remote-control silently fails when DISABLE_TELEMETRY is set to 0 or 1

Bug

/remote-control (and claude --remote-control) silently fails to activate when DISABLE_TELEMETRY is set in settings.json. No error message is shown — the command simply does nothing.

Steps to Reproduce

1. Add "DISABLE_TELEMETRY": "1" to env in ~/.claude/settings.json
2. Restart Claude Code
3. Run /remote-control or /rc

Expected: Error message explaining that Remote Control requires telemetry to be enabled
Actual: "Unknown skill: remote-control" — the slash command doesn't register at all

Additional Context

• Claude Code version: 2.1.84
• Platform: WSL2 (Linux 6.6.87.2-microsoft-standard-WSL2)
• Setting DISABLE_TELEMETRY to "0" still breaks it (non-empty string is truthy) — the key must be removed entirely or set to ""
• Debug logs confirm: isTelemetryEnabled=false (CLAUDE_CODE_ENABLE_TELEMETRY=undefined)

Suggested Fix

1. Show a clear error when /remote-control in Claude Code, or "claude --remote-control" is used with telemetry disabled (e.g., "Remote Control requires telemetry to be enabled")
2. Treat "0" / "false" as falsy for DISABLE_TELEMETRY