feat: implement tier 1 quick wins (tool groups, typing, pruning, verbose, think)

Five additive features with no breaking changes:

- Tool groups: group:fs, group:runtime, group:web, group:memory syntactic
  sugar for allow/deny lists in tool policy config
- Typing indicators: Discord sendTyping() and WhatsApp sendStateTyping()
  on message receipt for better UX feedback
- Session pruning: TTL-based auto-cleanup via sessions.ttl config with
  hourly daemon timer and SQLite GROUP BY pruning
- /verbose command: TUI command parser toggle for raw streaming display
- !!think prefix: per-message extended thinking mode wired through
  Anthropic (budget_tokens), OpenAI/GitHub (reasoning_effort), and
  Gemini (thinkingConfig) providers

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

src/frontends/tui/commands.ts

@@ -6,6 +6,7 @@ export type Command =
   | { type: 'fullscreen' }
   | { type: 'compact' }
   | { type: 'usage' }
+  | { type: 'verbose' }
   | { type: 'model'; name?: string; providerModel?: string }
   | { type: 'backend'; provider?: string }
   | { type: 'login'; provider?: string }
@@ -51,6 +52,11 @@ export function parseCommand(input: string): Command | null {
     return { type: 'usage' };
   }
 
+  // Verbose
+  if (trimmed === '/verbose') {
+    return { type: 'verbose' };
+  }
+
   // Model (with optional argument)
   if (trimmed === '/model') {
     return { type: 'model' };
@@ -108,6 +114,7 @@ Commands:
   /reset, /clear, /new   Clear conversation history
   /compact               Compact conversation history
   /usage                 Show token usage and estimated cost
+  /verbose               Toggle verbose mode (show raw streaming and tool output)
   /status                Show session info and token usage
   /fullscreen, /fs       Switch to fullscreen mode
   /transfer <dest>       Transfer session to another frontend
@@ -127,6 +134,7 @@ export const SLASH_COMMANDS = [
   '/new',
   '/compact',
   '/usage',
+  '/verbose',
   '/status',
   '/fullscreen',
   '/fs',
@@ -146,6 +154,7 @@ export const COMMAND_TOOLTIPS: Record<string, string> = {
   '/new': 'Start a new conversation',
   '/compact': 'Compact conversation history to save context space',
   '/usage': 'Show token usage and estimated cost',
+  '/verbose': 'Toggle verbose mode (show raw streaming and tool output)',
   '/status': 'Show session info and token usage',
   '/fullscreen': 'Switch to fullscreen mode',
   '/fs': 'Switch to fullscreen mode',