nx_markets_member.nx

nx_markets_member.nx -- wire the MARKETS-INVESTING finance capabilities into the RACI + TEAM, SOVEREIGNLY (operator 2026-06-24: "make sure these things are wired into the raci and team"; "get us off tsv"). Mirrors nx_raci_bind's sovereign pattern: registers each capability as a row in the nx_role_store seg-store channel "finmkt" (NO TSV) -- id<TAB>label<TAB>activity<TAB>role<TAB>ownership -- where `activity` is the team's RACI work-type (research/build/verify/coordinate) and `role` is the role the RACI contract makes ACCOUNTABLE for that activity. GROUNDED, not asserted: it migrates the RACI contract into the sovereign store (raci_migrate) and VERIFIES each named role is really Accountable (raci_is_accountable) before trusting the binding -- a capability bound to a non-accountable role is flagged. IDEMPOTENT (skips an already-registered id). This is how the markets-investing arc stops being an orphan: the team roster + the RACI both know who owns it. Personal finance is already a member via nx_fin_member; this is its markets-investing sibling. license_tier: ORIGINAL