fix(cli): resolve duplicate 'skills' subparser crash on Python 3.11+

Fixes #898 — Python 3.11 changed argparse to raise an exception on
duplicate subparser names (CPython #94331). The 'skills' name was
registered twice: once for Skills Hub and once for skills config.

Changes:
- Remove duplicate 'skills' subparser registration
- Add 'config' as a sub-action under the existing 'hermes skills' command
- Route 'hermes skills config' to skills_config module
- Add regression test to catch future duplicates

Migration: 'hermes skills' (config) is now 'hermes skills config'

hermes_cli/main.py

@@ -2252,8 +2252,8 @@ For more help on a command:
     # =========================================================================
     skills_parser = subparsers.add_parser(
         "skills",
-        help="Skills Hub — search, install, and manage skills from online registries",
-        description="Search, install, inspect, audit, and manage skills from GitHub, ClawHub, and other registries."
+        help="Search, install, configure, and manage skills",
+        description="Search, install, inspect, audit, configure, and manage skills from GitHub, ClawHub, and other registries."
     )
     skills_subparsers = skills_parser.add_subparsers(dest="skills_action")
 
@@ -2307,9 +2307,17 @@ For more help on a command:
     tap_rm = tap_subparsers.add_parser("remove", help="Remove a tap")
     tap_rm.add_argument("name", help="Tap name to remove")
 
+    # config sub-action: interactive enable/disable
+    skills_subparsers.add_parser("config", help="Interactive skill configuration — enable/disable individual skills")
+
     def cmd_skills(args):
-        from hermes_cli.skills_hub import skills_command
-        skills_command(args)
+        # Route 'config' action to skills_config module
+        if getattr(args, 'skills_action', None) == 'config':
+            from hermes_cli.skills_config import skills_command as skills_config_command
+            skills_config_command(args)
+        else:
+            from hermes_cli.skills_hub import skills_command
+            skills_command(args)
 
     skills_parser.set_defaults(func=cmd_skills)
 
@@ -2332,19 +2340,6 @@ For more help on a command:
         tools_command(args)
 
     tools_parser.set_defaults(func=cmd_tools)
-
-    # =========================================================================
-    # skills command
-    # =========================================================================
-    skills_parser = subparsers.add_parser(
-        "skills",
-        help="Configure which skills are enabled",
-        description="Interactive skill configuration — enable/disable individual skills."
-    )
-    def cmd_skills(args):
-        from hermes_cli.skills_config import skills_command
-        skills_command(args)
-    skills_parser.set_defaults(func=cmd_skills)
     # =========================================================================
     # sessions command
     # =========================================================================

tests/hermes_cli/test_skills_subparser.py

@@ -0,0 +1,35 @@
+"""Test that skills subparser doesn't conflict (regression test for #898)."""
+
+import argparse
+
+
+def test_no_duplicate_skills_subparser():
+    """Ensure 'skills' subparser is only registered once to avoid Python 3.11+ crash.
+
+    Python 3.11 changed argparse to raise an exception on duplicate subparser
+    names instead of silently overwriting (see CPython #94331).
+
+    This test will fail with:
+        argparse.ArgumentError: argument command: conflicting subparser: skills
+
+    if the duplicate 'skills' registration is reintroduced.
+    """
+    # Force fresh import of the module where parser is constructed
+    # If there are duplicate 'skills' subparsers, this import will raise
+    # argparse.ArgumentError at module load time
+    import importlib
+    import sys
+
+    # Remove cached module if present
+    if 'hermes_cli.main' in sys.modules:
+        del sys.modules['hermes_cli.main']
+
+    try:
+        import hermes_cli.main  # noqa: F401
+    except argparse.ArgumentError as e:
+        if "conflicting subparser" in str(e):
+            raise AssertionError(
+                f"Duplicate subparser detected: {e}. "
+                "See issue #898 for details."
+            ) from e
+        raise