feat: govern frontend contract compatibility

config/compatibility/fixtures.json

@@ -0,0 +1,63 @@
+{
+  "schemaVersion": 1,
+  "families": {
+    "api": {
+      "additive": {
+        "before": { "required": ["id"], "properties": { "id": {} } },
+        "after": {
+          "required": ["id"],
+          "properties": { "id": {}, "displayName": {} }
+        }
+      },
+      "breaking": {
+        "before": { "required": ["id"], "properties": { "id": {} } },
+        "after": {
+          "required": ["id", "name"],
+          "properties": { "id": {}, "name": {} }
+        }
+      }
+    },
+    "config": {
+      "additive": {
+        "before": { "required": ["APP_ENV"], "properties": { "APP_ENV": {} } },
+        "after": {
+          "required": ["APP_ENV"],
+          "properties": { "APP_ENV": {}, "OPTIONAL_FLAG": {} }
+        }
+      },
+      "breaking": {
+        "before": { "required": ["APP_ENV"], "properties": { "APP_ENV": {} } },
+        "after": {
+          "required": ["APP_ENV", "NEW_REQUIRED"],
+          "properties": { "APP_ENV": {}, "NEW_REQUIRED": {} }
+        }
+      }
+    },
+    "storage": {
+      "additive": {
+        "before": { "properties": { "theme": {} } },
+        "after": { "properties": { "theme": {}, "contrast": {} } }
+      },
+      "breaking": {
+        "before": { "properties": { "theme": {} } },
+        "after": { "properties": {} }
+      }
+    },
+    "release": {
+      "additive": {
+        "before": { "required": ["buildId"], "properties": { "buildId": {} } },
+        "after": {
+          "required": ["buildId"],
+          "properties": { "buildId": {}, "builtAt": {} }
+        }
+      },
+      "breaking": {
+        "before": { "required": ["buildId"], "properties": { "buildId": {} } },
+        "after": {
+          "required": ["buildId", "assetManifestHash"],
+          "properties": { "buildId": {}, "assetManifestHash": {} }
+        }
+      }
+    }
+  }
+}

