fix: log silently dropped errors in compaction and SSH path handling

- Add tracing::warn! when conversation compaction fails (was let _ = e)
- Add tracing::debug! when SSH path canonicalize fails (was let _ = e)

libs/agent/chat/service.rs

@@ -587,7 +587,7 @@ impl ChatService {
                     processed_history = compact_summary.retained;
                 }
                 Err(e) => {
-                    let _ = e;
+                    tracing::warn!(error = %e, "conversation compaction failed, using full history");
                 }
             }
         }

libs/git/ssh/handle.rs

@@ -756,9 +756,7 @@ fn build_git_command(service: GitService, path: PathBuf) -> tokio::process::Comm
     let cwd = match path.canonicalize() {
         Ok(p) => p,
         Err(e) => {
-            // Log and continue with the raw path — the git process will fail
-            // with a clear "repository not found" message rather than panicking here.
-            let _ = e;
+            tracing::debug!(error = %e, "path canonicalize failed, falling back to raw path");
             path.clone()
         }
     };