[BUG] /remote-control in-session command returns 'Unknown skill' (was working previously)

Description

The /remote-control (and /rc) slash command inside an active Claude Code session returns Unknown skill: remote-control instead of starting a Remote Control session. This command was working as recently as yesterday (2026-02-26).

Expected behavior

Per official documentation, /remote-control inside an existing session should start a Remote Control session and display a session URL + QR code.

Actual behavior

Returns Unknown skill: remote-control — the command is being routed to the skill/plugin system instead of being handled as a built-in CLI command.

Steps to reproduce

1. Start a Claude Code session: claude
2. Type /remote-control or /rc in the session
3. Observe "Unknown skill: remote-control" error

Environment

• Claude Code version: 2.1.62
• OS: Windows 11 Pro 10.0.26200
• Plan: Max subscription
• Plugins: oh-my-claudecode 3.9.8 (may be intercepting slash commands)

Additional context

• claude remote-control as a CLI subcommand (outside session) is not affected
• The in-session /remote-control command was functional on 2026-02-26
• Possibly related to #28773 (similar symptom but different error message)
• May be a regression in 2.1.62 or a server-side feature flag change