fix: use pytest exit code for test detection instead of grep

pytest --collect-only exits 0 when tests exist, 5 when none found.
Previous grep-based check matched "test" in "no tests ran" summary.
Also revert validate.yml to inline version (reusable workflow needs investigation).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: baijum

.github/workflows/deploy.yml

@@ -19,7 +19,7 @@ jobs:
         run: |
           pip install -r requirements.txt
           pip install pytest
-          if python -m pytest --collect-only -q 2>/dev/null | grep -q "test"; then
+          if python -m pytest --collect-only -q >/dev/null 2>&1; then
             pytest --tb=short
           else
             echo "No tests found, skipping"

.github/workflows/validate.yml

@@ -6,4 +6,20 @@ on:
 
 jobs:
   validate:
-    uses: towlion/.github/.github/workflows/validate.yml@main
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - uses: actions/checkout@v4
+        with:
+          repository: towlion/platform
+          path: _platform
+        continue-on-error: true
+
+      - name: Run spec validator
+        if: success()
+        run: python _platform/validator/validate.py --tier 2 --dir .