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.test.ts

@@ -34,6 +34,10 @@ describe('parseCommand', () => {
     expect(parseCommand('/usage')).toEqual({ type: 'usage' });
   });
 
+  it('parses /verbose command', () => {
+    expect(parseCommand('/verbose')).toEqual({ type: 'verbose' });
+  });
+
   it('parses /model command without argument', () => {
     expect(parseCommand('/model')).toEqual({ type: 'model' });
   });
@@ -100,6 +104,7 @@ describe('getHelpText', () => {
     expect(help).toContain('/reset');
     expect(help).toContain('/compact');
     expect(help).toContain('/usage');
+    expect(help).toContain('/verbose');
     expect(help).toContain('/quit');
   });
 });