Add Changesets release automation

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets).
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md).

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+    "$schema": "https://unpkg.com/@changesets/config@3.1.3/schema.json",
+    "changelog": "@changesets/cli/changelog",
+    "commit": false,
+    "fixed": [],
+    "linked": [],
+    "access": "public",
+    "baseBranch": "main",
+    "updateInternalDependencies": "patch",
+    "ignore": []
+}

.changeset/tiny-buses-sparkle.md

@@ -0,0 +1,5 @@
+---
+'opencode-posthog': minor
+---
+
+Add Changesets-based versioning, changelog generation, and automated GitHub releases for npm publishing.

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+name: Release
+
+on:
+    push:
+        branches: [main]
+    workflow_dispatch:
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+permissions:
+    contents: write
+    pull-requests: write
+    id-token: write
+
+jobs:
+    release:
+        name: Release
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v6
+              with:
+                  fetch-depth: 0
+
+            - name: Setup Node.js
+              uses: actions/setup-node@v6
+              with:
+                  node-version: 24
+                  registry-url: https://registry.npmjs.org
+                  package-manager-cache: false
+
+            - name: Setup environment
+              uses: ./.github/actions/setup
+
+            - name: Create Release Pull Request or Publish to npm
+              uses: changesets/action@v1
+              with:
+                  publish: bun run release
+                  commit: Version packages
+                  title: Version packages
+              env:
+                  GITHUB_TOKEN: ${{ github.token }}
+                  NPM_CONFIG_PROVENANCE: true

README.md

@@ -27,6 +27,18 @@ Place the plugin source in your project's `.opencode/plugins/` directory (or `~/
 }
 ```
 
+## Releasing
+
+For publishable changes, add a changeset with:
+
+```sh
+bun run changeset
+```
+
+Merges to `main` open or update a Changesets release pull request with the pending version and changelog updates. Merging that release pull request publishes the package to npm and creates a GitHub release.
+
+Routine CI, config, or docs-only changes do not need a changeset unless a maintainer decides they should be released. This repo does not add PR-level changeset enforcement.
+
 ## Configuration
 
 All configuration is via environment variables:

package.json

@@ -37,7 +37,9 @@
     "homepage": "https://github.com/Quantumlyy/opencode-posthog#readme",
     "scripts": {
         "build": "bun build src/index.ts --outdir dist --target node",
+        "changeset": "changeset",
         "prepublishOnly": "bun run build",
+        "release": "changeset publish",
         "test": "vitest run",
         "test:watch": "vitest",
         "typecheck": "tsc --noEmit",
@@ -51,6 +53,7 @@
         "@opencode-ai/plugin": "*"
     },
     "devDependencies": {
+        "@changesets/cli": "^2.30.0",
         "@opencode-ai/plugin": "*",
         "@opencode-ai/sdk": "*",
         "@types/bun": "^1.3.0",