fix(tui): demote gateway log-noise from Activity to info tone

Restore the old-CLI contract where only complete failures tint Activity
red. Everything else is still visible for debugging but no longer
commandeers attention.

- gateway.stderr: always tone='info' (drops the ERRLIKE_RE regex)
- gateway.protocol_error: both pushes demoted to 'info'
- commands.catalog cold-start failure: demoted to 'info'
- approval.request: no longer duplicates the overlay into Activity

Kept as 'error': terminal `error` event, gateway.start_timeout,
gateway-exited, explicit status.update kinds.

ui-tui/src/app/createGatewayEventHandler.ts

@@ -11,7 +11,6 @@ import { patchOverlayState } from './overlayStore.js'
 import { turnController } from './turnController.js'
 import { getUiState, patchUiState } from './uiStore.js'
 
-const ERRLIKE_RE = /\b(error|traceback|exception|failed|spawn)\b/i
 const NO_PROVIDER_RE = /\bNo (?:LLM|inference) provider configured\b/i
 
 const statusFromBusy = () => (getUiState().busy ? 'running…' : 'ready')
@@ -111,7 +110,7 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
           turnController.pushActivity(String(r.warning), 'warn')
         }
       })
-      .catch((e: unknown) => turnController.pushActivity(`command catalog unavailable: ${rpcErrorMessage(e)}`, 'warn'))
+      .catch((e: unknown) => turnController.pushActivity(`command catalog unavailable: ${rpcErrorMessage(e)}`, 'info'))
 
     if (!STARTUP_RESUME_ID) {
       patchUiState({ status: 'forging session…' })
@@ -201,7 +200,7 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
       case 'gateway.stderr': {
         const line = String(ev.payload.line).slice(0, 120)
 
-        turnController.pushActivity(line, ERRLIKE_RE.test(line) ? 'error' : 'warn')
+        turnController.pushActivity(line, 'info')
 
         return
       }
@@ -222,11 +221,11 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
 
         if (!turnController.protocolWarned) {
           turnController.protocolWarned = true
-          turnController.pushActivity('protocol noise detected · /logs to inspect', 'warn')
+          turnController.pushActivity('protocol noise detected · /logs to inspect', 'info')
         }
 
         if (ev.payload?.preview) {
-          turnController.pushActivity(`protocol noise: ${String(ev.payload.preview).slice(0, 120)}`, 'warn')
+          turnController.pushActivity(`protocol noise: ${String(ev.payload.preview).slice(0, 120)}`, 'info')
         }
 
         return
@@ -299,7 +298,6 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
         const description = String(ev.payload.description ?? 'dangerous command')
 
         patchOverlayState({ approval: { command: String(ev.payload.command ?? ''), description } })
-        turnController.pushActivity(`approval needed · ${description}`, 'warn')
         setStatus('approval needed')
 
         return