Crow personas and generated banter

- personas.go: backstory, prompt policy and output policy per crow;
  Hugin and Munin grounded in Grimnismal 20 and Gylfaginning 38;
  every working crow also follows a common output policy
- Personas go into each crow's instructions; Sentry keeps JSON-only
- banter.go: retrieve backstory, relationships and recent flock
  memory, then the speaking crow generates one line in character;
  max 2 per list against the list budget, never blocks work,
  unusable lines dropped
- crow.banter event, GET /api/crows, `crows personas` -> PERSONAS.md
- UI: epithets on tiles and messages, banter as quiet asides

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UQnSw4RRWp8uqpj3nsnnXF

flock.go

@@ -196,7 +196,7 @@ func (f *Flock) Triage(ctx context.Context, w Watcher, item string, budgets ...*
 }
 
 func (f *Flock) llmTriage(ctx context.Context, w Watcher, item string, budgets ...*Budget) (Triage, error) {
-	text, err := f.ask(ctx, w, "Sentry", sentrySystem, "ITEM: "+item, budgets...)
+	text, err := f.ask(ctx, w, "Sentry", systemFor("Sentry", sentrySystem, false), "ITEM: "+item, budgets...)
 	if err != nil {
 		return Triage{}, err
 	}
@@ -256,7 +256,7 @@ func (f *Flock) Execute(ctx context.Context, w Watcher, item string, t Triage, n
 		return f.reconcile(ctx, w, item, crows, tasks, reports, budgets...)
 	default:
 		c := f.pick(nest, 1)[0]
-		ans, err := f.ask(ctx, w, c, crowSystem, "TASK: "+item, budgets...)
+		ans, err := f.ask(ctx, w, c, systemFor(c, crowSystem, true), "TASK: "+item, budgets...)
 		return Outcome{Answer: ans, Crows: []string{c}}, err
 	}
 }
@@ -269,7 +269,7 @@ func (f *Flock) fanOut(ctx context.Context, w Watcher, crows, tasks []string, bu
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			reports[i], errs[i] = f.ask(ctx, w, crows[i], crowSystem, "TASK: "+tasks[i], budgets...)
+			reports[i], errs[i] = f.ask(ctx, w, crows[i], systemFor(crows[i], crowSystem, true), "TASK: "+tasks[i], budgets...)
 		}()
 	}
 	wg.Wait()
@@ -293,6 +293,6 @@ func (f *Flock) reconcile(ctx context.Context, w Watcher, item string, crows, ta
 	for i := range reports {
 		fmt.Fprintf(&sb, "--- %s on %q:\n%s\n\n", crows[i], tasks[i], reports[i])
 	}
-	ans, err := f.ask(ctx, w, "Elder", elderSystem, sb.String(), budgets...)
+	ans, err := f.ask(ctx, w, "Elder", systemFor("Elder", elderSystem, true), sb.String(), budgets...)
 	return Outcome{Answer: ans, Crows: append(append([]string{}, crows...), "Elder")}, err
 }