chore: set up changesets

Add changesets for tracking and versioning skill changes:
- package.json (private) + @changesets/cli and @changesets/changelog-github
- .changeset/config.json using the GitHub release-style changelog
- release workflow that opens a version PR on push to main (no npm publish)
- initial changeset recording recent skill updates

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

.changeset/README.md

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+# 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

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+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.4/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "mattpocock/skills" }
+  ],
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "restricted",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/initial-skill-updates.md

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+---
+"mattpocock-skills": minor
+---
+
+Recent skill updates:
+
+- Add `ask-matt` user-invoked skill for triage and multi-session build guidance.
+- Add `writing-great-skills` skill, with no-op hunting at the sentence level.
+- Add `decision-mapping`, `prefactoring`, and `implement` (PRD-based) skills.
+- Tighten the review skill: fail-fast ref check, single-sourced rules, no-op cuts.
+- Rename terminology from Commands/Skills to User-invoked/Model-invoked across the docs.
+- Remove the `caveman` and `zoom-out` skills and all references.

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  release:
+    name: Version
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Create Version Pull Request
+        uses: changesets/action@v1
+        with:
+          version: npx changeset version
+          commit: "chore: version skills"
+          title: "chore: version skills"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+node_modules

package.json

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+{
+  "name": "mattpocock-skills",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Matt Pocock's agent skills for real engineering",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mattpocock/skills"
+  },
+  "license": "MIT",
+  "scripts": {
+    "changeset": "changeset",
+    "version": "changeset version"
+  },
+  "devDependencies": {
+    "@changesets/changelog-github": "^0.7.0",
+    "@changesets/cli": "^2.30.0"
+  },
+  "packageManager": "npm@10.9.4"
+}