feat(cli): split cloud render --resolution into --aspect-ratio + --resolution (#1143)

Aligns the `hyperframes cloud render` CLI with the v3 API's decomposed
shape (ef#38182). Replaces the flat 6-value `--resolution` flag with two
independent flags:

- `--resolution`: tier ∈ {1080p, 4k}; default 1080p; 4k bills at 1.5x
- `--aspect-ratio`: ratio ∈ {16:9, 9:16, 1:1}; default 16:9

Regenerates `packages/cli/src/cloud/_gen/{types,client}.ts` from the
updated `experiment-framework/openapi/external-api.json`. Threads
`aspectRatio` through `SubmitOptions` and `buildRenderBody` so it lands
in the request body as `aspect_ratio`.

Old flag values (`landscape`, `portrait-4k`, etc.) now reject at the CLI
layer via `parseEnumFlag`, matching the API surface's rejection. The
six legacy combinations map to the same effective output in the new
shape — see the migration table in ef#38182's PR body.

Deferred (will follow in a separate PR): 720p, 4:5, 5:4, and `auto`.
These need producer-side capability + controller-side composition-dim
inference; out of scope for an API/CLI shape refactor.