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/gateway/mod.rs

@@ -26,9 +26,10 @@ pub async fn run_gateway(host: &str, port: u16, config: Config) -> Result<()> {
     let actual_port = listener.local_addr()?.port();
     let addr = format!("{host}:{actual_port}");
 
-    let provider: Arc<dyn Provider> = Arc::from(providers::create_provider(
+    let provider: Arc<dyn Provider> = Arc::from(providers::create_resilient_provider(
         config.default_provider.as_deref().unwrap_or("openrouter"),
         config.api_key.as_deref(),
+        &config.reliability,
     )?);
     let model = config
         .default_model
@@ -97,6 +98,8 @@ pub async fn run_gateway(host: &str, port: u16, config: Config) -> Result<()> {
     }
     println!("  Press Ctrl+C to stop.\n");
 
+    crate::health::mark_component_ok("gateway");
+
     loop {
         let (mut stream, peer) = listener.accept().await?;
         let provider = provider.clone();
@@ -175,6 +178,7 @@ async fn handle_request(
             let body = serde_json::json!({
                 "status": "ok",
                 "paired": pairing.is_paired(),
+                "runtime": crate::health::snapshot_json(),
             });
             let _ = send_json(stream, 200, &body).await;
         }