feat: add gpt-5.3-codex-spark model to openai codex provider

[roomote]

Adds the gpt-5.3-codex-spark model to the OpenAI Codex (ChatGPT) provider. This is a fast, lightweight coding model variant available via ChatGPT subscription.

Changes

• Added gpt-5.3-codex-spark model definition to packages/types/src/providers/openai-codex.ts with appropriate capabilities (apply_patch tooling, prompt cache support, reasoning effort levels low/medium/high/xhigh, subscription-based zero pricing)
• Updated test in src/api/providers/__tests__/openai-codex.spec.ts to cover the new model ID

Testing

• All openai-codex provider tests pass (7/7)
• All types package tests pass (149/149)
• Full lint and type-check pass across all packages

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[roomote]

Rooviewer   See task

No issues found. The rename from gpt-5.3-spark-codex to gpt-5.3-codex-spark is consistent with the naming convention of sibling codex models and correctly applied across both the model definition and the test.

Previous reviews

• 76ea80b: Review #1
• e032e68: Review #2
• 56afe93: Review #3

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