Fix Codex ACP model selection

[binaricat]

Summary

• load Codex ACP model options dynamically instead of relying on the static preset list
• support ACP config option model/reasoning selectors when building the picker
• keep custom Codex configs from falling back to stale hardcoded models

Fixes #875

Tests

• node --test electron/bridges/ai/acpModels.test.cjs
• npm run lint
• npm test
• npm run build

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Flatten grouped ACP model options before parsing

normalizeConfigOptionsModels assumes modelOption.options is a flat array of values, but ACP allows SessionConfigSelectOptions to be grouped (SessionConfigSelectGroup with nested options). When an agent returns grouped model options, normalizeConfigOptionValue receives group objects (no value), all entries are filtered out, and modelValues becomes empty, so we silently fall back to legacy availableModels and lose the runtime model catalog this change is meant to use.

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