feat(intelligence): complete Phase 2-3 migration to Rust

Phase 2 - Core Engines:
- Heartbeat Engine: Periodic proactive checks with quiet hours support
- Context Compactor: Token estimation and message summarization
  - CJK character handling (1.5 tokens per char)
  - Rule-based summary generation

Phase 3 - Advanced Features:
- Reflection Engine: Pattern analysis and improvement suggestions
- Agent Identity: SOUL.md/AGENTS.md/USER.md management
  - Proposal-based changes (requires user approval)
  - Snapshot history for rollback

All modules include:
- Tauri commands for frontend integration
- Unit tests
- Re-exported types via mod.rs

Reference: docs/plans/INTELLIGENCE-LAYER-MIGRATION.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src-tauri/src/lib.rs

@@ -21,6 +21,9 @@ mod secure_storage;
 // Memory commands for persistent storage
 mod memory_commands;
 
+// Intelligence Layer (migrated from frontend lib/)
+mod intelligence;
+
 use serde::Serialize;
 use serde_json::{json, Value};
 use std::fs;
@@ -1300,10 +1303,18 @@ pub fn run() {
     // Initialize memory store state
     let memory_state: memory_commands::MemoryStoreState = std::sync::Arc::new(tokio::sync::Mutex::new(None));
 
+    // Initialize intelligence layer state
+    let heartbeat_state: intelligence::HeartbeatEngineState = std::sync::Arc::new(tokio::sync::Mutex::new(std::collections::HashMap::new()));
+    let reflection_state: intelligence::ReflectionEngineState = std::sync::Arc::new(tokio::sync::Mutex::new(intelligence::ReflectionEngine::new(None)));
+    let identity_state: intelligence::IdentityManagerState = std::sync::Arc::new(tokio::sync::Mutex::new(intelligence::AgentIdentityManager::new()));
+
     tauri::Builder::default()
         .plugin(tauri_plugin_opener::init())
         .manage(browser_state)
         .manage(memory_state)
+        .manage(heartbeat_state)
+        .manage(reflection_state)
+        .manage(identity_state)
         .invoke_handler(tauri::generate_handler![
             // OpenFang commands (new naming)
             openfang_status,
@@ -1390,7 +1401,43 @@ pub fn run() {
             memory_commands::memory_stats,
             memory_commands::memory_export,
             memory_commands::memory_import,
-            memory_commands::memory_db_path
+            memory_commands::memory_db_path,
+            // Intelligence Layer commands (Phase 2-3)
+            // Heartbeat Engine
+            intelligence::heartbeat::heartbeat_init,
+            intelligence::heartbeat::heartbeat_start,
+            intelligence::heartbeat::heartbeat_stop,
+            intelligence::heartbeat::heartbeat_tick,
+            intelligence::heartbeat::heartbeat_get_config,
+            intelligence::heartbeat::heartbeat_update_config,
+            intelligence::heartbeat::heartbeat_get_history,
+            // Context Compactor
+            intelligence::compactor::compactor_estimate_tokens,
+            intelligence::compactor::compactor_estimate_messages_tokens,
+            intelligence::compactor::compactor_check_threshold,
+            intelligence::compactor::compactor_compact,
+            // Reflection Engine
+            intelligence::reflection::reflection_init,
+            intelligence::reflection::reflection_record_conversation,
+            intelligence::reflection::reflection_should_reflect,
+            intelligence::reflection::reflection_reflect,
+            intelligence::reflection::reflection_get_history,
+            intelligence::reflection::reflection_get_state,
+            // Agent Identity Manager
+            intelligence::identity::identity_get,
+            intelligence::identity::identity_get_file,
+            intelligence::identity::identity_build_prompt,
+            intelligence::identity::identity_update_user_profile,
+            intelligence::identity::identity_append_user_profile,
+            intelligence::identity::identity_propose_change,
+            intelligence::identity::identity_approve_proposal,
+            intelligence::identity::identity_reject_proposal,
+            intelligence::identity::identity_get_pending_proposals,
+            intelligence::identity::identity_update_file,
+            intelligence::identity::identity_get_snapshots,
+            intelligence::identity::identity_restore_snapshot,
+            intelligence::identity::identity_list_agents,
+            intelligence::identity::identity_delete_agent
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");