config/contracts/registry-governance.json

@@ -0,0 +1,158 @@
+{
+  "schemaVersion": 1,
+  "registries": [
+    {
+      "registryId": "FE-REG-ROUTE",
+      "path": "src/contracts/routes.js",
+      "exportName": "ROUTE_REGISTRY",
+      "owner": "feature-routing-navigation-guard-contract",
+      "requiredFields": [
+        "routeId",
+        "path",
+        "paramsSchema",
+        "searchSchema",
+        "access",
+        "loadingSurface",
+        "errorSurface",
+        "chunkId"
+      ]
+    },
+    {
+      "registryId": "FE-REG-API",
+      "path": "src/contracts/api-operations.js",
+      "exportName": "API_OPERATIONS",
+      "owner": "feature-api-client-response-envelope-contract",
+      "requiredFields": [
+        "method",
+        "path",
+        "operationId",
+        "auth",
+        "timeoutMs",
+        "idempotency",
+        "requestSchema",
+        "responseSchema",
+        "owner"
+      ]
+    },
+    {
+      "registryId": "FE-REG-ENV",
+      "path": "src/contracts/env.js",
+      "exportName": "ENV_REGISTRY",
+      "owner": "feature-frontend-env-runtime-config-contract",
+      "requiredFields": ["phase", "classification", "required", "defaultValue"]
+    },
+    {
+      "registryId": "FE-REG-STORAGE",
+      "path": "src/contracts/storage-keys.js",
+      "exportName": "STORAGE_REGISTRY",
+      "owner": "feature-frontend-storage-registry-contract",
+      "requiredFields": [
+        "logicalName",
+        "physicalKey",
+        "backend",
+        "classification",
+        "schemaVersion",
+        "ttl",
+        "migration",
+        "quotaFallback"
+      ]
+    },
+    {
+      "registryId": "FE-REG-ERROR",
+      "path": "src/contracts/errors.js",
+      "exportName": "ERROR_REGISTRY",
+      "owner": "feature-frontend-error-classification-boundary-contract",
+      "requiredFields": [
+        "kind",
+        "defaultRetryable",
+        "severity",
+        "userMessageKey",
+        "action",
+        "telemetryEvent",
+        "redaction"
+      ]
+    },
+    {
+      "registryId": "FE-REG-QUERY",
+      "path": "src/contracts/query-keys.js",
+      "exportName": "QUERY_REGISTRY",
+      "owner": "feature-server-state-caching-contract",
+      "requiredFields": [
+        "namespace",
+        "serialization",
+        "identity",
+        "invalidation",
+        "version",
+        "persistence"
+      ]
+    },
+    {
+      "registryId": "FE-REG-TELEMETRY",
+      "path": "src/contracts/telemetry.js",
+      "exportName": "TELEMETRY_REGISTRY",
+      "owner": "feature-frontend-observability-logging-trace-contract",
+      "requiredFields": [
+        "eventName",
+        "trigger",
+        "requiredAttributes",
+        "optionalAttributes",
+        "forbiddenAttributes",
+        "sampling",
+        "delivery"
+      ]
+    },
+    {
+      "registryId": "FE-REG-RELEASE",
+      "path": "src/contracts/release-tokens.js",
+      "exportName": "RELEASE_TOKEN_REGISTRY",
+      "owner": "feature-frontend-release-cache-rollback-contract",
+      "requiredFields": ["token", "source", "compatibilityRole"],
+      "declaredRows": {
+        "appVersion": {
+          "token": "appVersion",
+          "source": "manifest",
+          "compatibilityRole": "human release label"
+        },
+        "buildId": {
+          "token": "buildId",
+          "source": "CI build",
+          "compatibilityRole": "asset and HTML coherence"
+        },
+        "commitSha": {
+          "token": "commitSha",
+          "source": "VCS",
+          "compatibilityRole": "source traceability"
+        },
+        "configSchemaVersion": {
+          "token": "configSchemaVersion",
+          "source": "runtime config schema",
+          "compatibilityRole": "boot compatibility"
+        },
+        "apiContractVersion": {
+          "token": "apiContractVersion",
+          "source": "frontend/backend agreement",
+          "compatibilityRole": "schema compatibility"
+        },
+        "assetManifestHash": {
+          "token": "assetManifestHash",
+          "source": "build output",
+          "compatibilityRole": "chunk integrity"
+        },
+        "releaseId": {
+          "token": "releaseId",
+          "source": "deploy system",
+          "compatibilityRole": "rollback target"
+        },
+        "builtAt": {
+          "token": "builtAt",
+          "source": "CI",
+          "compatibilityRole": "diagnostics only"
+        }
+      }
+    }
+  ],
+  "compatibilityImpact": {
+    "allowed": ["none", "additive", "behavior-change", "breaking"],
+    "current": "additive"
+  }
+}

config/hosting/security-headers.json

@@ -0,0 +1,11 @@
+{
+  "schemaVersion": 1,
+  "headers": {
+    "Content-Security-Policy": "default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; connect-src 'self' https:; font-src 'self'; upgrade-insecure-requests",
+    "Strict-Transport-Security": "max-age=31536000; includeSubDomains",
+    "X-Frame-Options": "DENY",
+    "Referrer-Policy": "strict-origin-when-cross-origin",
+    "X-Content-Type-Options": "nosniff",
+    "Permissions-Policy": "camera=(), microphone=(), geolocation=()"
+  }
+}

docs/contracts/compatibility.md

@@ -0,0 +1,11 @@
+# Contract compatibility and rollback rules
+
+The blocking tuple is `(buildId, configSchemaVersion, apiContractVersion,
+assetManifestHash, releaseId)`. Versions are parsed numerically.
+
+1. additive changes preserve current required fields
+2. breaking changes require a major version bump
+3. persisted cache is discarded unless an explicit tested migration exists
+4. an incompatible config or API contract blocks product mount
+5. rollback restores HTML, assets, runtime config, API compatibility, and
+   release manifest as one coherent set

