Every capability is pinned to a file.
These are the committed conformance fixtures: the same requests the cross-language gate replays on every engine, on every change.
Fixtures with a page of their own
Exact fit
Identical cubes filling a container exactly, with no rule in play. The baseline every engine must agree on before anything harder is meaningful.
Mixed units in one request
One item measured in inches beside siblings in millimetres, both restricted to a single orientation. The conversion is exact, with no tolerance to tune.
Compound obstacle
A non-rectangular exclusion zone built from the union of exact boxes: a wheel arch, or a roof shelf that placements have to route around.
Minimum support ratio
Support measured against the exact supporting footprint area, so a box that merely fits above a gap is rejected rather than reported as packed.
Cumulative top load
A bearing limit checked against the weight of the whole stack above an item, not only its direct neighbour.
Group atomicity
A two-item group that cannot travel together is rejected as a whole, and the unrelated items in the same order are not stranded with it.
Forbidden orientation
A keep-upright item that would have fitted lying down. The refusal names the rule: rotation_restricted, proven.
Delivery sequence
Two stop-indexed items in a container exactly as tall as one of them: an item due at a later stop must never be buried under an earlier one.
Two-axle statics
Gross two-axle reactions include tare and payload and stay inside both exact limits, so the load is weighed where it actually rests.
Interlocking nesting
Identical items interlock by exactly their nesting height, and the effective volume follows the interlocked shape rather than the sum of the parts.
Cheapest eligible container
The lowest_cost objective picks the cheaper of two otherwise equivalent containers, or the engine rejects the objective explicitly.
Versioned policy rules
Segregation, routing and per-facility rules compiled into the search, so an excluded item returns policy_rule with the rule id and version.