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TREK/server
Maurice 7dea88120b docs(server): bring the nest README up to the foundation work (#1830)
The README is the binding spec, and seven PRs have landed patterns it does not
mention. Someone reading it today would rebuild things that now exist, and would
walk into two traps that cost real time this week.

Added to the foundation section: common/ and why those helpers are free
functions, auth/jwt-verify.ts and why JWT_SECRET must not move to app-config,
query-helpers/, trip-membership/ and the cycle that put it in its own module,
AddonGuard + @RequireAddon with its ordering requirement, and demo-write.

New subsection on reaching the container from outside it. The choice is settled
now: hand the dependency in, declared structurally, the way index.ts fills the
scheduler's SchedulerDeps. Bridges stay correct for the MCP registrars, but the
README should say what they cost — a bridge rebuilds its services with `new`, so
one added constructor parameter meant editing five bridge files in a single PR.

Two gotchas that are cheap to read and expensive to rediscover:

  Never gate a multipart upload with a guard. Guards run before the parser, so
  throwing leaves the body unread and Node resets the connection — the client
  gets ECONNRESET rather than the 403.

  @Global only applies to modules that are in the graph. An e2e TestingModule
  built around one domain module does not get AppConfigModule for free, and a
  provider injecting RuntimeEnvService takes every suite importing that module
  down with it.

Also corrects an assumption the migration plan makes and this README implied:
the trip-access and canEdit methods on the domain services are not dead weight
waiting for TripAccessGuard. Across the five domains piloted for it, 40 of the
46 callers are *.mcp.ts tools, which never pass through an HTTP guard. Only 6
sit in controllers. Counted, not estimated.
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