PR #153 review (Hoshe H1): zone_type/era/floors/flavor all shared one fp_chain
and each took splitmix64(seed) of the same value, correlating the fields (era
tracking floor height across a city). Derive a distinct sub-chain per field so
they draw independent entropy. Block_tags aren't serialized, so no fixture
change; behavior stays deterministic.
Also (review): n=1 corridor test (empty, no panic), Frontier-density waterfront
test, and a comment on the reserved `_morphology` param (Tyre).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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