feat: enhance strictness of Rust compiler settings and improve code quality by treating warnings as errors

src/app/subagent/auto.rs

@@ -44,7 +44,7 @@ const QUICK_REVIEW_MAX_STEPS: usize = 2;
 const BG_SUBAGENT_MAX_STEPS: usize = 8;
 
 /// ─── Helpers ───
-
+///
 /// Check whether a file path is worth auto-reviewing (not config/lock/data).
 pub fn is_reviewable_path(path: &str) -> bool {
     let lower = path.to_lowercase();
@@ -81,7 +81,7 @@ fn is_production_code(path: &str) -> bool {
 }
 
 /// ─── Inline Quick Review (synchronous, feeds back to LLM) ───
-
+///
 /// Spawn a lightweight inline code review subagent for the given file.
 ///
 /// The subagent reads the file (read-only), checks for common issues,
@@ -143,7 +143,7 @@ pub fn spawn_quick_review(
 }
 
 /// ─── Background Subagent Spawners (async, report via SystemNote) ───
-
+///
 /// Spawn a background subagent that generates tests for modified files.
 ///
 /// Uses the test-generator prompt and has read-write access so it can