diff --git a/package.json b/package.json
index 5086c29..caf51b7 100644
--- a/package.json
+++ b/package.json
@@ -87,6 +87,8 @@
     "check:artifact-schemas": "node scripts/generate-artifact-schemas.ts --check",
     "generate:tech-log-contract": "node scripts/generate-tech-log-contract.ts",
     "check:tech-log-contract": "node scripts/generate-tech-log-contract.ts --check",
+    "generate:dev-release-manifest": "node scripts/check-dev-release-manifest.ts --write",
+    "check:dev-release-manifest": "node scripts/check-dev-release-manifest.ts",
     "generate:supply-chain": "node scripts/generate-supply-chain.ts",
     "verify:local-evidence": "node scripts/verify-release-candidate.ts && node scripts/verify-release.ts && node scripts/verify-supply-chain-artifacts.ts && node scripts/verify-archived-local-evidence.ts && node scripts/verify-release-candidate.ts",
     "verify:promotion": "node scripts/verify-exact-promotion-bundle.ts",
diff --git a/public/release-manifest.json b/public/release-manifest.json
index dc1933e..e10a2e4 100644
--- a/public/release-manifest.json
+++ b/public/release-manifest.json
@@ -38,7 +38,15 @@
   },
   "contractSet": {
     "setAlgorithm": "CA_CONTRACT_SET_V1",
-    "setDigest": "sha256:ad6aab71fea6a9ff87cbd170b984b339965afc90d85bb57f87801c9e0c020da2",
-    "packages": []
+    "setDigest": "sha256:e0da77655f51592ece583826d5fc6b092f57dd2bf63307e45e7e77283e6bf437",
+    "packages": [
+      {
+        "packageId": "@tech-log/studio-contract",
+        "version": "2.0.0",
+        "digest": "sha256:99f54f56ea0c582eafdbdf9be5653e3384bef0a1b08bff67f3147ee0292019ea",
+        "runtimeProtocolVersion": 1,
+        "sourceRevision": "ce2e748"
+      }
+    ]
   }
 }
diff --git a/scripts/check-dev-release-manifest.ts b/scripts/check-dev-release-manifest.ts
new file mode 100644
index 0000000..93d4650
--- /dev/null
+++ b/scripts/check-dev-release-manifest.ts
@@ -0,0 +1,42 @@
+/**
+ * Gate: the hand-maintained dev fixture `public/release-manifest.json` must
+ * declare the same `contractSet` the build compiles.
+ *
+ * `corepack pnpm dev` serves that file verbatim, and `verifyContractSet` runs
+ * unconditionally at boot, so a stale fixture is a hard boot failure of
+ * `pnpm dev` in the default `MOCK` mode — not an `HTTP`-mode caveat. Nothing
+ * else in the gate set reads `public/*.json`, which is how a completely broken
+ * `pnpm dev` shipped with every static check green.
+ *
+ * `--write` refreshes the block instead of failing; that is what
+ * `corepack pnpm generate:tech-log-contract` calls.
