Revert tmux config default isolation to inline

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/config/schema/tmux.ts

@@ -20,7 +20,7 @@ export const TmuxConfigSchema = z.object({
   main_pane_size: z.number().min(20).max(80).default(60),
   main_pane_min_width: z.number().min(40).default(120),
   agent_pane_min_width: z.number().min(20).default(40),
-  isolation: TmuxIsolationSchema.default("session"),
+  isolation: TmuxIsolationSchema.default("inline"),
 })
 
 export type TmuxConfig = z.infer<typeof TmuxConfigSchema>