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/config/schema.ts

@@ -33,6 +33,18 @@ const modelConfigSchema = modelConfigBaseSchema.extend({
   fallback: modelConfigBaseSchema.optional(),
 });
 
+const thinkingSchema = z.object({
+  anthropic: z.object({
+    budgetTokens: z.number().default(4096),
+  }).default({}),
+  openai: z.object({
+    reasoningEffort: z.enum(['low', 'medium', 'high']).default('medium'),
+  }).default({}),
+  gemini: z.object({
+    budgetTokens: z.number().default(4096),
+  }).default({}),
+}).default({});
+
 const modelsSchema = z.object({
   local: modelConfigSchema.optional(),
   fast: modelConfigSchema.optional(),
@@ -40,6 +52,7 @@ const modelsSchema = z.object({
   complex: modelConfigSchema.optional(),
   fallback_chain: z.array(z.string()).default(['anthropic']),
   local_providers: z.record(z.string(), modelConfigSchema).optional(),
+  thinking: thinkingSchema,
 });
 
 const backendsSchema = z.object({
@@ -250,6 +263,10 @@ const promptSchema = z.object({
   })).default([]),
 }).default({});
 
+const sessionsSchema = z.object({
+  ttl: z.string().default('30d'),
+}).default({});
+
 export const configSchema = z.object({
   telegram: telegramSchema,
   discord: discordSchema,
@@ -275,6 +292,7 @@ export const configSchema = z.object({
   sandbox: sandboxSchema,
   agent_configs: agentConfigsSchema,
   routing: routingSchema,
+  sessions: sessionsSchema,
 });
 
 export type Config = z.infer<typeof configSchema>;
@@ -300,3 +318,5 @@ export type SandboxConfig = z.infer<typeof sandboxSchema>;
 export type AgentConfigEntry = z.infer<typeof agentConfigEntrySchema>;
 export type RoutingConfig = z.infer<typeof routingSchema>;
 export type ServerConfig = z.infer<typeof serverSchema>;
+export type SessionsConfig = z.infer<typeof sessionsSchema>;
+export type ThinkingConfig = z.infer<typeof thinkingSchema>;