fix(tui): make mutating slash paths native and lifecycle-safe

Route /browser, /reload-mcp, /rollback, /stop, /fast, and /busy through direct TUI RPC handlers so state changes hit the live gateway session instead of slash-worker fallback. Add TUI session finalize/reset parity hooks (memory commit + plugin boundaries) and parity matrix tests to keep mutating commands off fallback.

ui-tui/src/gatewayTypes.ts

@@ -288,7 +288,42 @@ export interface ModelOptionsResponse {
 // ── MCP ──────────────────────────────────────────────────────────────
 
 export interface ReloadMcpResponse {
-  ok?: boolean
+  status?: string
+}
+
+export interface ProcessStopResponse {
+  killed?: number
+}
+
+export interface BrowserManageResponse {
+  connected?: boolean
+  url?: string
+}
+
+export interface RollbackCheckpoint {
+  hash: string
+  message?: string
+  timestamp?: string
+}
+
+export interface RollbackListResponse {
+  checkpoints?: RollbackCheckpoint[]
+  enabled?: boolean
+}
+
+export interface RollbackDiffResponse {
+  diff?: string
+  rendered?: string
+  stat?: string
+}
+
+export interface RollbackRestoreResponse {
+  error?: string
+  history_removed?: number
+  message?: string
+  reason?: string
+  restored_to?: string
+  success?: boolean
 }
 
 // ── Subagent events ──────────────────────────────────────────────────