feat: enhance agent personality, tool guidance, and memory hygiene

- Expand communication style presets (professional, expressive, custom)
- Enrich SOUL.md with human-like tone and emoji-awareness guidance
- Add crash recovery and sub-task scoping guidance to AGENTS.md scaffold
- Add 'Use when / Don't use when' guidance to TOOLS.md and runtime prompts
- Implement memory hygiene system with configurable archiving and retention
- Add MemoryConfig options: hygiene_enabled, archive_after_days, purge_after_days, conversation_retention_days
- Archive old daily memory and session files to archive subdirectories
- Purge old archives and prune stale SQLite conversation rows
- Add comprehensive tests for new features

src/config/mod.rs

@@ -3,6 +3,6 @@ pub mod schema;
 pub use schema::{
     AutonomyConfig, BrowserConfig, ChannelsConfig, ComposioConfig, Config, DiscordConfig,
     GatewayConfig, HeartbeatConfig, IMessageConfig, MatrixConfig, MemoryConfig,
-    ObservabilityConfig, RuntimeConfig, SecretsConfig, SlackConfig, TelegramConfig, TunnelConfig,
-    WebhookConfig,
+    ObservabilityConfig, ReliabilityConfig, RuntimeConfig, SecretsConfig, SlackConfig,
+    TelegramConfig, TunnelConfig, WebhookConfig,
 };