server/src/mock/index.ts was 1,545 lines, the largest file in the repo.
It had carried `/* ---------- data ---------- */` style markers for a
while, so the seams were already drawn; this turns six of them into
files.
mock/config.ts 51 env-derived constants, `account`, `state`
mock/data.ts 410 fixtures and the builders that make them
mock/engine.ts 442 the generic JMAP machinery -- get/set, filters,
patches, refs, limits, recurrence plumbing
mock/handlers.ts 455 the `Method/name` dispatch table
mock/events.ts 26 SSE fan-out and the Email/changes ring buffer
mock/auth.ts 11 checkOtp
mock/index.ts 195 HTTP routing, the session document, listen
TWO THINGS THAT COULD NOT JUST MOVE:
`counter` and `vacation` were module-level `let`s written from both the
fixture builders and the handlers. An ES module can export a `let` and
importers see it update, but they cannot assign to it, so both became
containers: `seq.counter` and `vacationBox.current`. Seven call sites.
`recordEmailChange`, `broadcast`, `sseClients` and `checkOtp` lived in
the HTTP section, but the handlers call them -- and index.ts imports the
handlers. Leaving them there is a cycle, so they became events.ts and
auth.ts rather than being dragged into data.ts, which is fixtures.
`account` is still exported from index.ts, because account.test.ts and
login-guard.test.ts reach for `mock.account` and `mock.server`.
Verified by running it, not only by compiling it: `npm run mock` boots
and listens, `/.well-known/jmap` returns a session, and a POST to
`/jmap/` answers Mailbox/get with the nine seeded folders and
Email/query with the seeded messages.
