chore: migrate package manager from npm to pnpm

.gitea/workflows/test.yaml

@@ -13,7 +13,8 @@ jobs:
     - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
       with:
         node-version: '24'
-    - run: npm install
+    - uses: pnpm/action-setup@v4
+    - run: pnpm install --frozen-lockfile
       shell: bash
-    - run: npm test
+    - run: pnpm test
       shell: bash

GEMINI.md

@@ -18,7 +18,7 @@ This project uses [Vitest](https://vitest.dev/) for testing. The tests are locat
 To run the tests locally, use the following command:
 
 ```bash
-npm test
+pnpm test
 ```
 
 ### Testing Pipeline
@@ -28,6 +28,6 @@ The tests are automatically run on every push and workflow dispatch using a Gite
 The Gitea workflow does the following:
 
 1.  Checks out the code.
-2.  Sets up Node.js.
-3.  Installs the dependencies using `npm install`.
-4.  Runs the tests using `npm test`.
+2.  Sets up Node.js and pnpm.
+3.  Installs the dependencies using `pnpm install`.
+4.  Runs the tests using `pnpm test`.

README.md

@@ -84,7 +84,7 @@ This project includes a build step to prepare the action for use.
 ### Why a Build Step?
 
 We use a build step to compile the JavaScript code and its dependencies into a single, self-contained file (`dist/index.js`). This approach is chosen for the following reasons:
-1.  **Zero-configuration at Runtime:** By bundling everything, the action runner doesn't need to run `npm install`, which speeds up the action execution.
+1.  **Zero-configuration at Runtime:** By bundling everything, the action runner doesn't need to run `pnpm install` or `npm install`, which speeds up the action execution.
 2.  **Reliability:** It guarantees that the exact versions of dependencies tested during development are used in the action, avoiding potential issues with version updates or missing packages.
 3.  **Standard Practice:** This is a recommended practice for JavaScript-based GitHub/Gitea Actions.
 
@@ -100,8 +100,8 @@ We chose [`@vercel/ncc`](https://github.com/vercel/ncc) as the compiler because:
 If you modify `index.js` or change dependencies, you must rebuild the project before committing:
 
 ```bash
-npm install
-npm run build
+pnpm install
+pnpm run build
 ```
 
 This will update the `dist/index.js` file, which should be committed to the repository.

pnpm-workspace.yaml

@@ -0,0 +1,3 @@
+allowBuilds:
+  bufferutil: true
+  utf-8-validate: true

renovate.json

@@ -8,12 +8,12 @@
   "packageRules": [
     {
       "matchManagers": [
-        "npm"
+        "pnpm"
       ],
       "postUpgradeTasks": {
         "commands": [
-          "npm ci",
-          "npm run build"
+          "pnpm install --frozen-lockfile",
+          "pnpm run build"
         ],
         "fileFilters": [
           "dist/index.js"