Utterance award + requirement, and branching dialogue seeding

A dialogue line can award an achievement when reached (granted server-side,
validated against the player's current node so it can't be forged) and an
option can require an achievement to be offered (filtered out of the resolved
tree otherwise). authorGraph gains a branching form (utterance key/parent/
terminal) so option trees — not just linear lines — can be seeded. This is
gaps 1 & 2 for the Barricelli Dobby/Glitch-Hunter dialogues; phone dialing
stays stubbed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/play.tsx

@@ -94,6 +94,8 @@ export function Play() {
   if (!node) return <div className="boot"><div className="seal">GU</div><p>GLITCH UNIVERSITY NETWORK TERMINAL</p><small>{status || 'OPENING CASE FILE…'}</small></div>
   if (node.kind === 'cutscene') return <CutsceneHost componentKey={node.componentKey} label={node.label} onComplete={() => { void advance() }} />
   if (node.kind === 'merit') return <MeritHost componentKey={node.componentKey} label={node.label} awardsFlag={node.awardsFlag} onComplete={() => { void advance() }} />
-  if (node.kind === 'dialogue' && node.utterances) return <DialoguePlayer node={{ utterances: node.utterances, rootId: node.rootId ?? null }} onExit={terminalKey => { void advance(terminalKey) }} />
+  if (node.kind === 'dialogue' && node.utterances) return <DialoguePlayer node={{ utterances: node.utterances, rootId: node.rootId ?? null }}
+    onExit={terminalKey => { void advance(terminalKey) }}
+    onAward={utteranceId => { if (state) void fetch(`/api/playthroughs/${state.playthrough.id}/utterances/${utteranceId}/reach`, { method: 'POST' }) }} />
   return <div className="boot"><div className="seal">GU</div><small>{node.label}</small></div>
 }