nx_srcreach_gate.nx

nx_srcreach_gate.nx -- THE GATE FOR THE SOURCE REGISTRY READER AND THE PACE BUDGET (/compare/researchreach RR1, RR3). IN-PROCESS ON PURPOSE. It imports nx_srcreg_lib and calls sr_classify and sr_pace directly rather than forking a deployed elf, for three reasons: it is deterministic (no network, no host in the loop, so it cannot flake), it is fast enough to sit on a roster, and it is MUTATION-SENSITIVE -- a change to the classifier or the budget arithmetic shows up here immediately, which is what makes nx_gate_bite able to say anything about it at all. WHY THIS GATE EXISTS: nx_srcreach decides which of the estate's declared research sources are usable and how many outbound requests a sweep may spend. A reader that silently drops a row it cannot parse under-reports coverage in the FLATTERING direction, and a budget that understates its cost is how an array gets hammered. Both failures are quiet, so both need a gate that fires rather than a habit that remembers. EVERY BAD CLASS IS PLANTED AND EVERY PLANT MUST BE CAUGHT, and the POSITIVE CONTROL is the half that matters most: a clean registry must read entirely OK. A classifier that refused everything would pass every planted-defect tooth while being useless, so the clean-reads-clean teeth are what separate a working ruler from a broken one. THE BUDGET IS ASSERTED AGAINST HAND-COMPUTED VALUES with gv_check_eq, so the number tested and the number printed are the same expression and cannot drift apart. Fixtures are assembled at RUNTIME in this gate's own /tmp directory, never shared with a production beat. license_tier: ORIGINAL No hw writes (Rule 26).