docs/security/browser-boundary.md

@@ -0,0 +1,13 @@
+# Browser security boundary
+
+The browser bundle is public. Secrets, token lifecycle, raw HTML injection,
+dynamic code execution, untrusted script URLs, and public production source
+maps are prohibited defaults.
+
+`config/hosting/security-headers.json` is the declared header set. Hosting
+verification compares that declaration with live responses. CSP deliberately
+omits `unsafe-inline` and `unsafe-eval`; production code and built assets must
+remain compatible with that baseline.
+
+Route guards are UX hints and client validation does not replace backend
+authorization or validation.

eslint.config.js

@@ -35,6 +35,7 @@ export default [
       "artifacts/**",
       "tests/fixtures/typecheck/**",
       "tests/fixtures/architecture/forbidden/**",
+      "tests/fixtures/security/forbidden/**",
     ],
   },
   eslint.configs.recommended,
@@ -98,4 +99,24 @@ export default [
       ]),
     },
   },
+  {
+    files: ["**/*.{js,jsx}"],
+    rules: {
+      "no-eval": "error",
+      "no-new-func": "error",
+      "no-script-url": "error",
+      "no-restricted-syntax": [
+        "error",
+        {
+          selector: "JSXAttribute[name.name='dangerouslySetInnerHTML']",
+          message: "Raw HTML injection is prohibited by FE-OC-019.",
+        },
+        {
+          selector:
+            "CallExpression[callee.object.name='document'][callee.property.name='createElement'][arguments.0.value='script']",
+          message: "Runtime script construction is prohibited by FE-OC-019.",
+        },
+      ],
+    },
+  },
 ];

package.json

@@ -28,7 +28,10 @@
     "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"
+    "scan:security": "node scripts/security-scan.mjs",
+    "check:browser-security": "node scripts/check-browser-security.mjs",
+    "check:registries": "node scripts/check-registries.mjs",
+    "verify:compatibility": "node scripts/check-compatibility.mjs"
   },
   "dependencies": {
     "@tanstack/react-query": "5.101.4",

schemas/artifacts/registry-snapshot.schema.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "required": [
+    "schemaVersion",
+    "generatedAt",
+    "compatibilityImpact",
+    "failures",
+    "registries"
+  ],
+  "properties": {
+    "schemaVersion": { "const": 1 },
+    "generatedAt": { "type": "string", "format": "date-time" },
+    "compatibilityImpact": {
+      "enum": ["none", "additive", "behavior-change", "breaking"]
+    },
+    "failures": { "type": "array", "maxItems": 0 },
+    "registries": {
+      "type": "array",
+      "minItems": 8,
+      "maxItems": 8,
+      "items": {
+        "type": "object",
+        "required": ["registryId", "owner", "source", "rowCount", "rows"]
+      }
+    }
+  },
+  "additionalProperties": false
+}

scripts/check-browser-security.mjs

@@ -0,0 +1,42 @@
+import { readdir } from "node:fs/promises";
+import { spawnSync } from "node:child_process";
+
+const pnpmCli = /** @type {string} */ (process.env.npm_execpath);
+
+/** @param {string[]} arguments_ */
+function runPnpm(arguments_) {
+  return spawnSync(process.execPath, [pnpmCli, ...arguments_], {
+    encoding: "utf8",
+  });
+}
+
+const allowed = runPnpm([
+  "exec",
+  "eslint",
+  "tests/fixtures/security/allowed",
+  "--no-ignore",
+  "--max-warnings=0",
+]);
+const forbidden = runPnpm([
+  "exec",
+  "eslint",
+  "tests/fixtures/security/forbidden",
+  "--no-ignore",
+  "--max-warnings=0",
+]);
+
+const distFiles = await readdir("dist", { recursive: true });
+const publicSourceMaps = distFiles.filter((file) => String(file).endsWith(".map"));
+
+if (allowed.status !== 0 || forbidden.status === 0 || publicSourceMaps.length > 0) {
+  process.stderr.write(allowed.stderr || allowed.stdout);
+  process.stderr.write(forbidden.stderr || forbidden.stdout);
+  if (publicSourceMaps.length > 0) {
+    process.stderr.write(`Public source maps found: ${publicSourceMaps.join(", ")}\n`);
+  }
+  process.exit(1);
+}
+
+process.stdout.write(
+  "Browser security fixtures: injection rejected, public source maps absent\n",
+);

