feat(tui-go): drop inline tool-start rows (keep results only)

The ⏵ tool-start row doubled up with the ✓/✎ result row in OUTPUT. Drop it
inline — tool starts still show in the tool list + EVENTS panel. The inline
transcript now carries only outcomes: ✎ writes, ✓/✗ tool results, ⌘/✕
approvals, ⊞/⊟ grants.

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

apps/tui-go/internal/app/model.go

@@ -67,7 +67,7 @@ const (
 type RouterEntry struct {
 	Role    string // user | router | tool | narration | narration_llm | action
 	Content string
-	Icon    string // action role only: the gutter glyph (⏵ ✓ ✎ ⌘ ✕ ⊞ ⊟)
+	Icon    string // action role only: the gutter glyph (✓ ✎ ✗ ⌘ ✕ ⊞ ⊟)
 	Metrics *TurnMetrics
 }