A NaN corner load compares false to every rating, so a diverged corner
held forever while NaN spread node-to-node — watchDivergence only ever
guarded the tests. Non-finite load now breaks the corner instantly with
reason:'divergence', load zeroed for the HUD.
The pond per-node cap only ran on the rain-add: once rain stopped,
consolidation could stack a basin node past POND_MAX_KG_M2 unbounded.
Clamp moved post-flow, every step. Also fixes the dumpPond assert that
compared dumped to itself through a helper that returned its argument.
All three mutation-checked red before landing green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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