chore: establish clean v0.2 baseline

Include only the working reconstruction prototype with Ollama integration:
- double-wrapping fix (lib/llm/provider.js)
- explicit v0.2 JSON output schema (prompts/reconstruct-v0.2.md)
- Zod validation layer (lib/reconstruction/schema.js)
- shared core analysis path (lib/analysis.js)
- prompt versioning infrastructure (lib/reconstruction/prompt.js)
- provider abstraction
- functioning Ollama provider path
- updated API route with centralized analysis
- UI components displaying v0.2 data and validation errors
- .gitignore rules for generated evaluation artifacts

Exclude: evaluator experiments, diagnostic tests, debug scripts,
generated artifacts, comparison findings, test data tied to evaluator.

components/scenario-form.jsx

@@ -8,7 +8,7 @@ const MAX_LENGTH = 10000;
 
 export default function ScenarioForm() {
   const [scenario, setScenario] = useState("");
-  const [status, setStatus] = useState("idle"); // idle | loading | error | success
+  const [status, setStatus] = useState("idle"); // idle | loading | error | success | partial
   const [result, setResult] = useState(null);
   const textareaRef = useRef(null);
 
@@ -29,6 +29,10 @@ export default function ScenarioForm() {
       if (res.ok && data.validationStatus === "valid") {
         setStatus("success");
         setResult(data);
+      } else if (data.success) {
+        // Success in analysis but validation may be partial
+        setStatus("success");
+        setResult(data);
       } else {
         setStatus("error");
         setResult(data);
@@ -39,8 +43,13 @@ export default function ScenarioForm() {
     }
   };
 
-  // Always show diagnostics when there's a result (even if validation failed)
-  const hasDiagnostics = result && (result.reconstruction || result.modelName || result.responseDurationMs !== undefined);
+  // Determine if we have meaningful content to display
+  const hasClassification = result?.inputClassification;
+  const hasReconstruction = result?.reconstruction;
+  const hasNextQuestion = result?.nextQuestion;
+  const hasEvidence = result?.evidence && result.evidence.length > 0;
+  const hasMeaningfulContent =
+    hasClassification || hasReconstruction || hasNextQuestion || hasEvidence;
 
   return (
     <div className="space-y-6">
@@ -54,7 +63,9 @@ export default function ScenarioForm() {
           className="w-full rounded-lg border border-gray-300 px-4 py-3 text-sm focus:border-gray-500 focus:outline-none focus:ring-2 focus:ring-gray-400"
         />
         <div className="flex items-center justify-between">
-          <span className="text-xs text-gray-400">{scenario.length}/{MAX_LENGTH}</span>
+          <span className="text-xs text-gray-400">
+            {scenario.length}/{MAX_LENGTH}
+          </span>
           <button
             type="submit"
             disabled={status === "loading" || !scenario.trim()}
@@ -65,6 +76,7 @@ export default function ScenarioForm() {
         </div>
       </form>
 
+      {/* Error state */}
       {status === "error" && (
         <div className="space-y-3">
           {result?.error && (
@@ -72,35 +84,51 @@ export default function ScenarioForm() {
               Error: {result.error}
             </div>
           )}
-          {hasDiagnostics && result?.modelName && (
-            <dl className="grid grid-cols-[auto_1fr] gap-x-4 gap-y-1.5 text-sm">
-              <dt className="text-gray-500">Model</dt>
-              <dd>{result.modelName}</dd>
-              <dt className="text-gray-500">Duration</dt>
-              <dd>{result.responseDurationMs != null ? `${result.responseDurationMs}ms` : "?"}</dd>
-            </dl>
+          {/* Show partial content even on validation failure */}
+          {(hasClassification || hasReconstruction) && (
+            <div className="rounded-lg border border-yellow-300 bg-yellow-50 px-4 py-2 text-sm text-yellow-800">
+              ⚠ Partial result — some fields failed validation. Showing what was
+              accepted.
+            </div>
+          )}
+          {hasReconstruction && (
+            <ReconstructionView reconstruction={result} partial />
           )}
         </div>
       )}
 
-      {status === "success" && result?.reconstruction && (
+      {/* Success state */}
+      {status === "success" && hasMeaningfulContent && (
         <div className="space-y-4">
-          <ReconstructionView reconstruction={result.reconstruction} />
-          <DiagnosticsView result={result} />
+          <ReconstructionView reconstruction={result} />
         </div>
       )}
 
-      {status === "error" && result?.reconstruction && (
-        <div className="space-y-3">
-          <div className="rounded-lg border border-yellow-300 bg-yellow-50 px-4 py-2 text-sm text-yellow-800">
-            ⚠ Partial result — some fields failed validation. Showing what was accepted.
-          </div>
-          <ReconstructionView reconstruction={result.reconstruction} partial />
-        </div>
+      {/* Always show diagnostics when we have any result */}
+      {(hasClassification || hasReconstruction || hasNextQuestion) && (
+        <DiagnosticsView result={result} />
       )}
 
       {status === "loading" && (
-        <div className="py-12 text-center text-sm text-gray-400">Waiting for model response...</div>
+        <div className="py-12 text-center text-sm text-gray-400">
+          Waiting for model response...
+        </div>
+      )}
+
+      {/* Empty state */}
+      {status === "idle" && (
+        <div className="rounded-lg border border-dashed border-gray-300 bg-gray-50 px-6 py-8 text-center">
+          <p className="text-sm text-gray-400">
+            Enter a scenario above and click Analyse to begin.
+          </p>
+        </div>
+      )}
+
+      {/* Invalid result with no partial data */}
+      {status === "error" && !result?.error && !hasMeaningfulContent && (
+        <div className="rounded-lg border border-yellow-300 bg-yellow-50 px-4 py-2 text-sm text-yellow-800">
+          Validation failed — no structured output was produced.
+        </div>
       )}
     </div>
   );