diff --git a/docs/security/supply-chain.md b/docs/security/supply-chain.md
new file mode 100644
index 0000000..f8eba98
--- /dev/null
+++ b/docs/security/supply-chain.md
@@ -0,0 +1,18 @@
+# Build and supply-chain gate
+
+Merge and release controls:
+
+- frozen `pnpm-lock.yaml` installation; drift is blocking
+- clean production build with hashed assets and build manifest
+- machine-readable bundle sizes and checksums
+- source plus built-asset credential-pattern scan
+- direct dependency inventory and lockfile digest
+- base/head dependency diff review record
+
+Organization-specific vulnerability severity, denied-license list, SBOM format,
+and scanner selection remain policy inputs. An approved suppression must record
+reason, owner, expiry, affected package, and compensating control. Expired
+suppressions are blocking.
+
+`artifacts/security/dependency-diff.json` is a local baseline. CI replaces it
+with the actual base/head direct and transitive lockfile diff before release.
diff --git a/package.json b/package.json
index cb373b9..2f56afb 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build && node scripts/generate-build-manifest.mjs",
+    "build:release": "corepack pnpm build && corepack pnpm generate:supply-chain && corepack pnpm scan:security",
     "preview": "vite preview",
     "lint": "eslint src scripts tests vite.config.js vitest.config.js playwright.config.js --max-warnings=0",
     "check:architecture": "node scripts/check-architecture.mjs",
@@ -24,7 +25,10 @@
     "test:a11y": "playwright test --grep @a11y && node scripts/write-a11y-report.mjs",
     "review:a11y-manual": "node scripts/verify-a11y-manual.mjs",
     "test:sample-removal": "node scripts/test-sample-removal.mjs",
-    "test:all": "pnpm test:runtime-schema && pnpm test:unit && pnpm test:component && pnpm test:integration"
+    "test:all": "corepack pnpm test:runtime-schema && corepack pnpm test:unit && corepack pnpm test:component && corepack pnpm test:integration",
+    "verify:lockfile": "corepack pnpm install --frozen-lockfile",
+    "generate:supply-chain": "node scripts/generate-supply-chain.mjs",
+    "scan:security": "node scripts/security-scan.mjs"
   },
   "dependencies": {
     "@tanstack/react-query": "5.101.4",
diff --git a/schemas/artifacts/build-manifest.schema.json b/schemas/artifacts/build-manifest.schema.json
new file mode 100644
index 0000000..7bb681e
--- /dev/null
+++ b/schemas/artifacts/build-manifest.schema.json
@@ -0,0 +1,39 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "build-manifest.schema.json",
+  "type": "object",
+  "required": [
+    "schemaVersion",
+    "buildId",
+    "commitSha",
+    "generatedAt",
+    "buildContext",
+    "outputs"
+  ],
+  "properties": {
+    "schemaVersion": { "const": 1 },
+    "buildId": { "type": "string", "minLength": 1 },
+    "commitSha": { "type": "string", "minLength": 1 },
+    "generatedAt": { "type": "string", "format": "date-time" },
+    "buildContext": {
+      "type": "object",
+      "required": ["nodeVersion", "packageManagerVersion", "runnerImage"],
+      "properties": {
+        "nodeVersion": { "type": "string" },
+        "packageManagerVersion": { "type": "string" },
+        "runnerImage": { "type": "string" }
+      },
+      "additionalProperties": false
+    },
+    "outputs": {
+      "type": "object",
+      "required": ["directory", "viteManifest"],
+      "properties": {
+        "directory": { "type": "string" },
+        "viteManifest": { "type": "string" }
+      },
+      "additionalProperties": false
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/scripts/generate-supply-chain.mjs b/scripts/generate-supply-chain.mjs
new file mode 100644
index 0000000..d5f978e
--- /dev/null
+++ b/scripts/generate-supply-chain.mjs
@@ -0,0 +1,102 @@
+import { createHash } from "node:crypto";
+import { gzipSync } from "node:zlib";
+import {
+  mkdir,
+  readFile,
+  readdir,
+  stat,
+  writeFile,
+} from "node:fs/promises";
+import path from "node:path";
+
+/** @param {string} directory @returns {Promise<string[]>} */
+async function filesWithin(directory) {
+  const entries = await readdir(directory, { withFileTypes: true });
+  const nested = /** @type {string[][]} */ (await Promise.all(
+    entries.map((entry) => {
+      const target = path.join(directory, entry.name);
+      return entry.isDirectory() ? filesWithin(target) : [target];
+    }),
+  ));
+  return nested.flat().sort();
+}
+
+const packageJson = JSON.parse(await readFile("package.json", "utf8"));
+const lockfile = await readFile("pnpm-lock.yaml");
+const outputFiles = await filesWithin("dist");
+
+const outputs = await Promise.all(
+  outputFiles.map(async (outputFile) => {
