feat(session): persist model tier overrides per session

Store per-session config in SQLite and route /model and /reset through command fast-paths so channel sessions keep independent model selection across reconnects and restarts.

src/cli/tui.ts

@@ -82,7 +82,7 @@ export function registerTuiCommand(program: Command): void {
       setLogLevel(tuiLogLevel);
       const { MinimalTui, startFullscreenTui } = await import('../frontends/tui/index.js');
       const { NativeAgent } = await import('../backends/index.js');
-      const { ToolRegistry, ToolExecutor, allBuiltinTools, createWebSearchTools, createProcessTools, ProcessManager, createGmailTools, createGcalTools, createGdocsTools, createGdriveTools, createGtasksTools } = await import('../tools/index.js');
+      const { ToolRegistry, ToolExecutor, ToolPolicy, allBuiltinTools, createWebSearchTools, createProcessTools, ProcessManager, createGmailTools, createGcalTools, createGdocsTools, createGdriveTools, createGtasksTools } = await import('../tools/index.js');
       const { HookEngine } = await import('../hooks/index.js');
       const { createModelRouter } = await import('../daemon/index.js');
 
@@ -174,6 +174,8 @@ export function registerTuiCommand(program: Command): void {
         }
       }
 
+      toolRegistry.setPolicy(new ToolPolicy(config.tools));
+
       const toolExecutor = new ToolExecutor(toolRegistry, hookEngine);
 
       const session = sessionManager.getSession('tui', 'local');