magma-1518-obstruction-lean ports every Lean file to the module system for its third Palomar attempt

The second automated Palomar review found no mathematical blocking issue in the selected statements of magma-1518-obstruction-lean and one presentation problem: the README’s Palomar section still described the ten-declaration package, F5 and F13 members of Theorem F included, while the submitted Comparator configuration checks only the four Theorem A declarations — and still said nothing had been submitted. The README now separates what the configuration checks from what else the repository holds and how each part is checked, and PALOMAR.md splits its check record by package so the earlier ten-declaration runs, including the 33-theorem audit and the rc3 Comparator run made before the narrowing, are no longer read as evidence about the narrowed one (1794778).

The third submission attempt was stopped somewhere new: Palomar’s preliminary checks now require every .lean file in the repository to begin with the module header, and PalomarTemplate migrated to modules the same day. All sixteen files are now modules — definitions sit in @[expose] public section so their bodies stay visible to importers, imports become public import, and the bv_decide census files needed public meta import Std.Tactic.BVDecide.Reflect without which every census theorem would have quietly fallen back to sorryAx outside every library, which neither CI nor the axiom audit would have caught. Axiom footprints are unchanged file by file against the pre-port versions, and lake build, the 27-theorem axiom audit and Comparator with both kernels pass on the package (eb2bbde).