ci: stabilize dependency updates and packed fixture versions (#60)

Author: tensornull

.github/ACTIONLINT.md

@@ -20,3 +20,49 @@ ShellCheck is available on the host. A passing local run does not emulate
 GitHub-hosted runners, exercise repository settings, prove secret or environment
 configuration, perform a live CometAPI request, or prove npm Trusted Publishing.
 Those remain separate remote evidence.
+
+## Dependency update review
+
+Dependabot keeps production updates on their existing compatibility policy and
+limits development version updates to minor and patch releases. Toolchain
+major upgrades need a coordinated change that verifies compiler, linter,
+bundler, test runner, and Node.js type compatibility with `npm ci` and
+`npm run verify`. Do not use `--force` or `--legacy-peer-deps` to suppress peer
+dependency conflicts. Security updates remain eligible; the version-update
+filter does not suppress them. See the official
+[Dependabot allow reference](https://docs.github.com/en/code-security/reference/supply-chain-security/dependabot-options-reference#allow).
+
+Packed fixtures declare the supported OpenAI range and select the exact install
+version from the root lock file at runtime. Update their source declarations
+only when intentionally changing the minimum supported range; lock-file patch
+updates do not require copying the new version into each fixture.
+
+GitHub Actions version updates are grouped into one review. Every action
+remains pinned to a full commit SHA. The Publish contract additionally pins the
+parsed executable workflow with `PUBLISH_WORKFLOW_CONTRACT_SHA256` in
+`scripts/release-workflow-validation.mjs`. An action SHA change in
+`publish.yml` must fail that contract until a maintainer reviews the upstream
+action changes and updates the digest in the same change. This is an expected
+release safety check, not a transient failure to retry.
+
+After reviewing the complete Publish workflow diff and each action's upstream
+changes, calculate the candidate digest from the repository root:
+
+```bash
+node --input-type=module <<'EOF'
+import { createHash } from "node:crypto";
+import { readFileSync } from "node:fs";
+import { parse } from "yaml";
+
+const workflow = parse(readFileSync(".github/workflows/publish.yml", "utf8"));
+console.log(createHash("sha256").update(JSON.stringify(workflow)).digest("hex"));
+EOF
+```
+
+Update the constant only after confirming that the reviewed action pins and
+all release gates remain correct. Run `npm run verify` to cover the workflow
+mutation regressions and pinned `actionlint` validation. Do not remove the
+digest check or relax release permissions, immutable-tag checks, environment
+approvals, live request budgets, or publication replay limits. Existing open
+Dependabot branches retain their old contents until refreshed or replaced;
+changing the update policy does not repair those branches by itself.

.github/dependabot.yml

@@ -9,6 +9,14 @@ updates:
       time: "04:00"
       timezone: Etc/UTC
     open-pull-requests-limit: 10
+    allow:
+      - dependency-type: production
+      # Toolchain majors require a coordinated peer-dependency migration.
+      # This filter affects version updates, not security updates.
+      - dependency-type: development
+        update-types:
+          - version-update:semver-minor
+          - version-update:semver-patch
     groups:
       production-dependencies:
         dependency-type: production
@@ -27,3 +35,7 @@ updates:
       time: "04:30"
       timezone: Etc/UTC
     open-pull-requests-limit: 10
+    groups:
+      github-actions:
+        patterns:
+          - "*"

fixtures/commonjs/package.json

@@ -5,6 +5,6 @@
     "test": "node index.cjs"
   },
   "dependencies": {
-    "openai": "6.47.0"
+    "openai": "^6.47.0"
   }
 }

fixtures/esm/package.json

@@ -6,6 +6,6 @@
     "test": "node index.mjs"
   },
   "dependencies": {
-    "openai": "6.47.0"
+    "openai": "^6.47.0"
   }
 }

fixtures/openai-host/package.json

@@ -7,7 +7,7 @@
     "typecheck": "tsc --noEmit --project tsconfig.json && tsc --noEmit --project tsconfig.nonexact.json"
   },
   "dependencies": {
-    "openai": "6.47.0"
+    "openai": "^6.47.0"
   },
   "devDependencies": {
     "typescript": "5.9.3"

scripts/test-fixtures.mjs

@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import { cpSync, existsSync } from "node:fs";
+import { cpSync, existsSync, writeFileSync } from "node:fs";
 import { basename, join, resolve } from "node:path";
 
 import {
@@ -23,15 +23,9 @@ if (tarballArgument !== -1 && !suppliedTarball) {
 const lock = readJSON(join(ROOT, "package-lock.json"));
 const lockedOpenAIVersion = lock.packages["node_modules/openai"]?.version;
 assert.ok(lockedOpenAIVersion, "package-lock.json must lock OpenAI");
-for (const fixture of ["esm", "commonjs", "openai-host"]) {
-  const manifest = readJSON(join(ROOT, "fixtures", fixture, "package.json"));
-  assert.equal(
-    manifest.dependencies?.openai,
-    lockedOpenAIVersion,
-    `${fixture} must pin the locked OpenAI version`,
-  );
-}
-
+const supportedOpenAIRange = readJSON(join(ROOT, "package.json")).dependencies
+  ?.openai;
+assert.ok(supportedOpenAIRange, "package.json must declare OpenAI support");
 try {
   const tarball =
     (suppliedTarball ? resolve(ROOT, suppliedTarball) : undefined) ??
@@ -42,11 +36,31 @@ try {
     cpSync(join(ROOT, "fixtures", fixture), fixtureDirectory, {
       recursive: true,
     });
+    const manifestPath = join(fixtureDirectory, "package.json");
+    const manifest = readJSON(manifestPath);
+    assert.equal(
+      manifest.dependencies?.openai,
+      supportedOpenAIRange,
+      `${fixture} must declare the supported OpenAI range before installation`,
+    );
+    manifest.dependencies.openai = lockedOpenAIVersion;
+    writeFileSync(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);
     run(
       "npm",
       ["install", "--ignore-scripts", "--no-audit", "--no-fund", tarball],
       { cwd: fixtureDirectory },
     );
+    const dependencyTree = JSON.parse(
+      run("npm", ["ls", "openai", "--all", "--json"], {
+        capture: true,
+        cwd: fixtureDirectory,
+      }),
+    );
+    assert.equal(
+      dependencyTree.dependencies?.openai?.version,
+      lockedOpenAIVersion,
+      `${fixture} must install the locked OpenAI version`,
+    );
 
     if (fixture === "openai-host") {
       const nestedOpenAI = join(