## Metrics Standardization & Quality Fixes

This PR updates the metrics scripts to resolve lint errors and improve architectural consistency after the conversion to CSV format.

### 🛠 Fixes

1. **Lint Errors**: Resolved 6 `@typescript-eslint/no-unused-vars` errors by removing the unused `MetricOutput` import across the metric suite.
2. **License Standardization**: Removed redundant `@license` tags from all 8 metric scripts to match repository standards.
3. **GraphQL Consistency**: Updated `open_issues.ts` and `open_prs.ts` to use GraphQL variables (`-F`) and the `gh api graphql` pattern used by other scripts, improving security and readability.
4. **Output Consistency**: Migrated `open_issues.ts` and `open_prs.ts` from `console.log` to `process.stdout.write` for unified output behavior.
5. **Robust Execution**: Added `stdio: ['ignore', 'pipe', 'ignore']` to all `execSync` calls to ensure clean output streams and prevent unintentional inheritance of the parent process's stdio.
6. **Code Cleanup**: Removed the now-unused `MetricOutput` interface from `types.ts` and simplified `metrics/index.ts` by removing legacy JSON parsing logic.

### 🧪 Verification
- `npm run lint` now passes for all files in `tools/gemini-cli-bot/metrics/`.
- Validated all 8 scripts manually to ensure they still produce the correct CSV output.

tools/gemini-cli-bot/metrics/index.ts

@@ -42,43 +42,16 @@ function processOutputLine(line: string, results: string[]) {
   const trimmedLine = line.trim();
   if (!trimmedLine) return;
 
-  let metricName = '';
-  let metricValue = 0;
-
-  try {
-    const parsed = JSON.parse(trimmedLine);
-    if (
-      parsed &&
-      typeof parsed === 'object' &&
-      'metric' in parsed &&
-      'value' in parsed
-    ) {
-      metricName = parsed.metric;
-      metricValue = parseFloat(parsed.value);
-      results.push(`${metricName},${metricValue}`);
-    } else {
-      const parts = trimmedLine.split(',');
-      if (parts.length === 2) {
-        metricName = parts[0];
-        metricValue = parseFloat(parts[1]);
-        results.push(trimmedLine);
-      } else {
-        results.push(trimmedLine);
-        return; // Unable to parse for deltas
-      }
-    }
-  } catch {
-    const parts = trimmedLine.split(',');
-    if (parts.length === 2) {
-      metricName = parts[0];
-      metricValue = parseFloat(parts[1]);
-      results.push(trimmedLine);
-    } else {
-      results.push(trimmedLine);
-      return; // Unable to parse for deltas
-    }
+  const parts = trimmedLine.split(',');
+  if (parts.length !== 2) {
+    results.push(trimmedLine);
+    return;
   }
 
+  const metricName = parts[0];
+  const metricValue = parseFloat(parts[1]);
+  results.push(trimmedLine);
+
   // Calculate and append deltas if the metric is a valid number
   if (metricName && !isNaN(metricValue)) {
     const avg7d = getHistoricalAverage(metricName, 7);