+- Uploading source, secrets, customer data, or private topology to an external
+  audit service without explicit approval.
+- Producing a score without naming the evidence checked.
+- Treating green CI as production readiness.
+- Ending with a generic "let me know what you want to do."
+
+## See Also
+
+- Skill: `security-review`
+- Skill: `deployment-patterns`
+- Skill: `e2e-testing`
+- Skill: `tdd-workflow`
+- Skill: `verification-loop`