PR-002.5: Application Layer — Command/Result pattern, end-to-end flow

- 8 commands (CreateFieldSession, CreateMission, RegisterArtifact,
  CreateObservation, CreateDecisionCase, ApproveDecision, StartReview,
  CompleteReview)
- 4 handlers with validation and orchestration
- Result<T, E> pattern — explicit success/failure, no exceptions
- End-to-end test: Session → Mission → DecisionCase → Approval
- 3 tests proving full flow works in memory
- ADR-007: Command/Result Pattern

Acceptance Criteria:
✅ CreateFieldSession → CreateMission → CreateDecisionCase → ApproveDecision
✅ Without PostgreSQL, Redis, S3, API, HTTP, UI
✅ Business logic verified before infrastructure attached

Next: PR-003 — PostgreSQL adapters (swap InMemory → Postgres)

packages/application/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@landvex/application",
+  "version": "0.1.0",
+  "description": "Application layer and use cases for LandveX domain",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "test": "jest",
+    "test:watch": "jest --watch"
+  },
+  "dependencies": {
+    "@landvex/domain": "file:../domain",
+    "@landvex/infrastructure": "file:../infrastructure"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.5.0",
+    "@types/node": "^20.0.0",
+    "jest": "^29.5.0",
+    "ts-jest": "^29.1.0",
+    "typescript": "^5.3.0"
+  }
+}