opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine

hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.

tools/skills_tool.py

@@ -1032,21 +1032,10 @@ def skill_view(
                     _record(None, categorized_path.with_suffix(".md"))
 
             # Strategy 2: recursive by directory name (catches nested skills
-            # like "foundations/runtime/explore-codebase" called by bare name),
-            # plus frontmatter `name:` lookup. `skills_list()` exposes the
-            # frontmatter name, so `skill_view(name)` must accept it too even
-            # when the on-disk directory is a shorter category/alias.
+            # like "foundations/runtime/explore-codebase" called by bare name).
             for found_skill_md in iter_skill_index_files(search_dir, "SKILL.md"):
                 if found_skill_md.parent.name == name:
                     _record(found_skill_md.parent, found_skill_md)
-                    continue
-                try:
-                    fm_content = found_skill_md.read_text(encoding="utf-8")
-                    fm, _ = _parse_frontmatter(fm_content)
-                except Exception:
-                    fm = {}
-                if fm.get("name") == name:
-                    _record(found_skill_md.parent, found_skill_md)
 
             # Strategy 3: legacy flat <name>.md files anywhere under the dir.
             for found_md in search_dir.rglob(f"{name}.md"):