fix(skills): route help flags to local dispatch + fix push_output_block test arity

Cherry-pick from Yeachan-Heo's #2945 with manual conflict resolution:
- classify_skills_slash_command now catches -h/--help anywhere in args
- Restored pending_thinking parameter in push_output_block test calls

Co-authored-by: Yeachan-Heo <bellman@ultraworkers.dev>

rust/crates/commands/src/lib.rs

@@ -2490,6 +2490,13 @@ pub fn classify_skills_slash_command(args: Option<&str>) -> SkillSlashDispatch {
         None | Some("list" | "help" | "-h" | "--help" | "show" | "info" | "describe") => {
             SkillSlashDispatch::Local
         }
+        Some(args)
+            if args
+                .split_whitespace()
+                .any(|part| matches!(part, "-h" | "--help")) =>
+        {
+            SkillSlashDispatch::Local
+        }
         Some(args) if args == "install" || args.starts_with("install ") => {
             SkillSlashDispatch::Local
         }