docs: add enable/disable for installed skills

sdk/guides/skill.mdx

@@ -106,10 +106,14 @@ Add `triggers` to a SKILL.md for **both** progressive disclosure AND automatic i
 
 You can install AgentSkills into a persistent directory and list/update them
 using `openhands.sdk.skills`. Skills are stored under
-`~/.openhands/skills/installed/` with a `.installed.json` metadata file.
+`~/.openhands/skills/installed/` with a `.installed.json` metadata file that
+records an `enabled` flag. `list_installed_skills` returns all installed skills,
+while `load_installed_skills` returns only those with `enabled=true`.
 
 ```python icon="python"
 from openhands.sdk.skills import (
+    disable_skill,
+    enable_skill,
     install_skill,
     list_installed_skills,
     load_installed_skills,
@@ -125,9 +129,17 @@ print(f"Installed {info.name} from {info.source}")
 for skill_info in list_installed_skills():
     print(f"{skill_info.name}: {skill_info.description}")
 
-# Load installed skills for an AgentContext
+# Enable/disable controls which skills load (state persisted in .installed.json)
+
+# Disable a skill temporarily (e.g., while debugging or if it conflicts)
+disable_skill("my-skill")
+
+# Load installed skills for an AgentContext (only enabled skills load)
 skills = load_installed_skills()
 
+# Re-enable when needed
+# enable_skill("my-skill")
+
 # Update or uninstall
 update_skill("my-skill")
 uninstall_skill("my-skill")