feat(tui): improve tool use display and register Gmail tools

Format tool names as human-readable labels (e.g. "Gmail: List") and
show args as compact key-value pairs instead of raw JSON. Also register
Gmail tools in the TUI when automation.gmail is enabled.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/tui.ts

@@ -13,8 +13,38 @@ const toolColors = {
   cyan: '\x1b[36m',
   green: '\x1b[32m',
   red: '\x1b[31m',
+  bold: '\x1b[1m',
 };
 
+/** Format a tool name like "gmail.list" → "Gmail: List" */
+function formatToolName(name: string): string {
+  const parts = name.split('.');
+  return parts.map((p, i) => {
+    const capitalized = p.charAt(0).toUpperCase() + p.slice(1);
+    return i === 0 && parts.length > 1 ? capitalized + ':' : capitalized;
+  }).join(' ');
+}
+
+/** Format tool args as a compact, readable summary instead of raw JSON. */
+function formatToolArgs(args: unknown): string {
+  if (!args || typeof args !== 'object') return '';
+  const entries = Object.entries(args as Record<string, unknown>);
+  if (entries.length === 0) return '';
+
+  const parts = entries.map(([key, value]) => {
+    if (typeof value === 'string') {
+      const display = value.length > 60 ? value.slice(0, 57) + '...' : value;
+      return `${key}: "${display}"`;
+    }
+    if (typeof value === 'number' || typeof value === 'boolean') {
+      return `${key}: ${value}`;
+    }
+    return `${key}: ${JSON.stringify(value)}`;
+  });
+
+  return parts.join(', ');
+}
+
 function loadSystemPrompt(): string {
   const paths = [
     resolve(process.cwd(), 'SOUL.md'),
@@ -48,7 +78,7 @@ export function registerTuiCommand(program: Command): void {
       setLogLevel(config.log_level);
       const { MinimalTui, startFullscreenTui } = await import('../frontends/tui/index.js');
       const { NativeAgent } = await import('../backends/index.js');
-      const { ToolRegistry, ToolExecutor, allBuiltinTools, createWebSearchTools, createProcessTools, ProcessManager } = await import('../tools/index.js');
+      const { ToolRegistry, ToolExecutor, allBuiltinTools, createWebSearchTools, createProcessTools, ProcessManager, createGmailTools } = await import('../tools/index.js');
       const { HookEngine } = await import('../hooks/index.js');
       const { createModelRouter } = await import('../daemon/index.js');
 
@@ -97,6 +127,13 @@ export function registerTuiCommand(program: Command): void {
         toolRegistry.register(tool);
       }
 
+      // Register Gmail tools if configured
+      if (config.automation.gmail?.enabled) {
+        for (const tool of createGmailTools(config.automation.gmail)) {
+          toolRegistry.register(tool);
+        }
+      }
+
       const toolExecutor = new ToolExecutor(toolRegistry, hookEngine);
 
       const session = sessionManager.getSession('tui', 'local');
@@ -109,8 +146,9 @@ export function registerTuiCommand(program: Command): void {
         toolExecutor,
         onToolUse: (event) => {
           if (event.type === 'start') {
-            const argsStr = event.args ? ` ${toolColors.dim}${JSON.stringify(event.args)}${toolColors.reset}` : '';
-            process.stdout.write(`${toolColors.cyan}> ${event.tool}${toolColors.reset}${argsStr}\n`);
+            const label = formatToolName(event.tool);
+            const argsStr = event.args ? ` ${toolColors.dim}(${formatToolArgs(event.args)})${toolColors.reset}` : '';
+            process.stdout.write(`${toolColors.cyan}> ${toolColors.bold}${label}${toolColors.reset}${argsStr}\n`);
           } else if (event.type === 'end' && event.result) {
             const icon = event.result.success ? `${toolColors.green}done` : `${toolColors.red}error`;
             const detail = event.result.success