Brummel
a31d91453c
The cycle-0015 E2E guard param_space_mirrors_compiled_flat_node_param_order pins the load-bearing C23/#31 invariant — Blueprint::param_space() slot order mirrors compile()'s flat-node param order kind-by-slot — but only on the single-level composite_sma_cross_harness. collect_params (blueprint.rs:217) duplicates lower_items' depth-first traversal rather than sharing it (kept a parallel read-only projection so compile/inline_composite stay untouched and the compilat bit-identical, C9/C23), so the two orders must stay in lockstep forever. No mirror test ever compiled a composite-inside-a-composite: a future inliner reorder that desynced the projections only under nesting could pass the single-level mirror and the isolated nested param_space order test, yet break the slot-by-slot premise #31's binding rests on. Adds param_space_mirrors_compiled_flat_node_param_order_under_nesting: compiles a strategy -> { fast_slow -> [Sma, Sma, Sub], LinComb } nest and asserts param_space() equals the compiled flat-node param order kind-by-slot, pinning the concrete [I64, I64, F64, F64] shape. Green immediately — coverage-hardening, no desync in the current tree. Test-only; collect_params/lower_items/compile untouched. Verified: cargo test -p aura-engine green (55 tests), clippy --all-targets -D warnings clean. closes #34