0.11.1: repair invalid sunset/sunrise time conditions

Fixes drafts that failed with 'Invalid time specified: sunset'. The model was emitting a redundant, invalid time condition using sunset/sunrise alongside the correct sun.sun night check. Helmsman now repairs that deterministically before validation (converting a night/day sun-word pair to a sun.sun state condition, or dropping an invalid sun-word bound while keeping a real clock time), and the author prompt gained a worked example plus explicit rules against the pattern. Requires 0.11.0's fidelity gate.