Add the absorption playbook

bin/monorepo absorb runs it: import with history, strip hoisted QA,
write a mirror.yml that closes mirror PRs with a redirect to the
monorepo, banner the README, and create the mirror ruleset (PR-only,
split app bypassed). Applied to all five packages; manual steps
documented in the README.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: loks0n

.github/workflows/mirror.yml

@@ -0,0 +1,20 @@
+name: Mirror
+
+on:
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  redirect:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Redirect pull request to the monorepo
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR: ${{ github.event.pull_request.html_url }}
+        run: |
+          gh pr comment "$PR" --body "Thanks for contributing! This repository is a read-only mirror — development for this library happens in [\`packages/http\`](https://github.com/utopia-php/monorepo/tree/main/packages/http) in the [utopia-php monorepo](https://github.com/utopia-php/monorepo). Please open this pull request there instead."
+          gh pr close "$PR"

README.md

@@ -1,3 +1,6 @@
+> [!IMPORTANT]
+> This repository is a read-only mirror of the [utopia-php monorepo](https://github.com/utopia-php/monorepo). Development happens in [`packages/http`](https://github.com/utopia-php/monorepo/tree/main/packages/http) — please open issues and pull requests there.
+
 <p>
     <img height="45" src="docs/logo.png" alt="Logo">
 </p>