diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..a71e14e
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,28 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment include welcoming language, respectful communication, and constructive feedback.
+
+Examples of unacceptable behavior include harassment, trolling, and publishing others' private information.
+
+## Enforcement Responsibilities
+
+Project maintainers are responsible for clarifying and enforcing our standards.
+
+## Scope
+
+This Code of Conduct applies within all community spaces and in public when an individual is officially representing the project.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the maintainers.
+The maintainers will review and respond as appropriate.
+
+## Attribution
+
+This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..356ee03
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,42 @@
+# Contributing to @sigrea/react
+
+Thank you for contributing! This project uses a PR-based workflow with required CI checks.
+
+## Requirements
+
+Node.js >= 20 and pnpm >= 10.
+TypeScript strict mode, Biome for formatting, Vitest for tests.
+
+## Scripts
+
+`pnpm typecheck` — run TypeScript checks
+`pnpm test` — run unit tests
+`pnpm build` — build the library via unbuild
+`pnpm format` — check formatting (no writes)
+`pnpm format:fix` — apply formatting
+
+## Commit Convention
+
+Conventional Commits are required. Examples: `feat: ...`, `fix(scope): ...`, `docs: ...`.
+The main branch uses squash merges, so the PR title becomes the final commit message.
+
+## Changelog Entries
+
+Changelogen reads Conventional Commits directly, so please keep commit messages descriptive. Any user-facing change (features, fixes, deprecations, breaking updates) should have a clear `feat`, `fix`, or similar commit. Non-user-facing changes can use `chore`, `test`, etc. For PRs that squash multiple commits, summarize the user impact in the PR description so release managers can double-check the changelog entry.
+
+## Pull Requests
+
+Ensure the following before requesting review:
+CI passes (test/typecheck/build/format) and the PR title follows Conventional Commits.
+
+## Release Workflow
+
+This repository now uses [changelogen](https://github.com/unjs/changelogen) to infer the next semantic version from Conventional Commits, update `CHANGELOG.md`, and create the release commit plus tag. The workflow is intentionally linear so that a single maintainer can ship safely end to end.
+
+1. Ensure `main` is up to date and clean. Run `pnpm changelog --no-output` if you want to preview the generated notes without touching the tree.
+2. Execute `pnpm release`. This script runs `pnpm test`, `pnpm build`, and `changelogen --release` in sequence. The command bumps the version in `package.json`, rewrites `CHANGELOG.md`, and creates a `chore(release): vX.Y.Z` commit alongside the annotated `vX.Y.Z` tag.
+   - If you want to force a bump level or a specific version, run changelogen directly (recommended): `pnpm exec changelogen --release --minor` or `pnpm exec changelogen --release -r 0.4.0`.
+3. Push the commit and tag together: `git push origin main --follow-tags`. If you need to stage multiple release commits, push in chronological order so tags stay in sync.
+4. Tag pushes trigger `.github/workflows/publish.yml` automatically. The job runs on the `release` environment, installs dependencies, executes tests/type checks/build, publishes to npm via OIDC trusted publishing, and then calls `pnpm exec changelogen gh release vX.Y.Z --token $GITHUB_TOKEN` to sync the GitHub Release body with the freshly updated `CHANGELOG.md`.
+
+If the publish workflow fails, fix the root cause and re-run the job from the GitHub Actions UI. Avoid creating a new tag unless you intend to cut a new release. If you must roll back, delete the tag locally and remotely, revert the release commit, and start over from step 1.
diff --git a/README.md b/README.md
index b6722eb..ae6ad1a 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@
   - [useDeepSignal](#usedeepsignal)
   - [useMolcule](#usemolcule)
 - [Testing](#testing)
+- [Handling Scope Cleanup Errors](#handling-scope-cleanup-errors)
 - [Development](#development)
 - [License](#license)
 
@@ -68,7 +69,7 @@ const CounterMolecule = molecule((props: { initialCount: number }) => {
 });
 
 export function Counter(props: { initialCount: number }) {
-  const counter = useMolcule(CounterMolcule, props);
+  const counter = useMolcule(CounterMolecule, props);
   const value = useSignal(counter.count);
 
   return (
@@ -160,6 +161,32 @@ it("increments and displays the updated count", () => {
 });
 ```
 
+## Handling Scope Cleanup Errors
+
+For global error handling configuration, see [@sigrea/core - Handling Scope Cleanup Errors](https://github.com/sigrea/core#handling-scope-cleanup-errors).
+
+In React apps, configure the handler in your application entry point before rendering:
+
+```tsx
+// index.tsx or main.tsx
+import { setScopeCleanupErrorHandler } from "@sigrea/core";
+import { createRoot } from "react-dom/client";
+import { App } from "./App";
+
+setScopeCleanupErrorHandler((error, context) => {
+  console.error(`Cleanup failed:`, error);
+
+  // Forward to monitoring service
+  if (typeof Sentry !== "undefined") {
+    Sentry.captureException(error, {
+      tags: { scopeId: context.scopeId, phase: context.phase },
+    });
+  }
+});
+
+createRoot(document.getElementById("root")!).render(<App />);
+```
+
 ## Development
 
 This repo targets Node.js 20 or later.
@@ -174,9 +201,14 @@ You can also run pnpm scripts directly:
 
 - `pnpm install` — install dependencies.
 - `pnpm test` — run the Vitest suite once (no watch).
+- `pnpm typecheck` — run TypeScript type checking.
+- `pnpm test:coverage` — collect coverage.
 - `pnpm build` — compile via unbuild to produce dual CJS/ESM bundles.
+- `pnpm cicheck` — run CI checks locally.
 - `pnpm dev` — launch the playground counter demo.
 
+See [CONTRIBUTING.md](./CONTRIBUTING.md) for workflow details.
+
 ## License
 
 MIT — see [LICENSE](./LICENSE).
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..36fbff9
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,7 @@
+# Security Policy
+
+Please report vulnerabilities privately via GitHub Security Advisories.
+
+- Submit a private advisory: https://github.com/sigrea/react/security/advisories/new
+
+Do not open public issues for security reports. We will review and respond as appropriate.
diff --git a/mise.toml b/mise.toml
index 8f77ea9..ef13bc1 100644
--- a/mise.toml
+++ b/mise.toml
@@ -20,6 +20,12 @@ run = [
 description = "Preview changelog notes (no file changes)"
 run = "pnpm exec changelogen --no-output"
 
+[tasks.release_patch]
+description = "Cut release commit + tag (force patch)"
+depends = ["ci"]
+confirm = "Create release commit + tag (patch) on main?"
+run = 'test "$(git rev-parse --abbrev-ref HEAD)" = "main" && pnpm exec changelogen --clean --release --patch'
+
 [tasks.release_minor]
 description = "Cut release commit + tag (force minor)"
 depends = ["ci"]
diff --git a/package.json b/package.json
index aaf1e28..4470c9c 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,8 @@
 		"test:coverage": "vitest --coverage",
 		"typecheck": "tsc -p tsconfig.json --noEmit",
 		"format": "biome check .",
-		"format:fix": "biome check --write ."
+		"format:fix": "biome check --write .",
+		"cicheck": "pnpm test && pnpm typecheck && pnpm format:fix"
 	},
 	"peerDependencies": {
 		"@sigrea/core": "^0.4.0",