scripts/check-compatibility.mjs

@@ -0,0 +1,43 @@
+import { mkdir, readFile, writeFile } from "node:fs/promises";
+
+import { classifyObjectSchemaChange } from "../src/application/policies/compatibility.js";
+
+const fixtures = JSON.parse(
+  await readFile("config/compatibility/fixtures.json", "utf8"),
+);
+const results = [];
+
+for (const [family, cases] of Object.entries(fixtures.families)) {
+  for (const expected of ["additive", "breaking"]) {
+    const fixture = cases[expected];
+    const actual = classifyObjectSchemaChange(fixture.before, fixture.after);
+    results.push({ family, expected, actual, passed: actual === expected });
+  }
+}
+
+await mkdir("artifacts/release", { recursive: true });
+await writeFile(
+  "artifacts/release/compatibility.json",
+  `${JSON.stringify(
+    {
+      schemaVersion: 1,
+      generatedAt: new Date().toISOString(),
+      rules: [
+        "additive changes preserve required fields",
+        "breaking changes require version bump and migration, discard, fallback, or rollback",
+        "config and API major versions must match",
+        "incompatible persisted cache is discarded by default",
+        "rollback uses a coherent compatibility tuple",
+      ],
+      results,
+    },
+    null,
+    2,
+  )}\n`,
+);
+
+if (results.some((result) => !result.passed)) {
+  process.stderr.write("Compatibility fixture classification failed.\n");
+  process.exit(1);
+}
+process.stdout.write("Compatibility fixtures: PASS\n");

scripts/check-registries.mjs

@@ -0,0 +1,112 @@
+import { access, mkdir, readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+
+const governance = JSON.parse(
+  await readFile("config/contracts/registry-governance.json", "utf8"),
+);
+const failures = [];
+const owners = new Map();
+const snapshots = [];
+
+for (const specification of governance.registries) {
+  if (owners.has(specification.registryId)) {
+    failures.push(`duplicate owner for ${specification.registryId}`);
+  }
+  owners.set(specification.registryId, specification.owner);
+
+  let rows = specification.declaredRows;
+  try {
+    await access(specification.path);
+    const module = await import(
+      `${pathToFileURL(path.resolve(specification.path)).href}?registry-check=${Date.now()}`
+    );
+    rows = module[specification.exportName];
+  } catch {
+    if (!rows) failures.push(`missing registry source ${specification.path}`);
+  }
+
+  if (!rows || typeof rows !== "object" || Array.isArray(rows)) {
+    failures.push(`${specification.registryId} is not an object registry`);
+    continue;
+  }
+
+  for (const [rowName, row] of Object.entries(rows)) {
+    if (!row || typeof row !== "object" || Array.isArray(row)) {
+      failures.push(`${specification.registryId}.${rowName} is not an object`);
+      continue;
+    }
+    for (const field of specification.requiredFields) {
+      if (!(field in row)) {
+        failures.push(`${specification.registryId}.${rowName} missing ${field}`);
+      }
+    }
+  }
+
+  snapshots.push({
+    registryId: specification.registryId,
+    owner: specification.owner,
+    source: specification.path,
+    rowCount: Object.keys(rows).length,
+    rows,
+  });
+}
+
+const sourceFiles = [
+  "src/application",
+  "src/presentation",
+  "src/domain",
+];
+const adHocPatterns = [
+  { name: "direct fetch", expression: /\bfetch\s*\(/ },
+  { name: "direct localStorage", expression: /\blocalStorage\.(?:get|set|remove)Item/ },
+  { name: "direct import.meta.env", expression: /\bimport\.meta\.env\./ },
+  { name: "raw API path", expression: /["']\/api\// },
+];
+
+/** @param {string} directory */
+async function scanDirectory(directory) {
+  const entries = await import("node:fs/promises").then(({ readdir }) =>
+    readdir(directory, { withFileTypes: true }),
+  );
+  for (const entry of entries) {
+    const target = path.join(directory, entry.name);
+    if (entry.isDirectory()) {
+      await scanDirectory(target);
+      continue;
+    }
+    if (!/\.(js|jsx|mjs)$/.test(entry.name)) continue;
+    const content = await readFile(target, "utf8");
+    for (const pattern of adHocPatterns) {
+      if (pattern.expression.test(content)) {
+        failures.push(`ad-hoc ${pattern.name} in ${target}`);
+      }
+    }
+  }
+}
+
+for (const sourceDirectory of sourceFiles) {
+  await scanDirectory(sourceDirectory);
+}
+
+await mkdir("artifacts/quality", { recursive: true });
+await writeFile(
+  "artifacts/quality/registries.json",
+  `${JSON.stringify(
+    {
+      schemaVersion: 1,
+      generatedAt: new Date().toISOString(),
+      compatibilityImpact: governance.compatibilityImpact.current,
+      failures,
+      registries: snapshots,
+    },
+    null,
+    2,
+  )}\n`,
+);
+
+if (failures.length > 0) {
+  process.stderr.write(`Registry governance failed:\n${failures.join("\n")}\n`);
+  process.exit(1);
+}
+process.stdout.write(`Registry governance: ${snapshots.length} registries PASS\n`);

