test(simulation): believability + budget verification harness (T-1031)
D-239 §1/§8/§9/§10 verification harness (server/tests/derivation_harness.rs): golden-seed determinism regression, §8 binding-law sweeps (drainage monotonicity, lithology->landform, glaciation->form no-glacial-U-at-grade-0, climate->vegetation no-skip + riparian), per-family <5ms/chunk budget assertion, and validation-case bodies (Kallast=alluvial pass; Velen/Gruenfeld skipped-not-in-wiki). Exposes derive_morphology_zone as pub for the integration test. NOTE: golden file not yet generated + fixtures predate the T-1033 BodyParams strip; fixed in follow-up commits after merging main. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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