refactor: extract shared curses checklist, fix skill discovery perf

Four cleanups to code merged today:

1. New hermes_cli/curses_ui.py — shared curses_checklist() used by both
   hermes tools and hermes skills. Eliminates ~140 lines of near-identical
   curses code (scrolling, key handling, color setup, numbered fallback).

2. Fix _find_all_skills() perf — was calling load_config() per skill
   (~100+ YAML parses). Now loads disabled set once via
   _get_disabled_skill_names() and does a set lookup.

3. Eliminate _list_all_skills_unfiltered() duplication — _find_all_skills()
   now accepts skip_disabled=True for the config UI, removing 30 lines
   of copy-pasted discovery logic from skills_config.py.

4. Fix fragile label round-trip in skills_command — was building label
   strings, passing to checklist, then mapping labels back to skill names
   (collision-prone). Now works with indices directly, like tools_config.

hermes_cli/curses_ui.py

@@ -0,0 +1,140 @@
+"""Shared curses-based UI components for Hermes CLI.
+
+Used by `hermes tools` and `hermes skills` for interactive checklists.
+Provides a curses multi-select with keyboard navigation, plus a
+text-based numbered fallback for terminals without curses support.
+"""
+from typing import List, Set
+
+from hermes_cli.colors import Colors, color
+
+
+def curses_checklist(
+    title: str,
+    items: List[str],
+    selected: Set[int],
+    *,
+    cancel_returns: Set[int] | None = None,
+) -> Set[int]:
+    """Curses multi-select checklist. Returns set of selected indices.
+
+    Args:
+        title: Header line displayed above the checklist.
+        items: Display labels for each row.
+        selected: Indices that start checked (pre-selected).
+        cancel_returns: Returned on ESC/q. Defaults to the original *selected*.
+    """
+    if cancel_returns is None:
+        cancel_returns = set(selected)
+
+    try:
+        import curses
+        chosen = set(selected)
+        result_holder: list = [None]
+
+        def _draw(stdscr):
+            curses.curs_set(0)
+            if curses.has_colors():
+                curses.start_color()
+                curses.use_default_colors()
+                curses.init_pair(1, curses.COLOR_GREEN, -1)
+                curses.init_pair(2, curses.COLOR_YELLOW, -1)
+                curses.init_pair(3, 8, -1)  # dim gray
+            cursor = 0
+            scroll_offset = 0
+
+            while True:
+                stdscr.clear()
+                max_y, max_x = stdscr.getmaxyx()
+
+                # Header
+                try:
+                    hattr = curses.A_BOLD
+                    if curses.has_colors():
+                        hattr |= curses.color_pair(2)
+                    stdscr.addnstr(0, 0, title, max_x - 1, hattr)
+                    stdscr.addnstr(
+                        1, 0,
+                        "  ↑↓ navigate  SPACE toggle  ENTER confirm  ESC cancel",
+                        max_x - 1, curses.A_DIM,
+                    )
+                except curses.error:
+                    pass
+
+                # Scrollable item list
+                visible_rows = max_y - 3
+                if cursor < scroll_offset:
+                    scroll_offset = cursor
+                elif cursor >= scroll_offset + visible_rows:
+                    scroll_offset = cursor - visible_rows + 1
+
+                for draw_i, i in enumerate(
+                    range(scroll_offset, min(len(items), scroll_offset + visible_rows))
+                ):
+                    y = draw_i + 3
+                    if y >= max_y - 1:
+                        break
+                    check = "✓" if i in chosen else " "
+                    arrow = "→" if i == cursor else " "
+                    line = f" {arrow} [{check}] {items[i]}"
+                    attr = curses.A_NORMAL
+                    if i == cursor:
+                        attr = curses.A_BOLD
+                        if curses.has_colors():
+                            attr |= curses.color_pair(1)
+                    try:
+                        stdscr.addnstr(y, 0, line, max_x - 1, attr)
+                    except curses.error:
+                        pass
+
+                stdscr.refresh()
+                key = stdscr.getch()
+
+                if key in (curses.KEY_UP, ord("k")):
+                    cursor = (cursor - 1) % len(items)
+                elif key in (curses.KEY_DOWN, ord("j")):
+                    cursor = (cursor + 1) % len(items)
+                elif key == ord(" "):
+                    chosen.symmetric_difference_update({cursor})
+                elif key in (curses.KEY_ENTER, 10, 13):
+                    result_holder[0] = set(chosen)
+                    return
+                elif key in (27, ord("q")):
+                    result_holder[0] = cancel_returns
+                    return
+
+        curses.wrapper(_draw)
+        return result_holder[0] if result_holder[0] is not None else cancel_returns
+
+    except Exception:
+        return _numbered_fallback(title, items, selected, cancel_returns)
+
+
+def _numbered_fallback(
+    title: str,
+    items: List[str],
+    selected: Set[int],
+    cancel_returns: Set[int],
+) -> Set[int]:
+    """Text-based toggle fallback for terminals without curses."""
+    chosen = set(selected)
+    print(color(f"\n  {title}", Colors.YELLOW))
+    print(color("  Toggle by number, Enter to confirm.\n", Colors.DIM))
+
+    while True:
+        for i, label in enumerate(items):
+            marker = color("[✓]", Colors.GREEN) if i in chosen else "[ ]"
+            print(f"  {marker} {i + 1:>2}. {label}")
+        print()
+        try:
+            val = input(color("  Toggle # (or Enter to confirm): ", Colors.DIM)).strip()
+            if not val:
+                break
+            idx = int(val) - 1
+            if 0 <= idx < len(items):
+                chosen.symmetric_difference_update({idx})
+        except (ValueError, KeyboardInterrupt, EOFError):
+            return cancel_returns
+        print()
+
+    return chosen