feat(core): device-code auth core — contract, state machine, poll, stream, persistence, popup, client

Framework-agnostic TypeScript core for <CodexAuth>: the /api/codex/* contract
types, a pure auth state machine, a bounded NDJSON stream reader, a tolerant
reentrancy-guarded status poller, SSR-safe session persistence, popup helpers
with login-URL validation, and createCodexClient() wiring them together.
Tokens never touch the browser. 51 tests passing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: sng-asyncfunc

.claude/tsc-cache/cae30c34-cb73-4190-8637-42d1275ba2e1/affected-repos.txt

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+root
+src

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [20, 22]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+      - run: npm install
+      - run: npm run typecheck
+      - run: npm run build
+      - run: npm test

.gitignore

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+node_modules/
+dist/
+*.log
+.env
+.DS_Store
+.claude/worktrees/

LICENSE

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+MIT License
+
+Copyright (c) 2026 codex-auth contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

docs/plans/2026-06-27-001-feat-codexauth-component-plan.md

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+// Minimal flat ESLint config. Kept intentionally light for v1 — the build's
+// `tsc --noEmit` typecheck is the primary correctness gate.
+export default [
+  {
+    ignores: ["dist/**", "node_modules/**"],
+  },
+];