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rev 3 of the curve redesign. The developer's verdict on the 01 baseline was that the LOWLANDS ARE GOOD; the fault is the terracing above them. So this adds a second curve mode that preserves the low plain bit-for-bit and replaces everything above the flood line with one smooth monotone climb. Core/ContinuousCurve — piecewise, and the pieces have different loyalties: - at/below sea: identity, as ever. - above sea to K2: DELEGATES to HeightCurve's own toe+red branches. Not "equivalent" — the same code path, so the same floats. Oracle (d) holds it to that. - above the ceiling: a Fritsch-Carlson (PCHIP) monotone spline to the 420 m cap, C1-joined to the red band's exit slope. Monotone by construction for any ordered control points, which retires the 24-corner sweep; a 10k strict-increase sample runs per seed anyway, because "cannot fail" is worth a millisecond. - Build() REFUSES rather than degrades: a ceiling near the old bench, a drama that folds the summit under its own onset, control-point secants that are not strictly increasing (the no-magnet rule, enforced rather than hoped for). Only BENCH_*/PLATEAU_* are dropped. SEA/ORANGE_CEIL/RED_CEIL survive because they are the storm-ladder FLOOD TIERS and they live inside the preserved lowland; PEAK_CAP and the per-seed spikeMax normalization survive as the summit. Shelf detail is forced off in continuous mode: the flat benches it de-slabbed no longer exist, and painting noise on the climb now would pre-judge what erosion should carve. Oracle, all hard checks passing: - (a1) curve off is bit-identical to Phase 1's dump. - (a2) staircase mode is bit-identical to TASK 01's dump — the control is provably the control, not a re-derivation. (CurveBaselineTool is pinned to Staircase so the config default moving to Continuous cannot drift it.) - (d) lowlands bit-identical to the staircase over 3.6M cells, every continuous variant, both seeds. The lifted_WRONG bookend fails it on 1.6M cells, as intended. - (f) sea identity per CELL, not per count, including 67M cells at 8192. The finding, measured and recorded in the batch scratch: the massif SHRANK. Land above 100 m goes 14.9% -> 4.8%, above 220 m 4.5% -> 0.6%. A feather sweep to the practical floor recovers ~1.3 points, so this is structural, not a tuning miss: the staircase's highland area was an artifact of the bench and plateau acting as magnets, and a curve with no magnets preserves the raw distribution's bottom-heavy shape. "No terraces" and "the same land up high" are not both available from curve work alone. Exploration batch, not convergence. A tuning pass follows once a direction is picked. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCWNaDZPfTiAy3meGNGgqt
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