fix(setup): accept --host cursor and --host slate (#2361)

[gregario]

Summary

Fixes #2361 — ./setup --host cursor and ./setup --host slate exit with "Unknown --host value" even though both hosts have full configs in hosts/cursor.ts and hosts/slate.ts and are registered in ALL_HOST_CONFIGS.

The case statement at setup line 104 listed only claude|codex|kiro|factory|opencode|auto as pass-through hosts. Cursor and Slate are local IDE hosts with the same installation pattern (directory-based skill discovery) but were never added to the allowlist. The fix adds them alongside the other local hosts.

Verification

• bun test test/setup-host-validation.test.ts green (3/3)
• Regression tests fail on main:
  • "--host cursor is accepted" → fails because stderr contains "Unknown --host value"
  • "--host slate is accepted" → same

  Expected to not contain: "Unknown --host value"
  Received: "Unknown --host value: cursor (...)"
  

• Both pass after fix applied
• Discrimination verified: reverting only setup causes both failures

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

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[garrytan]

Closing: this was absorbed or superseded on main by v1.67.0.0 or earlier (see the v1.67 tracker-wave receipts in PR #2604). Thank you!