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skeleton/CONTRIBUTING.md

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+# Contributing — url-shortener
+
+Standalone service. **All API and deploy code changes happen in this repository**, not as loose files in the android_cast monorepo.
+
+**Remote:** `git://f0xx.org/androidcast_project/url-shortener`  
+**Default branch:** `next`
+
+## Workflow
+
+```bash
+cd backend/url-shortener   # when cloned as submodule
+git checkout next
+git pull origin next
+
+# develop …
+./scripts/run-php-tests.sh
+export BEARER=… ./scripts/smoke_shorten.sh
+
+git add -A
+git commit -m "your message"
+git push origin next
+```
+
+Then in the **android_cast** parent repo:
+
+```bash
+cd ../..   # monorepo root
+git add backend/url-shortener
+git commit -m "Bump url-shortener submodule"
+git push origin <branch>
+```
+
+## Deploy (BE)
+
+See [DEPLOY.md](DEPLOY.md). Sync this tree to `/var/www/localhost/htdocs/apps/s/` — no crashes-console PHP required for the public API.
+
+## Hub admin
+
+Operator UI (mint bearer, list links) is in the monorepo: `examples/crash_reporter/backend/?view=short_links`. That code talks to the same MariaDB `url_shortener` schema; it is **not** part of this repo.
+
+## Docs
+
+Normative SPEC/DR live in the monorepo (`docs/specs/20100611_3_url_shortener.md`). This repo ships implementation + OpenAPI + deploy snippets only.