src/application/policies/compatibility.js

@@ -0,0 +1,102 @@
+export const COMPATIBILITY_TUPLE_FIELDS = Object.freeze([
+  "buildId",
+  "configSchemaVersion",
+  "apiContractVersion",
+  "assetManifestHash",
+  "releaseId",
+]);
+
+/** @param {string} version */
+export function parseNumericVersion(version) {
+  const match = /^(\d+)(?:\.(\d+))?(?:\.(\d+))?$/.exec(version);
+  if (!match) return null;
+  return {
+    major: Number(match[1]),
+    minor: Number(match[2] ?? 0),
+    patch: Number(match[3] ?? 0),
+  };
+}
+
+/** @param {string} supported @param {string} actual */
+export function isVersionCompatible(supported, actual) {
+  const expected = parseNumericVersion(supported);
+  const candidate = parseNumericVersion(actual);
+  if (!expected || !candidate) return false;
+  return (
+    expected.major === candidate.major &&
+    candidate.minor >= expected.minor
+  );
+}
+
+/**
+ * @param {{
+ *   frontend: {
+ *     buildId: string,
+ *     configSchemaVersion: string,
+ *     apiContractVersion: string,
+ *     assetManifestHash: string,
+ *     releaseId: string
+ *   },
+ *   runtime: {
+ *     buildId: string,
+ *     configSchemaVersion: string,
+ *     apiContractVersion: string,
+ *     assetManifestHash: string,
+ *     releaseId: string
+ *   }
+ * }} input
+ */
+export function verifyCompatibilityTuple(input) {
+  const mismatches = [];
+  if (input.frontend.buildId !== input.runtime.buildId) mismatches.push("buildId");
+  if (
+    !isVersionCompatible(
+      input.frontend.configSchemaVersion,
+      input.runtime.configSchemaVersion,
+    )
+  ) {
+    mismatches.push("configSchemaVersion");
+  }
+  if (
+    !isVersionCompatible(
+      input.frontend.apiContractVersion,
+      input.runtime.apiContractVersion,
+    )
+  ) {
+    mismatches.push("apiContractVersion");
+  }
+  if (input.frontend.assetManifestHash !== input.runtime.assetManifestHash) {
+    mismatches.push("assetManifestHash");
+  }
+
+  const releaseWarning =
+    input.frontend.releaseId === input.runtime.releaseId
+      ? null
+      : "releaseId";
+  return Object.freeze({
+    compatible: mismatches.length === 0,
+    mismatches: Object.freeze(mismatches),
+    warnings: Object.freeze(releaseWarning ? [releaseWarning] : []),
+  });
+}
+
+/**
+ * @param {{ required?: string[], properties?: Record<string, unknown> }} before
+ * @param {{ required?: string[], properties?: Record<string, unknown> }} after
+ */
+export function classifyObjectSchemaChange(before, after) {
+  const beforeRequired = new Set(before.required ?? []);
+  const afterRequired = new Set(after.required ?? []);
+  const removedProperties = Object.keys(before.properties ?? {}).filter(
+    (key) => !(key in (after.properties ?? {})),
+  );
+  const addedRequired = [...afterRequired].filter(
+    (key) => !beforeRequired.has(key),
+  );
+  if (removedProperties.length > 0 || addedRequired.length > 0) return "breaking";
+
+  const addedProperties = Object.keys(after.properties ?? {}).filter(
+    (key) => !(key in (before.properties ?? {})),
+  );
+  return addedProperties.length > 0 ? "additive" : "none";
+}

