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/handlers.go

@@ -105,6 +105,8 @@ type pageData struct {
 	PushEnabled    bool         // Web Push is configured (shows the notifications toggle to signed-in users)
 	PushPublicKey  string       // VAPID public key handed to the client to subscribe
 	TTS            template.JS  // JSON {enabled, default, voices:[{id,label}]} for read-aloud, or "null"
+	NoIndex        bool         // emit <meta name="robots" content="noindex"> — used by the adventure section
+	OGImage        string       // absolute og:image URL for link unfurls (adventure emblem); "" = none
 }
 
 type channelPage struct {
@@ -327,6 +329,9 @@ func (s *Server) handleChannel(w http.ResponseWriter, r *http.Request, ch Channe
 
 	base := s.base(r)
 	base.Active = ch.Slug
+	// The adventure section names player characters; keep it out of search
+	// indexes to bound the cached-forever exposure (see plan gap #5).
+	base.NoIndex = ch.Slug == "adventure"
 	data := channelPage{
 		pageData: base,
 		Channel:  ch,