feat(go-process): add CLI test Taskfile for build and unit test validation (AX-10)

Adds tests/cli/process/Taskfile.yaml with canonical build/test/vet/default
targets plus test-unit and Unix-gated test-integration (real subprocess tests
skipped on windows). default deps-chains build/test/vet per Wave 2 convention.

Co-authored-by: Codex <noreply@openai.com>
Via-codex-lane: supervised by Cerberus on Athena #103 request
Closes tasks.lthn.sh/view.php?id=302

tests/cli/process/Taskfile.yaml

@@ -0,0 +1,38 @@
+version: "3"
+
+tasks:
+  build:
+    dir: ../../..
+    cmds:
+      - go build ./...
+
+  test:
+    dir: ../../..
+    cmds:
+      - go test -count=1 -race ./...
+
+  vet:
+    dir: ../../..
+    cmds:
+      - go vet ./...
+
+  test-unit:
+    dir: ../../..
+    cmds:
+      - go test -count=1 -race ./... -run Unit
+
+  test-integration:
+    dir: ../../..
+    cmds:
+      - |
+        if [ "$(go env GOOS)" = "windows" ]; then
+          echo "skipping integration tests on windows"
+        else
+          go test -count=1 ./... -run Integration -tags integration
+        fi
+
+  default:
+    deps:
+      - build
+      - test
+      - vet