Add PR template, Dependabot config, repo metadata

- PR template with café-themed checklist
- Dependabot weekly pip updates
- Repo description, homepage, and topics set

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ashleywolf

.github/PULL_REQUEST_TEMPLATE.md

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+## What's brewing in this PR? ☕
+
+### Description
+<!-- Tell us about this change — what does it add, fix, or improve? -->
+
+
+### Type of change
+- [ ] 🍩 New menu item
+- [ ] 🐛 Bug fix (something was burning in the kitchen)
+- [ ] ✨ New feature
+- [ ] 📝 Documentation update
+- [ ] 🧹 Cleanup / refactor
+
+### Checklist
+- [ ] Tests pass (`pytest tests/ -q`)
+- [ ] PR title is clear and descriptive
+- [ ] I've read [CONTRIBUTING.md](CONTRIBUTING.md)
+
+### Screenshots (if applicable)
+<!-- Drop a screenshot if you changed the UI -->
+
+---
+*Brewed with ❤️ at the Octocat Café*

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: pip
+    directory: "/"
+    schedule:
+      interval: weekly
+    commit-message:
+      prefix: "deps"
+    labels:
+      - "dependencies"