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PR #316 review blockers. A cursor fallback (clear-cell, yank, paste, drill-into-cell) now answers only for coordinates that were omitted, so `:clear-cell Type/Clothing Month/Feb junk` is refused instead of clearing the cursor's cell. The unknown-name checks move from `execute` to a RequireKnown effect run at apply time, so `:create-view Second . switch-view Second` is accepted as `improvise cmd` accepts it. Also pins that a quoted `.` is an argument. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze