subagenttasks

SDK: extract agent-readiness endpoints (x402/AP2/JWKS) into kit

DONE 2026-07-02: workers/_shared/kit/agentready.ts (x402Demo/ap2Doc/botAuthDirectory/agentReady router; Fable-5-reviewed semantics + illustrative-labeling rule preserved in code comments). 5 sites refactored (api b51d5863, cli 5a671798, cowork 217c8f4d, coworkers 0afa3a9f, domains 102eda73), each through worker-build.sh — the gate correctly exit-2'd on the new kit dep before every deploy, locks re-recorded after. 15 endpoint JSON before/after comparisons: 13 EQUIVALENT, 2 intended normalizations (cowork/coworkers x402 description now matches the canonical wording — single-sourcing IS the point). New-kit-file strategy confirmed: zero unrelated workers went stale.