Guard becomes land_districts <= 1 (both reviewers converged — a lone
island definitionally cannot show two distinct directions; same
nothing-to-vary condition one value short), with a lone-island vacuous-
pass fixture; golden confirmed untouched. Oasis scaling adjudicated as
LIVE, not future — GRID_W is already 1024 on main, so ring iterations
change 2/4 -> 4/8 today: extracted a pure oasis_ring_iterations()
helper pinned by tests at both 512 and 1024, and traced exactly why the
determinism hash stayed green (it reads only elevation; the rings touch
only biome — a genuinely different array, not a coincidence). The
drainage merge-logic question answered byte-precisely: zero logic
changed vs main (comment-only diff) — and the deeper dig PROVED the
'isolated basin with another basin to escape to' branch is
mathematically unreachable for any connected grid (contracting vertex
groups of a connected graph cannot disconnect it), so the comment now
states that instead of narrating a divergence that never fires; two
direct merge-target tests added regardless. Wrap test renamed to what
it actually pins (non-wrap-awareness). D-010 docstring softened to
same-process purity, naming the cascade golden as the cross-run layer.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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