fix(desktop): resolve all remaining P1 defects (P1-02/05/06, P1-01 experimental)

- P1-02: Heartbeat auto-initialized in kernel_init for default agent
- P1-05: CloneManager shows warning when deleting active agent + auto-switch
- P1-06: AgentInfo returns soul/system_prompt/temperature/max_tokens
- P1-01: Browser Hand marked experimental (requires Fantoccini bridge)
- Updated DEFECT_LIST.md: all P1 resolved (0 active)
- Updated RELEASE_READINESS.md: all P1 sections reflect current status

crates/zclaw-kernel/src/registry.rs

@@ -81,6 +81,10 @@ impl AgentRegistry {
             message_count: self.message_counts.get(id).map(|c| *c as usize).unwrap_or(0),
             created_at,
             updated_at: Utc::now(),
+            soul: config.soul.clone(),
+            system_prompt: config.system_prompt.clone(),
+            temperature: config.temperature,
+            max_tokens: config.max_tokens,
         })
     }
 

crates/zclaw-types/src/agent.rs

@@ -166,6 +166,10 @@ pub struct AgentInfo {
     pub message_count: usize,
     pub created_at: chrono::DateTime<chrono::Utc>,
     pub updated_at: chrono::DateTime<chrono::Utc>,
+    pub soul: Option<String>,
+    pub system_prompt: Option<String>,
+    pub temperature: Option<f32>,
+    pub max_tokens: Option<u32>,
 }
 
 impl From<AgentConfig> for AgentInfo {
@@ -180,6 +184,10 @@ impl From<AgentConfig> for AgentInfo {
             message_count: 0,
             created_at: chrono::Utc::now(),
             updated_at: chrono::Utc::now(),
+            soul: config.soul,
+            system_prompt: config.system_prompt,
+            temperature: config.temperature,
+            max_tokens: config.max_tokens,
         }
     }
 }