docs: record x402 minimum dark deployment

[halfaipg]

Result

• Core f72ea93 / Alembic 0046 deployed at 2026-10-16 02:43:10 UTC; eight workers and all models recovered.
• Exact tested-tree identity, production backup/restore, drain, six-process config verification and independent postflight passed.
• x402 remains disabled; ordinary prepaid pricing, active NVFP4 admission, payout timers and historical payment fields are unchanged.
• No paid canary or payment was sent by this deployment. Fresh bounded payment/replay qualification remains required.

Evidence

• Record actual immutable/main source identity, backup checksum/size, rollback boundary and successful public/auth checks.
• Preserve concurrent video-rollout baseline interruption and source-bundle staging failures honestly.
• Update owning DOX and funding architecture without rewriting historical canary outcomes.

Verification

• git diff --cached --check passed.
• gitleaks staged scan passed.
• Docs only; exact runtime is already deployed under PR231.