feat: complete evidence restructuring worktree

harness/.pi/extensions/gate/__tests__/gate_workflow_observable_contract.test.js

@@ -1,6 +1,5 @@
 const test = require("node:test");
 const assert = require("node:assert");
-const crypto = require("node:crypto");
 const cp = require("node:child_process");
 const fs = require("node:fs");
 const { createRequire } = require("node:module");
@@ -125,17 +124,26 @@ function stripDescriptions(value, insideProperties = false) {
   return value;
 }
 
-test("the injected skill stays byte-identical during extraction", () => {
+test("before_agent_start injects the canonical skill byte-for-byte", async () => {
   const harnessRoot = path.resolve(__dirname, "..", "..", "..", "..");
-  const digest = (relativePath) => crypto
-    .createHash("sha256")
-    .update(fs.readFileSync(path.join(harnessRoot, relativePath)))
-    .digest("hex");
-
-  assert.equal(
-    digest(path.join(".pi", "skills", "tht-sessione", "SKILL.md")),
-    "626a794071c095a4f20fffabb3bab901f05c101590adbdc58e45adfae56f3219",
+  const canonicalSkill = fs.readFileSync(
+    path.join(harnessRoot, ".pi", "skills", "tht-sessione", "SKILL.md"),
+    "utf8",
   );
+  const { pi } = createFakePi();
+  installGate(pi);
+
+  await pi.emit("input", { source: "rpc", text: '/nuova-domanda "x"' });
+  const injected = await pi.emit("before_agent_start", { systemPrompt: "BASE" });
+  const systemPrompt = injected?.systemPrompt ?? "";
+  const opening = "<tht-sessione-skill>\n";
+  const closing = "\n</tht-sessione-skill>";
+  const start = systemPrompt.indexOf(opening);
+  const end = systemPrompt.indexOf(closing, start + opening.length);
+
+  assert.notEqual(start, -1);
+  assert.notEqual(end, -1);
+  assert.equal(systemPrompt.slice(start + opening.length, end), canonicalSkill);
 });
 
 test("F1 persists a concrete clarification directly from the select widget", async () => {