+    const content = await readFile(outputFile);
+    const metadata = await stat(outputFile);
+    return {
+      path: outputFile,
+      bytes: metadata.size,
+      gzipBytes: gzipSync(content).byteLength,
+      sha256: createHash("sha256").update(content).digest("hex"),
+    };
+  }),
+);
+
+const dependencies = {
+  ...packageJson.dependencies,
+  ...packageJson.devDependencies,
+};
+const inventory = Object.entries(dependencies)
+  .sort(([left], [right]) => left.localeCompare(right))
+  .map(([name, version]) => ({ name, version, direct: true }));
+
+await mkdir("artifacts/performance", { recursive: true });
+await mkdir("artifacts/release", { recursive: true });
+await mkdir("artifacts/security", { recursive: true });
+
+await writeFile(
+  "artifacts/performance/bundle.json",
+  `${JSON.stringify(
+    {
+      schemaVersion: 1,
+      generatedAt: new Date().toISOString(),
+      context: {
+        nodeVersion: process.version,
+        packageManager: packageJson.packageManager,
+        runnerImage: process.env.CI_RUNNER_IMAGE ?? `${process.platform}-${process.arch}`,
+      },
+      outputs,
+    },
+    null,
+    2,
+  )}\n`,
+);
+
+await writeFile(
+  "artifacts/release/dependency-inventory.json",
+  `${JSON.stringify(
+    {
+      schemaVersion: 1,
+      lockfileSha256: createHash("sha256").update(lockfile).digest("hex"),
+      dependencies: inventory,
+    },
+    null,
+    2,
+  )}\n`,
+);
+
+await writeFile(
+  "artifacts/release/checksums.txt",
+  `${outputs.map((output) => `${output.sha256}  ${output.path}`).join("\n")}\n`,
+);
+
+await writeFile(
+  "artifacts/security/dependency-diff.json",
+  `${JSON.stringify(
+    {
+      schemaVersion: 1,
+      reviewStatus: "local-baseline",
+      directDependencies: inventory.length,
+      highRiskUnreviewed: [],
+      lockfileSha256: createHash("sha256").update(lockfile).digest("hex"),
+    },
+    null,
+    2,
+  )}\n`,
+);
diff --git a/scripts/security-scan.mjs b/scripts/security-scan.mjs
new file mode 100644
index 0000000..684ee77
--- /dev/null
+++ b/scripts/security-scan.mjs
@@ -0,0 +1,82 @@
+import { mkdir, readFile, readdir, writeFile } from "node:fs/promises";
+import path from "node:path";
+
+const scanRoots = ["src", "dist"];
+const findings = /** @type {Array<{ruleId: string, file: string}>} */ ([]);
+const patterns = [
+  { id: "private-key", expression: /-----BEGIN (?:RSA |EC )?PRIVATE KEY-----/g },
+  { id: "aws-access-key", expression: /\bAKIA[0-9A-Z]{16}\b/g },
+  { id: "github-token", expression: /\bgh[pousr]_[A-Za-z0-9_]{30,}\b/g },
+  {
+    id: "assigned-secret",
+    expression:
+      /\b(?:client_secret|password|private_key)\s*[:=]\s*["'][^"'${}]{12,}["']/gi,
+  },
+];
+
+/** @param {string} directory @returns {Promise<string[]>} */
+async function filesWithin(directory) {
+  const entries = await readdir(directory, { withFileTypes: true });
+  const nested = /** @type {string[][]} */ (await Promise.all(
+    entries.map((entry) => {
+      const target = path.join(directory, entry.name);
+      return entry.isDirectory() ? filesWithin(target) : [target];
+    }),
+  ));
+  return nested.flat();
+}
+
+for (const root of scanRoots) {
+  for (const scanFile of await filesWithin(root)) {
+    if (/\.(png|jpg|jpeg|gif|woff2?|zip)$/i.test(scanFile)) continue;
+    const content = await readFile(scanFile, "utf8");
+    for (const pattern of patterns) {
+      pattern.expression.lastIndex = 0;
+      if (pattern.expression.test(content)) {
+        findings.push({ ruleId: pattern.id, file: scanFile });
+      }
+    }
+  }
+}
+
+const sarif = {
+  version: "2.1.0",
+  $schema:
+    "https://json.schemastore.org/sarif-2.1.0.json",
+  runs: [
+    {
+      tool: {
+        driver: {
+          name: "ca-frontend-secret-scan",
+          rules: patterns.map((pattern) => ({
+            id: pattern.id,
+            shortDescription: { text: "Potential credential material" },
+          })),
+        },
+      },
+      results: findings.map((finding) => ({
+        ruleId: finding.ruleId,
+        message: { text: "Potential secret material must be removed." },
+        locations: [
+          {
+            physicalLocation: {
+              artifactLocation: { uri: finding.file },
+            },
+          },
+        ],
+      })),
+    },
+  ],
+};
+
+await mkdir("artifacts/security", { recursive: true });
+await writeFile(
+  "artifacts/security/scan.sarif",
+  `${JSON.stringify(sarif, null, 2)}\n`,
+);
+
+if (findings.length > 0) {
+  process.stderr.write(`Security scan found ${findings.length} blocking result(s).\n`);
+  process.exit(1);
+}
+process.stdout.write("Source and built-asset secret scan: PASS\n");