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/agent/loop_.rs

@@ -39,7 +39,7 @@ pub async fn run(
     // ── Wire up agnostic subsystems ──────────────────────────────
     let observer: Arc<dyn Observer> =
         Arc::from(observability::create_observer(&config.observability));
-    let _runtime = runtime::create_runtime(&config.runtime);
+    let _runtime = runtime::create_runtime(&config.runtime)?;
     let security = Arc::new(SecurityPolicy::from_config(
         &config.autonomy,
         &config.workspace_dir,
@@ -72,8 +72,11 @@ pub async fn run(
         .or(config.default_model.as_deref())
         .unwrap_or("anthropic/claude-sonnet-4-20250514");
 
-    let provider: Box<dyn Provider> =
-        providers::create_provider(provider_name, config.api_key.as_deref())?;
+    let provider: Box<dyn Provider> = providers::create_resilient_provider(
+        provider_name,
+        config.api_key.as_deref(),
+        &config.reliability,
+    )?;
 
     observer.record_event(&ObserverEvent::AgentStart {
         provider: provider_name.to_string(),
@@ -83,12 +86,30 @@ pub async fn run(
     // ── Build system prompt from workspace MD files (OpenClaw framework) ──
     let skills = crate::skills::load_skills(&config.workspace_dir);
     let mut tool_descs: Vec<(&str, &str)> = vec![
-        ("shell", "Execute terminal commands"),
-        ("file_read", "Read file contents"),
-        ("file_write", "Write file contents"),
-        ("memory_store", "Save to memory"),
-        ("memory_recall", "Search memory"),
-        ("memory_forget", "Delete a memory entry"),
+        (
+            "shell",
+            "Execute terminal commands. Use when: running local checks, build/test commands, diagnostics. Don't use when: a safer dedicated tool exists, or command is destructive without approval.",
+        ),
+        (
+            "file_read",
+            "Read file contents. Use when: inspecting project files, configs, logs. Don't use when: a targeted search is enough.",
+        ),
+        (
+            "file_write",
+            "Write file contents. Use when: applying focused edits, scaffolding files, updating docs/code. Don't use when: side effects are unclear or file ownership is uncertain.",
+        ),
+        (
+            "memory_store",
+            "Save to memory. Use when: preserving durable preferences, decisions, key context. Don't use when: information is transient/noisy/sensitive without need.",
+        ),
+        (
+            "memory_recall",
+            "Search memory. Use when: retrieving prior decisions, user preferences, historical context. Don't use when: answer is already in current context.",
+        ),
+        (
+            "memory_forget",
+            "Delete a memory entry. Use when: memory is incorrect/stale or explicitly requested for removal. Don't use when: impact is uncertain.",
+        ),
     ];
     if config.browser.enabled {
         tool_descs.push((