feat(skills): show enabled/disabled status in 'skills list' (#16129)

'hermes skills list' now shows every skill's enabled/disabled status
and accepts --enabled-only to filter down to what will actually load
for the active profile:

    hermes -p dario skills list --enabled-only

Previously the command was a flat catalog — it did not apply
skills.disabled from config.yaml, so there was no way to see the
live skill set for a profile without reading config by hand.
Profile switching already works via -p (swaps HERMES_HOME); this
just surfaces the result visibly.

Changes:
- hermes_cli/skills_hub.py: do_list adds a Status column and an
  enabled_only filter; summary reports enabled/disabled split
- hermes_cli/main.py: --enabled-only flag on 'skills list'
- /skills list slash command accepts --enabled-only too
- tests: 4 new (status column, disabled marking, enabled-only
  hiding, no platform leakage into get_disabled_skill_names);
  existing fixtures updated to accept skip_disabled kwarg

Reported by @mochizukimr on X.

hermes_cli/main.py

@@ -8453,6 +8453,12 @@ Examples:
     skills_list.add_argument(
         "--source", default="all", choices=["all", "hub", "builtin", "local"]
     )
+    skills_list.add_argument(
+        "--enabled-only",
+        action="store_true",
+        help="Hide disabled skills. Use with -p <profile> to see exactly "
+             "which skills will load for that profile.",
+    )
 
     skills_check = skills_subparsers.add_parser(
         "check", help="Check installed hub skills for updates"