src/presentation/security/safe-text.jsx

@@ -0,0 +1,9 @@
+/**
+ * Untrusted content is rendered as a React text node. HTML interpretation is
+ * intentionally not offered by this template.
+ *
+ * @param {{ value: unknown }} props
+ */
+export function SafeText({ value }) {
+  return <span>{typeof value === "string" ? value : String(value ?? "")}</span>;
+}

tests/component/browser-security.test.jsx

@@ -0,0 +1,53 @@
+// @vitest-environment jsdom
+
+import { render, screen } from "@testing-library/react";
+import { describe, expect, it } from "vitest";
+
+import { SafeText } from "../../src/presentation/security/safe-text.jsx";
+import { assertSafeConfigNames } from "../../src/contracts/env.js";
+import { defineStorageKey } from "../../src/contracts/storage-keys.js";
+import { projectTelemetryEvent } from "../../src/contracts/telemetry.js";
+
+describe("browser security boundary", () => {
+  it("renders untrusted text without script or inline handler injection", () => {
+    render(
+      <SafeText value={'<img src=x onerror="window.compromised=true"><script>x</script>'} />,
+    );
+    expect(screen.getByText(/<img/)).toBeVisible();
+    expect(document.querySelector("script")).toBeNull();
+    expect(document.querySelector("[onerror]")).toBeNull();
+  });
+
+  it("rejects secret-like client configuration names", () => {
+    expect(() => assertSafeConfigNames({ PRIVATE_KEY: "not-public" })).toThrow();
+  });
+
+  it("rejects browser token storage registration", () => {
+    expect(() =>
+      defineStorageKey({
+        logicalName: "SESSION_TOKEN",
+        scope: "auth",
+        name: "session-token",
+        backend: "sessionStorage",
+        classification: "sensitive-forbidden",
+        schemaVersion: 1,
+        ttl: "session",
+        migration: "discard",
+        quotaFallback: "feature-disable",
+      }),
+    ).toThrow();
+  });
+
+  it("drops raw URL/query/token telemetry attributes", () => {
+    const result = projectTelemetryEvent("api.request.failed", {
+      error_kind: "SERVER_FAILURE",
+      http_status_group: "5xx",
+      attempt_count_bucket: "1",
+      route_id: "APP_HOME",
+      raw_url: "https://api.test?token=private",
+      query_string: "token=private",
+    });
+    expect(result.success).toBe(true);
+    expect(JSON.stringify(result)).not.toMatch(/raw_url|query_string|private/);
+  });
+});

tests/fixtures/security/allowed/safe-text.jsx

@@ -0,0 +1,3 @@
+export function Fixture({ value }) {
+  return <span>{value}</span>;
+}

