fix: resolve compiler warnings across crates

- Remove unused assignment to final_output_called (returns immediately after)
- Mark cache_config field as #[allow(dead_code)] (reserved for future use)
- Mark print_status_line method as #[allow(dead_code)] (reserved for future use)

crates/g3-core/src/lib.rs

@@ -3434,7 +3434,7 @@ impl<W: UiWriter> Agent<W> {
         let mut any_tool_executed = false; // Track if ANY tool was executed across all iterations
         let mut auto_summary_attempts = 0; // Track auto-summary prompt attempts
         const MAX_AUTO_SUMMARY_ATTEMPTS: usize = 5; // Limit auto-summary retries (increased from 2 for better recovery)
-        let mut final_output_called = false; // Track if final_output was called
+        let final_output_called = false; // Track if final_output was called
         // Note: Session-level duplicate tracking was removed - we only prevent sequential duplicates (DUP IN CHUNK, DUP IN MSG)
         let mut turn_accumulated_usage: Option<g3_providers::Usage> = None; // Track token usage for timing footer
 
@@ -4092,7 +4092,6 @@ impl<W: UiWriter> Agent<W> {
                             // Check if this was a final_output tool call
                             if tool_call.tool == "final_output" {
                                 // Save context window BEFORE returning so the session log includes final_output
-                                final_output_called = true;
                                 self.save_context_window("completed");
                                 
                                 // The summary was already displayed via print_final_output

crates/g3-planner/src/llm.rs

@@ -206,6 +206,7 @@ impl PlannerUiWriter {
     }
     
     /// Clear the current line and print a status message
+    #[allow(dead_code)]
     fn print_status_line(&self, message: &str) {
         // Print status message without overwriting previous content
         // Use println to ensure each status is on its own line

crates/g3-providers/src/anthropic.rs

@@ -125,6 +125,7 @@ pub struct AnthropicProvider {
     model: String,
     max_tokens: u32,
     temperature: f32,
+    #[allow(dead_code)]
     cache_config: Option<String>,
     enable_1m_context: bool,
     thinking_budget_tokens: Option<u32>,