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/demo.go

@@ -173,10 +173,8 @@ func PreviewFrame(kind string, w, h int) string {
 		m.routerMessages["04a546aa"] = []RouterEntry{
 			{Role: "user", Content: "run the healthcheck and write the script"},
 			{Role: "router", Content: "I'll create the script, then run it."},
-			{Role: "action", Icon: "⏵", Content: "file_write"},
 			{Role: "action", Icon: "✎", Content: "wrote healthcheck.sh  (+4 −0)"},
 			{Role: "action", Icon: "⌘", Content: "approved file_write"},
-			{Role: "action", Icon: "⏵", Content: "shell"},
 			{Role: "action", Icon: "✓", Content: "shell · exit 0"},
 			{Role: "action", Icon: "⊞", Content: "granted file_write · global"},
 			{Role: "router", Content: "Done — script written and the healthcheck passes."},