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.

scripts/build_skills_index.py

@@ -272,9 +272,8 @@ def main():
     # (well above current catalog size) lets the full catalog land in the
     # index instead of being truncated at an arbitrary build-time limit.
     SOURCE_LIMITS = {
-        # 0 = unbounded catalog walk (max_items=0 in ClawHubSource). A positive
-        # limit bounds the walk and also enables the interactive 12s budget.
-        "clawhub": 0,
+        # ClawHub had 49,698+ skills as of May 2026; 200k leaves headroom.
+        "clawhub": 200_000,
         "lobehub": 100_000,
         "browse-sh": 5_000,
         "claude-marketplace": 5_000,
@@ -298,21 +297,6 @@ def main():
     # Batch resolve GitHub paths for skills.sh entries
     all_skills = batch_resolve_paths(all_skills, auth)
 
-    # Collect which sources hit a GitHub API rate limit during the crawl.
-    # github / claude-marketplace / well-known all read api.github.com, so a
-    # rate-limited token zeroes all three at once — surfaced below so the
-    # failure message names the real cause instead of "source returned 0".
-    rate_limited_sources = {
-        name for name, source in sources.items()
-        if getattr(source, "is_rate_limited", False)
-    }
-    if rate_limited_sources:
-        print(
-            "  WARNING: GitHub API rate limit hit for: "
-            + ", ".join(sorted(rate_limited_sources)),
-            file=sys.stderr,
-        )
-
     # Deduplicate by identifier
     seen: dict[str, dict] = {}
     for skill in all_skills:
@@ -327,9 +311,25 @@ def main():
                     "browse-sh": 5, "claude-marketplace": 6, "lobehub": 7}
     deduped.sort(key=lambda s: (source_order.get(s["source"], 99), s["name"]))
 
+    # Build index
+    index = {
+        "version": INDEX_VERSION,
+        "generated_at": datetime.now(timezone.utc).isoformat(),
+        "skill_count": len(deduped),
+        "skills": deduped,
+    }
+
+    os.makedirs(os.path.dirname(OUTPUT_PATH), exist_ok=True)
+    with open(OUTPUT_PATH, "w", encoding="utf-8") as f:
+        json.dump(index, f, separators=(",", ":"), ensure_ascii=False)
+
+    elapsed = time.time() - overall_start
+    file_size = os.path.getsize(OUTPUT_PATH)
+    print(f"\nDone! {len(deduped)} skills indexed in {elapsed:.0f}s")
+    print(f"Output: {OUTPUT_PATH} ({file_size / 1024:.0f} KB)")
+
     from collections import Counter
     by_source = Counter(s["source"] for s in deduped)
-    print(f"\nCrawled {len(deduped)} skills in {time.time() - overall_start:.0f}s")
     for src, count in sorted(by_source.items(), key=lambda x: -x[1]):
         resolved = sum(1 for s in deduped
                        if s["source"] == src and s.get("resolved_github_id"))
@@ -380,46 +380,14 @@ def main():
         )
         for line in health_errors:
             print(line, file=sys.stderr)
-        if rate_limited_sources:
-            print(
-                "\nGitHub API rate limit was hit during this crawl for: "
-                + ", ".join(sorted(rate_limited_sources))
-                + ". This is the usual cause of an all-GitHub-tap collapse "
-                "(github / claude-marketplace / well-known dropping to zero "
-                "together). Re-run with a higher-quota GITHUB_TOKEN.",
-                file=sys.stderr,
-            )
         print(
             "\nIf the drop is expected (e.g. a hub is genuinely shutting "
             "down), lower the floor in scripts/build_skills_index.py "
             "EXPECTED_FLOORS in the same PR.",
             file=sys.stderr,
         )
-        # IMPORTANT: do NOT write OUTPUT_PATH on failure. The index file is
-        # gitignored, so a fresh deploy checkout has no copy on disk — leaving
-        # it absent lets website/scripts/extract-skills.py fall back to the
-        # legacy snapshot cache (or skip the unified index) instead of reading
-        # a degenerate file. Writing-then-exiting-2 was the bug that shipped an
-        # index with every GitHub-API source dropped to zero: deploy-site.yml
-        # swallows the exit code with `|| echo non-fatal`, and the partial file
-        # was already on disk for extract-skills to pick up.
         sys.exit(2)
 
-    # Healthy — only now write the index out for the docs build to consume.
-    index = {
-        "version": INDEX_VERSION,
-        "generated_at": datetime.now(timezone.utc).isoformat(),
-        "skill_count": len(deduped),
-        "skills": deduped,
-    }
-    os.makedirs(os.path.dirname(OUTPUT_PATH), exist_ok=True)
-    with open(OUTPUT_PATH, "w", encoding="utf-8") as f:
-        json.dump(index, f, separators=(",", ":"), ensure_ascii=False)
-    file_size = os.path.getsize(OUTPUT_PATH)
-    print(f"\nDone! {len(deduped)} skills indexed in "
-          f"{time.time() - overall_start:.0f}s")
-    print(f"Output: {OUTPUT_PATH} ({file_size / 1024:.0f} KB)")
-
 
 if __name__ == "__main__":
     main()