+ */
+import process from "node:process";
+
+import {
+  DEV_RELEASE_MANIFEST_PATH,
+  checkDevReleaseManifestContractSet,
+  refreshDevReleaseManifestContractSet,
+} from "./lib/dev-release-manifest.ts";
+
+const write = process.argv.includes("--write");
+
+if (write) {
+  const { changed, contractSet } = await refreshDevReleaseManifestContractSet();
+  process.stdout.write(
+    `${changed ? "Updated" : "Already in sync"}: ${DEV_RELEASE_MANIFEST_PATH} contractSet ` +
+      `(${contractSet.packages.length} package(s), ${contractSet.setDigest})\n`,
+  );
+} else {
+  const failures = await checkDevReleaseManifestContractSet();
+  if (failures.length > 0) {
+    process.stderr.write(
+      `dev release manifest drift:\n- ${failures.join("\n- ")}\n` +
+        `Run: corepack pnpm generate:dev-release-manifest\n`,
+    );
+    process.exit(1);
+  }
+  process.stdout.write(
+    `${DEV_RELEASE_MANIFEST_PATH} contractSet matches the compiled contract set.\n`,
+  );
+}
diff --git a/scripts/generate-tech-log-contract.ts b/scripts/generate-tech-log-contract.ts
index e67ff29..b75d2d4 100644
--- a/scripts/generate-tech-log-contract.ts
+++ b/scripts/generate-tech-log-contract.ts
@@ -121,3 +121,21 @@ writeFileSync(SOURCE_RECORD, `${JSON.stringify(record, null, 2)}\n`);
 console.log(
   `Generated from ${record.packageId}@${record.version} (${record.sourceRevision}), ${record.operationIds.length} operations.`,
 );
+
+// 재생성은 매번 package digest를 바꾼다. `pnpm dev`가 그대로 서빙하는
+// `public/release-manifest.json`은 build가 컴파일한 contract set을 그대로
+// 선언해야 하고(§5.5, `verifyContractSet`는 MOCK 모드에서도 무조건 돈다),
+// 그러지 않으면 dev 부팅이 CONTRACT_SET_PACKAGE_MISSING으로 닫힌다.
+// 방금 쓴 canonical-source.json을 읽어야 하므로 정적 import가 아닌 동적
+// import로 불러온다.
+const { refreshDevReleaseManifestContractSet, DEV_RELEASE_MANIFEST_PATH } =
+  await import("./lib/dev-release-manifest.ts");
+const refreshed = await refreshDevReleaseManifestContractSet();
+console.log(
+  `${refreshed.changed ? "Updated" : "Already in sync"}: ${DEV_RELEASE_MANIFEST_PATH} contractSet ` +
+    `(${refreshed.contractSet.packages.length} package(s), ${refreshed.contractSet.setDigest})`,
+);
+
+// contract를 다시 만들지 않아도 구성된 set은 바뀔 수 있다
+// (`installed-contract-contributions.ts`에 기여가 추가/제거되는 경우).
+// 그 경로는 여기서 못 잡으므로 `check:dev-release-manifest` 게이트가 잡는다.
diff --git a/scripts/lib/dev-release-manifest.ts b/scripts/lib/dev-release-manifest.ts
new file mode 100644
index 0000000..518e834
--- /dev/null
+++ b/scripts/lib/dev-release-manifest.ts
@@ -0,0 +1,135 @@
+import { readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
+
+import { buildContractSet } from "../generate-contract-set.ts";
+import { contractSetSchema, type ContractSet } from "../../src/contracts/contract-set.ts";
+
+/**
+ * `corepack pnpm dev` never runs the build pipeline: plain `vite` serves
+ * `public/release-manifest.json` verbatim. That fixture therefore has to carry
+ * the same `contractSet` block `scripts/generate-build-manifest.ts` writes into
+ * `dist/release-manifest.json`, because `verifyContractSet` runs unconditionally
+ * at boot — in the default `MOCK` mode as much as in `HTTP` mode. When the two
+ * disagree the app renders the fail-closed boot screen instead of the shell.
+ *
+ * Both halves of the answer live here so they cannot disagree: the generation
+ * step rewrites the block, and the CI gate compares it.
+ */
+
+export const DEV_RELEASE_MANIFEST_PATH = "public/release-manifest.json";
+
+export type DevReleaseManifestContractSet = ContractSet;
+
+function resolveManifestPath(root: string): string {
+  return path.join(root, DEV_RELEASE_MANIFEST_PATH);
+}
+
+/**
+ * The contract set the build would compile, derived from
+ * `EXPECTED_CONTRACT_SET_PACKAGES` exactly as `generate-build-manifest.ts`
+ * derives it.
+ */
+export function expectedDevReleaseManifestContractSet(): DevReleaseManifestContractSet {
+  return contractSetSchema.parse(
+    JSON.parse(JSON.stringify(buildContractSet())),
+  );
+}
+
+/**
+ * Compares one manifest `contractSet` block against the compiled expectation.
