Codex P1: the runtime store added frequencyPenalty, seed, stop,
serviceTier, parallelToolCalls but the save/load path went through
sanitizeInferenceParams, which only whitelisted the older numeric set
plus systemPrompt / trustRemoteCode. The new keys were silently
stripped on save and dropped on reload.
Extend the whitelist:
- frequencyPenalty added to the numeric finite-number set.
- seed: integer or explicit null (null = "no seed field on the wire").
- stop: string array, capped at 4 entries per OpenAI's limit.
- serviceTier: nullable enum (auto/default/flex/priority/scale).
- parallelToolCalls: boolean.
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