feat(confidence-engine): strengthen initial reconstruction contract

lib/reconstruction/prompt.js

@@ -7,14 +7,14 @@ const __dirname = dirname(__filename);
 const PROMPTS_DIR = join(__dirname, "../../prompts");
 
 /** Available prompt versions */
-export const PROMPT_VERSIONS = ["v0.1", "v0.2", "v0.3"];
+export const PROMPT_VERSIONS = ["v0.1", "v0.2", "v0.3", "v0.4"];
 
 /** Default prompt version (override via RECONSTRUCTION_PROMPT_VERSION env var) */
 const defaultVersionFromEnv = process.env.RECONSTRUCTION_PROMPT_VERSION;
 export const DEFAULT_PROMPT_VERSION =
   defaultVersionFromEnv && PROMPT_VERSIONS.includes(defaultVersionFromEnv)
     ? defaultVersionFromEnv
-    : "v0.3";
+    : "v0.4";
 
 /** Build a v0.1 (extraction-only) prompt inline for backward compatibility */
 function buildV1Prompt(scenario) {
@@ -77,15 +77,29 @@ async function buildV3Prompt(scenario) {
   }
 }
 
+/** Load a versioned prompt from disk and substitute {{SCENARIO}} */
+async function buildV4Prompt(scenario) {
+  try {
+    const content = await fs.readFile(
+      join(PROMPTS_DIR, "reconstruct-v0.4.md"),
+      "utf-8",
+    );
+    return content.replace("{{SCENARIO}}", scenario);
+  } catch {
+    // Fall back to v0.3 prompt if v0.4 file is missing
+    return buildV3Prompt(scenario);
+  }
+}
+
 /**
  * Build an analysis prompt for the given version.
  * @param {string} scenario - The scenario text
- * @param {"v0.1" | "v0.2" | "v0.3"} [version="v0.3"] - Prompt version
+ * @param {"v0.1" | "v0.2" | "v0.3" | "v0.4"} [version="v0.4"] - Prompt version
  * @param {object} [opts] - Optional experimental parameters
  * @param {string} [opts.experimentInstruction] - Bounded experimental instruction block appended to the base prompt (production prompt is never replaced)
  * @returns {Promise<{prompt: string, version: string}>}
  */
-export async function buildPrompt(scenario, version = "v0.3", opts = {}) {
+export async function buildPrompt(scenario, version = "v0.4", opts = {}) {
   let prompt;
   switch (version) {
     case "v0.1":
@@ -94,6 +108,9 @@ export async function buildPrompt(scenario, version = "v0.3", opts = {}) {
     case "v0.2":
       prompt = await buildV2Prompt(scenario);
       break;
+    case "v0.4":
+      prompt = await buildV4Prompt(scenario);
+      break;
     default: // v0.3
       prompt = await buildV3Prompt(scenario);
       break;