ci: add Go build/test job, re-enable frontend coverage, clean up temp files

- Add go-build job to deploy.yml that builds and tests cmd/server and cmd/ingestor
- Go job gates the Node.js test job and deploy job
- Re-enable frontend coverage detection (was hardcoded to false)
- Remove stale temp files from repo root (recover-delta.sh, merge.sh, replacements.txt, reps.txt)
- Add temp scripts and Go build artifacts to .gitignore

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -14,7 +14,23 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  go-build:
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+
+      - name: Build & test Go server
+        run: cd cmd/server && go build . && go test ./...
+
+      - name: Build & test Go ingestor
+        run: cd cmd/ingestor && go build . && go test ./...
+
   test:
+    needs: go-build
     runs-on: self-hosted
     steps:
       - uses: actions/checkout@v4
@@ -40,9 +56,8 @@ jobs:
           # If test files changed, run everything
           if [ "$TESTS" -gt 0 ]; then BACKEND=1; FRONTEND=1; fi
           echo "backend=$([[ $BACKEND -gt 0 ]] && echo true || echo false)" >> $GITHUB_OUTPUT
-          # Frontend coverage temporarily disabled — 169 blind sleeps = 13min CI
-          echo "frontend=false" >> $GITHUB_OUTPUT
-          echo "Changes: backend=$BACKEND frontend=$FRONTEND (coverage SKIPPED) tests=$TESTS ci=$CI"
+          echo "frontend=$([[ $FRONTEND -gt 0 ]] && echo true || echo false)" >> $GITHUB_OUTPUT
+          echo "Changes: backend=$BACKEND frontend=$FRONTEND tests=$TESTS ci=$CI"
 
       - name: Backend tests + coverage
         if: steps.changes.outputs.backend == 'true'
@@ -147,7 +162,7 @@ jobs:
           git diff --cached --quiet || (git commit -m "ci: update test badges [skip ci]" && git push) || echo "Badge push failed"
 
   deploy:
-    needs: test
+    needs: [go-build, test]
     runs-on: self-hosted
     steps:
       - uses: actions/checkout@v4

.gitignore

@@ -20,3 +20,10 @@ public-instrumented/
 .squad/sessions/
 # Squad: SubSquad activation file (local to this machine)
 .squad-workstream
+# Temp scripts / build artifacts
+recover-delta.sh
+merge.sh
+replacements.txt
+reps.txt
+cmd/server/server.exe
+cmd/ingestor/ingestor.exe