Evaluate provider readiness and optionally publish a hosted listing

Operator-only activation bridge using the same activation outcome contract as the owner route. With publish_listing=true, publication occurs only after fulfillment review, smoke, and intent reconciliation pass and the provider reports the exact ready service/trust/public- HTTPS contract. Supported pricing plus the immutable paid floor are enforced. Runtime activation may be successful while a new/content-changed listing remains active/pending in semantic owner review before sandbox queueing, or while an unchanged approved listing's sandbox proof is queued, pending, or in sanitized queue error. The listing stays non- invokable, x402 compatibility invoke metadata remains null with x402_listing_pending or x402_listing_blocked, and canonical read-time hydration controls effective exposure. Non-ready providers return HTTP 202 with success=false, activated=false, readiness details, and no listing. Existing listing rows must remain seller-owned, hosted/platform-hosted, exact active/approved, and revision- unchanged; otherwise their current state is preserved and the same negative shape returns at HTTP 409. Admin hosting never autoapproves or silently resumes those rows. Persisted listing economics are checked before the activation provider effect; an omitted activation price defaults to exact zero, while malformed/conflicting/below-floor values return a typed 400.