subagenttasks

Flywheel: replicate the /mcp endpoint + server card fleet-wide

DONE 2026-07-02: workers/_shared/kit/mcp.ts factors subagentapi.com's Fable-5-reviewed handler (notifications→202, in-protocol errors over HTTP 200, parse-error id:null, GET→405, CORS, isError only for recognized-tool runtime failures) into a reusable handleMcp factory. Wired into all 24 D1 primitives (3 parallel lanes, sequential deploy+curl-verify per site — every site handshake-verified: initialize, notification 202, tools/call returning real rows). subagentapi.com catalog now advertises POST /mcp on all 24 entries and server-card describedby on 25 linkset entries (version 5d0fb34d). scripts/flywheel-metrics.sh measures 25/50 live MCP endpoints, up from 1/50 baseline.