Website with a feedback form that opens GitHub issues, and pi's contributor gate

- site/: landing page, /feedback/ and /privacy/ on Cloudflare Pages
  (frame-control.pages.dev). POST /api/feedback validates the form and opens
  a labelled issue with a fine-grained token; honeypot, minimum fill time and
  KV rate limits keep spam out. Ko-fi donate buttons appear once the page
  name is set in site/public/js/site.js.
- .github: the issue and PR gate from badlogic/pi-mono. New contributors'
  issues and PRs are auto-closed; a maintainer replying lgtmi/lgtm approves
  them via APPROVED_CONTRIBUTORS. Issue templates and CONTRIBUTING.md.
- CI runs the website tests; README points feedback at the form.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.github/workflows/remove-inprogress-on-close.yml

@@ -0,0 +1,34 @@
+# Contributor gate adapted from badlogic/pi-mono (MIT) at 6f7551516b84.
+# See CONTRIBUTING.md for how it works.
+
+name: Remove In Progress Label On Close
+
+on:
+  issues:
+    types: [closed]
+
+jobs:
+  remove-label:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: Remove inprogress label
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const labelName = 'inprogress';
+            const labels = context.payload.issue.labels ?? [];
+            const hasLabel = labels.some((label) => label.name === labelName);
+
+            if (!hasLabel) {
+              console.log(`Issue does not have ${labelName} label`);
+              return;
+            }
+
+            await github.rest.issues.removeLabel({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              name: labelName,
+            });