experiment(confidence-engine): add reconstruction-only helper flag

scripts/start-case-experiment-helper.cjs

@@ -8,6 +8,7 @@
  * Usage:
  *   node scripts/start-case-experiment-helper.cjs "<scenario text>"
  *   node scripts/start-case-experiment-helper.cjs --file scenario.json
+ *   node scripts/start-case-experiment-helper.cjs --reconstruction-only --file scenario.json
  *
  * Exit codes:
  *   0 — success (structured result printed to stdout)
@@ -86,7 +87,7 @@ async function runStartCaseExperiment(scenarioInput, experimentInstruction, opti
 
   if (!startCase && isMock) {
     // Deterministic mode: skip environment checks and use inline test double.
-    startCase = async (body) => {
+    startCase = async (_body, dependencies) => {
       // Deterministic inline test double — no live model calls.
       const shouldFail = process.env.START_CASE_EXPERIMENT_HELPER_FORCE_FAIL === "1";
       if (shouldFail) {
@@ -98,7 +99,12 @@ async function runStartCaseExperiment(scenarioInput, experimentInstruction, opti
         assessment: { phase: "initial", progress: 0 },
         selectedQuestion: null,
         summary: null,
-        diagnostics: { validationStatus: "mock", modelName: "inline-test-double", graphReferenceValidation: { valid: true, errors: [] } },
+        diagnostics: {
+          validationStatus: "mock",
+          modelName: "inline-test-double",
+          reconstructionOnly: dependencies.reconstructionOnly === true,
+          graphReferenceValidation: { valid: true, errors: [] },
+        },
       };
     };
   } else if (!startCase) {
@@ -197,7 +203,10 @@ if (require.main === module) {
     }
 
     const scenarioInput = readScenarioInput(process.argv);
-    const result = await runStartCaseExperiment(scenarioInput, experimentInstruction);
+    const reconstructionOnly = process.argv.includes("--reconstruction-only");
+    const result = await runStartCaseExperiment(scenarioInput, experimentInstruction, {
+      reconstructionOnly,
+    });
 
     console.log(JSON.stringify(result, null, 2));
     process.exit(result.success ? 0 : 1);

tests/scripts/start-case-experiment-helper.test.js

@@ -141,6 +141,24 @@ describe("start-case-experiment-helper.cjs apparatus", () => {
     });
   });
 
+  describe("B.1 — reconstruction-only CLI option", () => {
+    it("passes reconstructionOnly through the startCase seam without selecting OpenAI", async () => {
+      const result = await runHelper(["--reconstruction-only", "Scenario text"]);
+      expect(result.exitCode).toBe(0);
+      const parsed = parseOutput(result);
+      expect(parsed.diagnostics).toMatchObject({
+        modelName: "inline-test-double",
+        reconstructionOnly: true,
+      });
+    });
+
+    it("composes reconstruction-only with file input", async () => {
+      const result = await runHelper(["--reconstruction-only", "--file", tmpFile]);
+      expect(result.exitCode).toBe(0);
+      expect(parseOutput(result).diagnostics.reconstructionOnly).toBe(true);
+    });
+  });
+
   // ── C — Environment loading ─────────────────────────────────────
 
   describe("C — environment loading", () => {