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docs: island falloff, coast shelf, offshore islets (terrain-water task 11)

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Tools/Scripts/README.md: the falloff dials and what they actually do --
including that IslandAxisX is a weak lever because the island is already
Trench-clamped at ~90% of the map width, so nobody re-derives that the hard
way. The spine crest fix, and an explicit note that the spine's AXIS is
still a straight line down the map centre: known, deferred, its own task.

BLUEPRINT_FORMAT.md config-knobs section: the three new dials, each labelled
with whether it moves biomes. CoastProfile does NOT (it cannot move the
waterline, so HGTS changes while BIOM/WBID/WBTB/WSRF stay bit-identical);
IslandAxis* and OffshoreIslandDensity DO, by design.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Stewart Howe 2026-08-08 23:31:40 -04:00
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14
Core/Scripts/BLUEPRINT_FORMAT.md
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@ -122,6 +122,20 @@ body).
follow the curved terrain. When on, `TCRV` records the effective parameters including the
per-seed `spikeMax`.
- **`CoastProfile`** (`"wide"` | `"steep"`, default `"wide"`) — the submarine shelf. The height
curve is identity at and below sea level, so it never reshaped the seabed; `"wide"` compresses
shallow depth so the shallows reach 2.4–2.9× further out. It is strictly positive for positive
depth and therefore **cannot move the waterline**, so `HGTS` changes while `BIOM`, `WBID`,
`WBTB` and `WSRF` stay bit-identical. `"steep"` is the pre-task-11 seabed.
- **`IslandAxisX`** / **`IslandAxisY`** (default `1.30` / `0.78`; pre-task-11 `1.15` / `0.90`) —
the falloff axis ratios, and the island's proportions. These **move the coastline**, so unlike
the curve and detail work they legitimately change `BIOM` and the water sections: an elongated
seed has a new biome baseline. Rejected (with a loud restore to legacy) if ≤ 0.01, which would
divide by ~zero and silently yield an all-ocean map.
- **`OffshoreIslandDensity`** (default `0.02`, `0` disables, clamped to 0.5) — the fraction of the
offshore noise field above the islet threshold, calibrated per seed against the field's own
distribution. Adds land, so it also moves `BIOM` and the water sections.
### Deliberately NOT a section: basins (`BSIN`)
The priority-flood pit-fill that runs in the water-bodies stage is **diagnostics only** and