feat: add typed Poimen REST endpoints and wire workflow types (#32, #34)

- New internal/temporal/poimen.go: PoimenHandler with typed REST endpoints
  POST /v1/poimen/plan — call PlannerActivity (stub until workflows#23)
  POST /v1/poimen/execute — start DAG/Orchestrator/Routing workflows
  GET  /v1/poimen/executions — list Poimen workflow executions
  GET  /v1/poimen/executions/:id — describe execution
  GET  /v1/poimen/executions/:id/history — activity event history
  GET  /v1/poimen/executions/:id/stream — SSE events (delegates to sse.go)
  POST /v1/poimen/executions/:id/signal — pause/resume/cancel
  DELETE /v1/poimen/executions/:id — terminate workflow
- New internal/serviceadapter/poimen_adapter.go: ServiceAdapter spec + factory
- Wire PoimenHandler in cmd/gateway/main.go via ServiceAdapter registry
- Workflow type registry: dag->DAGWorkflow, orchestrator->OrchestratorWorkflow,
  routing->RoutingWorkflow (all on poimen-worker task queue)

Closes #32
Closes #34

.gitea/workflows/ci.yaml

@@ -32,7 +32,7 @@ jobs:
         run: go vet ./...
 
       - name: Go test
-        run: go test -short ./...
+        run: go test ./...
 
       - name: Get short SHA
         id: sha
@@ -67,7 +67,7 @@ jobs:
         run: |
           mkdir -p ~/.kube
           echo "${KUBECONFIG_B64}" | base64 -d > ~/.kube/config
-          kubectl get namespaces --no-headers | head -1
+          kubectl get nodes --no-headers | head -1
           echo '✓ kubeconfig works'
         env:
           KUBECONFIG_B64: ${{ secrets.KUBECONFIG_B64 }}
@@ -157,12 +157,8 @@ jobs:
         if: always() && github.event_name == 'push' && github.ref == 'refs/heads/main'
         run: |
           POD_NAME="${{ steps.canary.outputs.pod_name }}"
-          if [ -n "${POD_NAME}" ]; then
-            kubectl delete pod "${POD_NAME}" -n api --ignore-not-found || true
-            echo "✓ Canary pod removed"
-          else
-            echo "⚠ No canary pod to clean up (name was empty)"
-          fi
+          kubectl delete pod "${POD_NAME}" -n api --ignore-not-found || true
+          echo "✓ Canary pod removed"
 
       - name: Gate on test result
         if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.tests.outputs.result != 'pass'