Code-quality reviewer flagged a stale 'try/catch' phrase in the jsdoc
that didn't match the actual result.ok inspection pattern. Updated
description to accurately describe how tRPC v11 middleware sees errors
(returned result, not thrown exception) and how the middleware
discriminates and rethrows.
Pure docstring change — no behavioral or signature impact.
Factory takes [[ErrorCtor, TRPC_CODE], ...] tuples and returns a tRPC
middleware that translates matching domain errors to TRPCError. Discrim-
inates by instanceof; preserves original error as cause; unmapped
errors propagate (tRPC then wraps them as INTERNAL_SERVER_ERROR with
the original error as .cause — middleware does not interfere).
core-shared never enumerates feature errors — each feature passes its
own constructors in via integrations/api/procedures.ts (Tasks 3-7).
Also exports the `t` instance from trpc/init.ts so feature procedure
files can do t.procedure.use(...).
Also fixes tsconfig.json: rootDir set to "." and @/* path alias added
so test files using @/ resolve correctly under tsc --noEmit.
Refactor log: §1, §2, §4
Spec: R13–R17
