Release Notes — Starship Build Engineering System

v1.0.0 (June 25, 2026)

Initial delivery. A dependency-free build-engineering decision system for Starship Ship vehicle assembly.

Added

• Lean engine (src/lean.mjs): takt time, Ranked-Positional-Weight line

balancing, line efficiency / balance delay / smoothness index, throughput, parallel-station sizing, precedence validation.

• Schedule engine (src/schedule.mjs): Critical Path Method with full

forward/backward pass, slack, and critical-path recovery.

• Quality engine (src/quality.mjs): Cp, Cpk, expected PPM, sigma level,

with an Abramowitz-&-Stegun normal CDF.

• Tolerance engine (src/tolerance.mjs): 1-D worst-case + RSS stack-up with

fit checking.

• DFM engine (src/dfm.mjs): Boothroyd-style DFA design efficiency +

part-count / assembly-time reduction.

• Vehicle model (src/vehicle.mjs): notional IPV, PEZ, Raceway, Tank

Cleaning, and Megabay 2 Stacking scope.

• CLI (run.mjs) and live Build Line Planner (public/tool.html).
• Verification (verify.mjs): 18 hand-checkable checks + synthetic

benchmark.

• Full IRS_AUDITOR proof/ package.

Known limitations (see proof/LIMITATIONS.md)

• Vehicle data is notional (disclosed seam); no hardware built or measured.
• 1-D tolerance only; capability assumes normality; RPW is near-optimal.