SvelteKit's production build forbids non-handler exports from a
+server.ts file — dev runs them fine but `pnpm build` errored with
"Invalid export 'coerce' in /api/v1/voice/parse-task" when trying to
deploy mana-web with the new unit tests.
Move ParseResult, fallback, DATE_TRIGGER_PATTERNS,
PRIORITY_TRIGGER_PATTERNS, transcriptMentions, coerce, and extractJson
into a sibling coerce.ts module. The +server.ts file imports from
there and only exports POST, which is the prod build's hard rule.
Tests now import from ./coerce instead of from the route handler,
which also drops the $env/dynamic/private resolution dance from the
test fast path — coerce.test.ts now runs in ~130ms instead of ~400ms
because it pulls in zero SvelteKit runtime.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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