docs: define milestone v2.0 requirements

17 requirements across 3 categories:
- GitOps: 4 (ArgoCD installation and configuration)
- Observability: 8 (Prometheus/Grafana/Loki stack + app metrics)
- CI Testing: 5 (Vitest, Playwright, type checking)

.planning/REQUIREMENTS.md

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+# Requirements: TaskPlanner v2.0
+
+**Defined:** 2026-02-03
+**Core Value:** Production-grade operations — reliable deployments and visibility into system health
+
+## v2.0 Requirements
+
+Requirements for milestone v2.0 Production Operations. Each maps to roadmap phases.
+
+### GitOps
+
+- [ ] **GITOPS-01**: ArgoCD server installed and running in cluster
+- [ ] **GITOPS-02**: ArgoCD syncs TaskPlanner deployment from Git automatically
+- [ ] **GITOPS-03**: ArgoCD self-heals manual changes to match Git state
+- [ ] **GITOPS-04**: ArgoCD UI accessible via Traefik ingress with TLS
+
+### Observability
+
+- [ ] **OBS-01**: Prometheus collects metrics from cluster and applications
+- [ ] **OBS-02**: Grafana displays dashboards with cluster metrics
+- [ ] **OBS-03**: Loki aggregates logs from all pods
+- [ ] **OBS-04**: Alloy DaemonSet collects pod logs and forwards to Loki
+- [ ] **OBS-05**: Grafana can query logs via Loki datasource
+- [ ] **OBS-06**: Critical alerts configured (pod crashes, disk full, app down)
+- [ ] **OBS-07**: Grafana UI accessible via Traefik ingress with TLS
+- [ ] **OBS-08**: TaskPlanner exposes /metrics endpoint for Prometheus
+
+### CI Testing
+
+- [ ] **CI-01**: Vitest installed and configured for unit tests
+- [ ] **CI-02**: Unit tests run in Gitea Actions pipeline before build
+- [ ] **CI-03**: Type checking (svelte-check) runs in pipeline
+- [ ] **CI-04**: E2E tests (Playwright) run in pipeline
+- [ ] **CI-05**: Pipeline fails fast on test/type errors before build
+
+## Future Requirements
+
+Deferred to later milestones.
+
+### Observability Enhancements
+
+- **OBS-F01**: k3s control plane metrics (scheduler, controller-manager)
+- **OBS-F02**: Traefik ingress metrics integration
+- **OBS-F03**: SLO/SLI dashboards with error budgets
+- **OBS-F04**: Distributed tracing
+
+### CI Enhancements
+
+- **CI-F01**: Vulnerability scanning (Trivy, npm audit)
+- **CI-F02**: DORA metrics tracking
+- **CI-F03**: Smoke tests on deploy
+
+### GitOps Enhancements
+
+- **GITOPS-F01**: Gitea webhook integration (faster sync)
+
+## Out of Scope
+
+Explicitly excluded — overkill for single-user personal project.
+
+| Feature | Reason |
+|---------|--------|
+| Multi-environment promotion | Single user, single environment; deploy directly to prod |
+| Blue-green/canary deployments | Complex rollout unnecessary for personal app |
+| ArgoCD high availability | HA for multi-team, not personal projects |
+| ELK stack | Resource-heavy; Loki is lightweight alternative |
+| Vault secrets management | Kubernetes secrets sufficient for personal app |
+| OPA policy enforcement | Single user has no policy conflicts |
+
+## Traceability
+
+Which phases cover which requirements. Updated during roadmap creation.
+
+| Requirement | Phase | Status |
+|-------------|-------|--------|
+| GITOPS-01 | — | Pending |
+| GITOPS-02 | — | Pending |
+| GITOPS-03 | — | Pending |
+| GITOPS-04 | — | Pending |
+| OBS-01 | — | Pending |
+| OBS-02 | — | Pending |
+| OBS-03 | — | Pending |
+| OBS-04 | — | Pending |
+| OBS-05 | — | Pending |
+| OBS-06 | — | Pending |
+| OBS-07 | — | Pending |
+| OBS-08 | — | Pending |
+| CI-01 | — | Pending |
+| CI-02 | — | Pending |
+| CI-03 | — | Pending |
+| CI-04 | — | Pending |
+| CI-05 | — | Pending |
+
+**Coverage:**
+- v2.0 requirements: 17 total
+- Mapped to phases: 0
+- Unmapped: 17 ⚠️
+
+---
+*Requirements defined: 2026-02-03*
+*Last updated: 2026-02-03 after initial definition*