Liberty Bee V2 rc3 - the discount grid

rc2 + V00074 (seven discount-depth ladders as seeded data), corpus_diff/gen_runs_manifest/reach_probe published, RUNBOOK.md, V2 manifests. Seed: LibertyBeeGold_v0-6-1.bak, sha256 503eef4566de1a0329456912502740c0afe7e4914198eef121a86b74908bf26c (carries the chain through V00074; anchor validated to the penny).