contract: the unit create, configurator cap and millwork 404 match the code

[futurebuildai]

Contract and comment text that disagreed with the code. No wire change: every response the server gives is unchanged; the contract now describes it.

Where	Was	The code
units.yaml UnitCreate	required: [code, name], "the dimension defaults to count"	unit/input.go refuses a create without dimension ("is required"), so it joins required
configurator.yaml validate and build-sku	"The body is capped at 64 KiB"	no module cap: httpx.DecodeJSON maps the platform's MaxRequestSize(10 << 20) (app/serve/chain.go) to a 413, already listed
millwork.yaml millworkGetOption 404	AppDisabled only	millwork/service.go answers httpx.NotFound for an unknown id; the 404 is now oneOf AppsDisabledError and WireError (disjoint: app_disabled only, and meta required)
worker.go package comment	three jobs	six, as Run logs: idempotency purge, outbox drain, outbox purge, draft events purge, order allocation, order fulfilment
exposure_scheduler.go comment	the recovery path for the at-most-once in-process bus	exposure notifications travel over the outbox, delivered at least once by the worker's drain

openapi.yaml (go run ./api/tools/merge) and web/packages/api-client/src/schema.d.ts (npm run generate) are regenerated. Gates run locally: merge -check fresh (406 operations), pending fresh (0 pending), go test ./internal/apicontract/... ok, conformance 1289 golden steps validated, npm run drift and npm run typecheck ok, go build ./..., go vet and gofmt on both packages clean, bash scripts/check-shape.sh OK. No frontend code builds a unit create body.

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