feat: GitHub issues/PRs/CI dashboard

.github/dashboard/.gitignore

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+site/
+__pycache__/

.github/dashboard/README.md

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+# GitHub Dashboard
+
+## Local Preview
+
+```bash
+cd .github/dashboard
+npm install
+npx tsx src/generate.tsx
+npx serve site -l 8901
+```
+
+For faster iteration, set `maxRuns: 10` in the CI section of `src/config.ts` — full CI fetch takes ~90s.
+
+## Type Check
+
+```bash
+npx tsc --noEmit
+```