- Drop `scale` from the OpenAI service-tier picker (frontend types and
picker option list). OpenAI in Studio routes through `/v1/responses`,
which does not accept `scale`; offering it in the UI silently
dropped the value at the backend and misled users into thinking
their selection was applied. Backend Literal still accepts it on
input so stale clients are not 422'd, and `_stream_openai_responses`
continues to drop it from the wire body.
- Dedupe + drop empty entries for OpenAI Chat `stop` and Anthropic
`stop_sequences` before forwarding so whitespace chips or accidental
repeats do not waste the 4-entry OpenAI cap or the 16-entry
Anthropic cap. Anthropic over-cap now logs and truncates, matching
the OpenAI path.
- Static `aria-label="Parallel tool calls"` on the Switch; screen
readers already announce checked / unchecked state, so the dynamic
Enable/Disable label was redundant.
- Forward an `aria-label` onto the inner Input inside
`StopSequencesInput` so screen-reader users can identify the field.
- Regression tests covering the new dedup, truncation, and the
preserved silent-drop of `scale` on Responses.
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