docs: create milestone v2.0 roadmap (3 phases)

Phases:
7. GitOps Foundation: ArgoCD installation and configuration
8. Observability Stack: Prometheus/Grafana/Loki + alerts
9. CI Pipeline Hardening: Vitest, Playwright, type checking

All 17 requirements mapped to phases.

.planning/STATE.md

@@ -5,16 +5,16 @@
 See: .planning/PROJECT.md (updated 2026-02-01)
 
 **Core value:** Capture and find anything from any device — especially laptop. If cross-device capture with images doesn't work, nothing else matters.
-**Current focus:** v2.0 Production Operations — CI/CD pipeline and observability
+**Current focus:** v2.0 Production Operations — Phase 7 (GitOps Foundation)
 
 ## Current Position
 
-Phase: Not started (researching)
-Plan: —
-Status: Defining requirements
-Last activity: 2026-02-03 — Milestone v2.0 started
+Phase: 7 of 9 (GitOps Foundation)
+Plan: 0 of 2 in current phase
+Status: Ready to plan
+Last activity: 2026-02-03 — Roadmap created for v2.0
 
-Progress: Research → Requirements → Roadmap
+Progress: [██████████████████░░░░░░░░░░░░] 67% (v1.0 complete, v2.0 starting)
 
 ## Performance Metrics
 
@@ -25,6 +25,11 @@ Progress: Research → Requirements → Roadmap
 - Phases: 6
 - Requirements satisfied: 31/31
 
+**v2.0 Target:**
+- Phases: 3 (7-9)
+- Plans estimated: 7
+- Requirements: 17
+
 **By Phase (v1.0):**
 
 | Phase | Plans | Total | Avg/Plan |
@@ -42,11 +47,15 @@ Progress: Research → Requirements → Roadmap
 
 Key decisions from v1.0 are preserved in PROJECT.md.
 
-For v2, new decisions will be logged here as work progresses.
+For v2.0, key decisions from research:
+- Use Grafana Alloy (not Promtail - EOL March 2026)
+- ArgoCD needs server.insecure: true for Traefik TLS termination
+- Loki monolithic mode with 7-day retention
+- Vitest for unit tests (official Svelte recommendation)
 
 ### Pending Todos
 
-None — ready for next milestone.
+None — ready for Phase 7 planning.
 
 ### Blockers/Concerns
 
@@ -54,10 +63,10 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-02-01
-Stopped at: Completed milestone v1.0
+Last session: 2026-02-03
+Stopped at: Roadmap v2.0 created
 Resume file: None
 
 ---
 *State initialized: 2026-01-29*
-*Last updated: 2026-02-01 — Milestone v1.0 archived*
+*Last updated: 2026-02-03 — v2.0 roadmap created*