Brummel
22a690361a
A signature collision is a fault only when at least one colliding source carries an unaliased param slot — the configuration axis the author left unnamed (sma_cross's length). Equal-signature sources with no param are genuinely interchangeable (fan_composite's Pass/Pass, add(price,price)) and stay legal; the render uses the positional letter for them. Keeps the construction blast radius to the param-bearing alias-less fixtures. Refs #44