feat(generator): add determineArtifactStatus for complete status determination

Add a helper function to determine artifact status based on business
logic conditions:
- blocked: blockedReason exists (validation failed, wrong page context)
- error: fatalError exists (API call failed)
- partial: reasons array non-empty (some data issues)
- empty: no rows returned
- ok: rows exist with no issues

This is Task 3 of 8 in the progressive template enhancement.

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src/generated_scene/generator.rs

@@ -325,6 +325,14 @@ function normalizeRows(rawData) {{
   }});
 }}
 
+function determineArtifactStatus({{ blockedReason = '', fatalError = '', reasons = [], rows = [] }}) {{
+  if (blockedReason) return 'blocked';
+  if (fatalError) return 'error';
+  if (reasons.length > 0) return 'partial';
+  if (!rows.length) return 'empty';
+  return 'ok';
+}}
+
 function buildArtifact(args, rows) {{
   return {{
     type: 'report-artifact',