Adventure section: ingest, permalink, digest, emblems, noindex

Pete's side of the Adventure news feed. Receives structured game-event
facts from gogobee, templates them in Pete's warm-reporter voice, and
publishes to a new /adventure section + live Matrix posts.

- adventure.go: bearer ingest + fact-guard + 13 event templates;
  /adventure/{guid} permalink (story.html); per-event SVG emblems at
  /adventure/art/{type}.svg (card image + og:image); NoPush suppresses
  the live Matrix post (cold-start backfill).
- adventure_digest.go: daily BULLETIN roundup at DigestHour (UTC);
  unposted-in-48h = bulletins; marks them digested; per-day ?digest= URL
  avoids canonical dedup.
- config AdventureConfig (enabled/ingest_token/channel/digest_hour);
  web.New takes the seam + a priority poster; started in main.
- adventure theme colors; thumbURL passes through local emblem paths;
  adventure pages are noindex (player-named; gap #5).

Claude-Session: https://claude.ai/code/session_017mEwUmmS7aQTP2NQXj6rUa

internal/web/templates/layout.html

@@ -4,6 +4,8 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{{block "title" .}}{{.SiteTitle}}{{end}}</title>
+  {{if .NoIndex}}<meta name="robots" content="noindex">{{end}}
+  {{if .OGImage}}<meta property="og:image" content="{{.OGImage}}"><meta name="twitter:card" content="summary_large_image">{{end}}
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@400;600;700&display=swap" rel="stylesheet">