skmtc / skmtc-generators

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fix(gen-tanstack-query-fetch-zod): pass variables into mutationFn (#11)

The generated mutation hook's `mutationFn` was emitted as `async () => {…}`
with no parameters, yet its body references `body` (and path params via
the URL template). React Query passes the mutation variables to
`mutationFn` at call time, so the function must declare that parameter —
unlike the query hooks, where the enclosing hook destructures the args and
the `queryFn` closes over them. The already-constructed `this.parameter`
(a destructured, typed FunctionParameter) was never emitted into the
signature, so every generated mutation hook failed to compile with
TS2304: Cannot find name 'body'.

Emit `this.parameter` into the arrow signature, mirroring how
QueryEndpoint emits `this.queryFn.parameter` for the query hooks.

Verified end-to-end via core `toArtifacts` against a petstore doc:
- body only  → `async ({body}: UseCreateApiPetArgs) => {…}`
- body+path  → `async ({petId, body}: UseCreateApiPetPetIdArgs) => {…}`
Extracted output type-checks with no TS2304. Version bumped 0.2.4 -> 0.2.5
so the cascade republishes.

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