+ * Returns one human-readable line per disagreement; an empty array means the
+ * fixture would boot.
+ */
+export function compareDevReleaseManifestContractSet(
+  actual: unknown,
+  expected: DevReleaseManifestContractSet,
+): string[] {
+  const parsed = contractSetSchema.safeParse(actual);
+  if (!parsed.success) {
+    return [
+      `${DEV_RELEASE_MANIFEST_PATH} contractSet is missing or not a valid contract set: ${parsed.error.issues
+        .map((issue) => `${issue.path.join(".") || "root"}: ${issue.message}`)
+        .join("; ")}`,
+    ];
+  }
+  const manifest = parsed.data;
+  const failures: string[] = [];
+  if (manifest.setAlgorithm !== expected.setAlgorithm) {
+    failures.push(
+      `setAlgorithm drift: manifest ${manifest.setAlgorithm}, build ${expected.setAlgorithm}`,
+    );
+  }
+  if (manifest.setDigest !== expected.setDigest) {
+    failures.push(
+      `setDigest drift: manifest ${manifest.setDigest}, build ${expected.setDigest}`,
+    );
+  }
+  const manifestById = new Map(
+    manifest.packages.map((entry) => [entry.packageId, entry] as const),
+  );
+  const expectedById = new Map(
+    expected.packages.map((entry) => [entry.packageId, entry] as const),
+  );
+  for (const [packageId, entry] of expectedById) {
+    const declared = manifestById.get(packageId);
+    if (!declared) {
+      failures.push(
+        `package missing from the manifest (boot fails with CONTRACT_SET_PACKAGE_MISSING): ${packageId}@${entry.version}`,
+      );
+      continue;
+    }
+    if (JSON.stringify(declared) !== JSON.stringify(entry)) {
+      failures.push(
+        `package drift for ${packageId}: manifest ${JSON.stringify(declared)}, build ${JSON.stringify(entry)}`,
+      );
+    }
+  }
+  for (const packageId of manifestById.keys()) {
+    if (!expectedById.has(packageId)) {
+      failures.push(
+        `package declared by the manifest but not compiled into the build (boot fails with CONTRACT_SET_PACKAGE_UNEXPECTED): ${packageId}`,
+      );
+    }
+  }
+  return failures;
+}
+
+export async function readDevReleaseManifest(
+  root: string = process.cwd(),
+): Promise<Record<string, unknown>> {
+  const raw = await readFile(resolveManifestPath(root), "utf8");
+  const document: unknown = JSON.parse(raw);
+  if (!document || typeof document !== "object" || Array.isArray(document)) {
+    throw new TypeError(`${DEV_RELEASE_MANIFEST_PATH} must be a JSON object`);
+  }
+  return document as Record<string, unknown>;
+}
+
+export async function checkDevReleaseManifestContractSet(
+  root: string = process.cwd(),
+): Promise<readonly string[]> {
+  const document = await readDevReleaseManifest(root);
+  return compareDevReleaseManifestContractSet(
+    document["contractSet"],
+    expectedDevReleaseManifestContractSet(),
+  );
+}
+
+/**
+ * Rewrites only the `contractSet` block. Every other field of the hand
+ * maintained fixture is preserved byte for byte by round-tripping the same
+ * two-space JSON encoding the file already uses.
+ */
+export async function refreshDevReleaseManifestContractSet(
+  root: string = process.cwd(),
+): Promise<Readonly<{ changed: boolean; contractSet: DevReleaseManifestContractSet }>> {
+  const target = resolveManifestPath(root);
+  const document = await readDevReleaseManifest(root);
+  const contractSet = expectedDevReleaseManifestContractSet();
+  const previous = JSON.stringify(document["contractSet"]);
+  document["contractSet"] = contractSet;
+  const next = `${JSON.stringify(document, null, 2)}\n`;
+  const changed = previous !== JSON.stringify(contractSet);
+  if (changed) await writeFile(target, next, "utf8");
+  return Object.freeze({ changed, contractSet });
+}