The standalone worker entry gets the watchdogs, and can finally build

[ralyodio]

apps/worker/src/main.js is the entry for splitting workers onto their own service. It had
no watchdog, because the one added in #79 went into the combined entry next door and #80
moved that to the package.

Why the worker is the case that most needs it

A worker has less to show for a wedge than a web process, not more. There is no page to
hang, so a worker stuck on a client simply stops doing the work and nothing anywhere goes
red. This entry answers no requests at all, so there is not even a slow page for somebody to
notice. The three outages behind all of this were only caught because a human loaded the
site.

const watchdogs = watchDependencies({
  postgres: () => healthcheck(),
  redis: () => connection.ping(),
});

Same two probes, same shared sql handle and shared connection, same package, same
timings. stop() runs first on SIGTERM so a clean drain is not read as a wedge.

It has never been able to build

Found while wiring it. This file imports configurePayments from @tipoff/payments, and
apps/worker/package.json does not declare it:

$ bun build apps/worker/src/main.js --target=bun
error: Could not resolve: "@tipoff/payments"

That reproduces on unmodified origin/main, so it is pre-existing and not from this change
(verified by stashing this diff and rebuilding). The comment at the top of the file promises
that splitting the workers off is a Railway variable change and a different start command
"with no code to rewrite" — in fact it would have failed at import.

One line added to apps/worker/package.json, and the entry builds for the first time
(2.15 MB bundle). Nothing deployed runs this entry today: the live services run
apps/web/src/main.js with ROLES, so this is a latent defect rather than an outage.

Testing

bun build apps/worker/src/main.js now resolves and bundles. biome check clean. 25 pass /
0 fail on config and nichedb-plays. The package itself carries the watchdog's own 19 tests.

Same change is going to genrewatch and watchnews; genrewatch already declares its payments
package, so only the watchdog part applies there.

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