Fix cost-tracker SELECT against canonical schema (v0.15.1)

The cost-preview probe in get_avg_tokens_for_stages() referenced
input_tokens/output_tokens/timestamp, which don't exist. Canonical
columns are prompt_tokens/completion_tokens/created_at. Empty-result
fallback was masking the failure functionally, but the wpdb debug
notice was visibly leaking to every admin visit of the AI Models tab.

Adds regression tests that assert $wpdb->last_error after the call,
so the next schema drift won't be masked the same way.

Bug present since v0.11.0 (2026-04-23).

Agent-Session: engineer-prautoblogger cost-tracker-schema-mismatch

.github/workflows/cto-review.yml

@@ -123,18 +123,17 @@ jobs:
           git fetch origin ${{ github.event.pull_request.base.ref }} --depth=50
           BASE_SHA="${{ github.event.pull_request.base.sha }}"
           HEAD_SHA="${{ github.event.pull_request.head.sha }}"
-          # Write the diff to a file, not a step output / env var. Passing a
+          DIFF=$(git diff --no-color "$BASE_SHA" "$HEAD_SHA" | head -c 400000)
-          # ~400KB diff through the process env (execve argv+envp) exceeds the
-          # runner ARG_MAX and fails the next step with "Argument list too long"
-          # (issue #110). File transport also sidesteps the ~1MB step-output cap.
-          git diff --no-color "$BASE_SHA" "$HEAD_SHA" | head -c 400000 > /tmp/cto-review-diff.txt
           FILES=$(git diff --name-only "$BASE_SHA" "$HEAD_SHA")
-          SIZE=$(wc -c < /tmp/cto-review-diff.txt)
+          SIZE=$(echo -n "$DIFF" | wc -c)
           {
             echo "size=$SIZE"
             echo "files<<EOF_FILES"
             echo "$FILES"
             echo "EOF_FILES"
+            echo "diff<<EOF_DIFF"
+            echo "$DIFF"
+            echo "EOF_DIFF"
           } >> "$GITHUB_OUTPUT"
 
       - name: Load repo conventions
@@ -162,7 +161,7 @@ jobs:
           PR_AUTHOR: ${{ github.event.pull_request.user.login }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
           REPO_NAME: ${{ github.event.repository.name }}
-          DIFF_PATH: /tmp/cto-review-diff.txt
+          DIFF: ${{ steps.diff.outputs.diff }}
           DIFF_SIZE: ${{ steps.diff.outputs.size }}
           CHANGED_FILES: ${{ steps.diff.outputs.files }}
           CONVENTIONS: ${{ steps.conventions.outputs.content }}
@@ -230,9 +229,7 @@ jobs:
           user_blocks.append(f"**Changed files:**\n```\n{os.environ['CHANGED_FILES']}\n```\n")
           if os.environ.get("CONVENTIONS", "").strip():
               user_blocks.append(f"# Repo CONVENTIONS.md\n{os.environ['CONVENTIONS']}\n")
-          with open(os.environ["DIFF_PATH"], encoding="utf-8", errors="replace") as _df:
+          user_blocks.append(f"# Diff\n```diff\n{os.environ['DIFF']}\n```\n")
-              _diff_text = _df.read()
-          user_blocks.append(f"# Diff\n```diff\n{_diff_text}\n```\n")
           user_message = "\n\n".join(user_blocks)
 
           tools = [{

.github/workflows/deploy.yml

@@ -71,7 +71,7 @@ jobs:
 
   deploy-production:
     name: Deploy to Production
-    needs: [validate, deploy-staging]
+    needs: [validate, deploy-staging, smoke]
     runs-on: ubuntu-latest
     environment: production
     steps: