[CLI] Feature Request: Support /skill lifecycle commands for installed AgentSkills

[enyst]

Summary

Audit result from AGE-850: the CLI currently exposes /skills for viewing loaded resources, but it does not yet expose a dedicated /skill command surface for managing installed AgentSkills.

The SDK now has a public lifecycle API that is suitable for CLI integration:

• install_skill()
• list_installed_skills()
• load_installed_skills()
• enable_skill()
• disable_skill()
• uninstall_skill()
• update_skill()

These are exposed from openhands.sdk.skills and demonstrated by runnable examples in:

• examples/05_skills_and_plugins/04_skill_enable_disable/main.py
• examples/05_skills_and_plugins/05_skill_uninstall/main.py

Current gap

openhands_cli/tui/core/commands.py currently lists /skills for inspection, but there is no /skill lifecycle command family for install/enable/disable/uninstall flows.

/plugin command tracking already exists in APP-858. This issue tracks the missing skill-side command surface separately so the CLI can expose the two command families cleanly:

• /plugin ...
• /skill ...

Proposed command surface

• /skill install <source>
• /skill list
• /skill enable <name>
• /skill disable <name>
• /skill uninstall <name>
• /skill update <name>

Acceptance criteria

• A user can install an AgentSkill from the CLI via the SDK public API.
• A user can list installed skills and see enabled/disabled state.
• A user can disable a skill and confirm it is excluded from the loaded installed skills set.
• A user can re-enable the same skill without reinstalling it.
• A user can uninstall a skill and confirm its install directory + metadata entry are removed.
• Command UX stays clearly separated from /plugin management.

[sjathin]

@enyst Please check out PR #680

[github-actions]

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