nx_assign_gen.nx

nx_assign_gen.nx -- the RESEARCH -> SPEC -> ASSIGNMENTS pipeline (operator: "make sure our research goes to spec better to create assignments... the teams workflows getting to s class exceed"). Closes the link the team didn't own: turning the researcher's ADMITTED FACTS into the BACKLOG -- the part Claude used to write by hand. Each candidate work-item carries its evidence (corroboration count from the researcher), its charter layer, whether the action is known, and its dependency. The generator: * GROUNDS every BUILD assignment in >= 1 corroborated fact (the no-thin-air cardinal). A 0-evidence item is NOT fabricated into a build task -- it becomes a PURSUE (raised-hand research) assignment. * ORDERS by the charter ladder (ss_build_rank: hardware up, deps break ties). * Refuses an invalid plan: build-order must be MONOTONIC (no item depends on a later/higher one). The S-class gate = grounded + gap-flagged + order-monotonic. Composes nx_spec_layers (ss_status/ ss_build_rank/ss_count_gaps). LAWS: struct-free, integer-only. license_tier: ORIGINAL