docs/archive/PIVOT_P1_ROTATING_ELLIPSE.md

Pivot: P1 Rotating-Ellipse Environment

Date: March 7, 2026 Role: Short decision record Status: Not an active SSOT surface

Decision

Pivot the environment to the official P1 benchmark with real constellaration physics and a repaired low-dimensional boundary family derived from a rotating-ellipse seed.

Why

• the historical upstream 3-knob family could not satisfy the P1 triangularity requirement
• the repaired 4-knob family restored a meaningful low-dimensional control surface
• the hackathon artifact needs a narrow, legible, human-playable environment rather than a transplanted optimization harness

What This Does Not Mean

• it does not make the low-dimensional family the full P1 design space
• it does not justify porting the old ai-sci-feasible-designs harness
• it does not settle repaired-family ranges, deltas, or budget choices without measurement

Where The Live Truth Now Lives

• planning and execution: ../FUSION_DESIGN_LAB_PLAN_V2.md
• technical contract: ../P1_ENV_CONTRACT_V1.md
• blocker and sweep evidence: ../P1_PARAMETERIZATION_DEEPDIVE.md