Adds the smallest DI surface to `initMollifierDrainerWorker` (`isEnabled`
and `getDrainer`, both optional, default to live env/singleton) so the
catch-block policy can be tested without manipulating module-level env:
- rethrows MollifierConfigurationError — deterministic misconfig
escapes, which is what makes the production-path crash on boot
(the call site in entry.server.tsx runs sync at module top level,
before `process.on("uncaughtException", ...)` is registered, so an
escape becomes a Node default-handler exit-1).
- rethrows when `name === "MollifierConfigurationError"` even when
`instanceof` fails — covers the Remix dev hot-reload realm edge
case where the catch holds a stale class reference.
- swallows non-configuration errors — a transient Redis blip during
buffer init shouldn't take the whole webapp down.
- no-op when disabled — the factory isn't invoked when the enabled
predicate returns false.
Also updates the existing mollifier server-changes note to: rename env
vars to TRIGGER_MOLLIFIER_* prefix, document the TRIGGER_MOLLIFIER_DRAINER_ENABLED
split for multi-replica drainer placement, and call out the new fail-loud
behaviour on drainer misconfiguration.
Dan Sutton
68ae8b0c19