Additive: seo stage writes _prab_* meta per the ratified prcore JSON-LD contract (emitter consumes); computes citation_score + configurable threshold (gate is P2b.4). Deterministic, no LLM/cost, live path untouched. Uninstall purges _prab_ meta. QA APPROVE 55b94d0; CI green (VPS-verified).
Agent-Session: prab-phase2b-3-merge
RunwareModelCatalogTest mocks time() via Patchwork/Brain\Monkey. Without
declaring it in redefinable-internals, Patchwork throws NotUserDefined
on every test in that suite (18 failures).