tests/fixtures/security/forbidden/dynamic-script.js

@@ -0,0 +1,5 @@
+export function attachScript(source) {
+  const script = document.createElement("script");
+  script.src = source;
+  document.head.append(script);
+}

tests/fixtures/security/forbidden/eval.js

@@ -0,0 +1 @@
+export const execute = (source) => eval(source);

tests/fixtures/security/forbidden/raw-html.jsx

@@ -0,0 +1,3 @@
+export function RawHtml({ value }) {
+  return <div dangerouslySetInnerHTML={{ __html: value }} />;
+}

tests/unit/compatibility.test.js

@@ -0,0 +1,77 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  classifyObjectSchemaChange,
+  isVersionCompatible,
+  parseNumericVersion,
+  verifyCompatibilityTuple,
+} from "../../src/application/policies/compatibility.js";
+
+describe("contract compatibility", () => {
+  it("uses numeric version parsing rather than lexical comparison", () => {
+    expect(parseNumericVersion("1.10.0")).toEqual({ major: 1, minor: 10, patch: 0 });
+    expect(isVersionCompatible("1.9", "1.10")).toBe(true);
+    expect(isVersionCompatible("1.9", "2.0")).toBe(false);
+    expect(isVersionCompatible("next", "1.0")).toBe(false);
+  });
+
+  it("distinguishes additive and breaking object changes", () => {
+    const base = { required: ["id"], properties: { id: {} } };
+    expect(
+      classifyObjectSchemaChange(base, {
+        required: ["id"],
+        properties: { id: {}, name: {} },
+      }),
+    ).toBe("additive");
+    expect(
+      classifyObjectSchemaChange(base, {
+        required: ["id", "name"],
+        properties: { id: {}, name: {} },
+      }),
+    ).toBe("breaking");
+  });
+
+  it("treats release ID mismatch as a warning when the blocking tuple is coherent", () => {
+    const frontend = {
+      buildId: "build-a",
+      configSchemaVersion: "1.0",
+      apiContractVersion: "1.0",
+      assetManifestHash: "hash-a",
+      releaseId: "release-a",
+    };
+    expect(
+      verifyCompatibilityTuple({
+        frontend,
+        runtime: { ...frontend, releaseId: "release-b" },
+      }),
+    ).toEqual({
+      compatible: true,
+      mismatches: [],
+      warnings: ["releaseId"],
+    });
+  });
+
+  it("blocks mixed build, config, API, or asset tuples", () => {
+    const frontend = {
+      buildId: "build-a",
+      configSchemaVersion: "1.0",
+      apiContractVersion: "1.0",
+      assetManifestHash: "hash-a",
+      releaseId: "release-a",
+    };
+    expect(
+      verifyCompatibilityTuple({
+        frontend,
+        runtime: {
+          ...frontend,
+          buildId: "build-b",
+          configSchemaVersion: "2.0",
+          assetManifestHash: "hash-b",
+        },
+      }),
+    ).toMatchObject({
+      compatible: false,
+      mismatches: ["buildId", "configSchemaVersion", "assetManifestHash"],
+    });
+  });
+});

tests/unit/registry-governance.test.js

@@ -0,0 +1,21 @@
+import { readFile } from "node:fs/promises";
+import { describe, expect, it } from "vitest";
+
+describe("registry governance manifest", () => {
+  it("declares exactly eight single-owner registries and impact labels", async () => {
+    const governance = JSON.parse(
+      await readFile("config/contracts/registry-governance.json", "utf8"),
+    );
+    expect(governance.registries).toHaveLength(8);
+    expect(new Set(governance.registries.map((entry) => entry.registryId)).size).toBe(
+      8,
+    );
+    expect(governance.registries.every((entry) => entry.owner)).toBe(true);
+    expect(governance.compatibilityImpact.allowed).toEqual([
+      "none",
+      "additive",
+      "behavior-change",
+      "breaking",
+    ]);
+  });
+});