Addresses the second #177 review: - Architecture (the silent allowlist drift): the writable provider-setting keys were maintained by hand in two TS-uncheckable places — the key-loop in ai-settings.service and the SQL ALLOWED list in the generic workspace repo (a miss there silently dropped a field on persist, exactly what bit chatApiStyle). Introduce one typed source of truth PROVIDER_SETTINGS_KEYS in ai.types (`satisfies readonly (keyof AiProviderSettings)[]`), have the service consume it, and keep the repo's own copy (it can't import AI types) guarded by a parity test so any future drift fails in CI. - Tests: - ai.service.include-usage.spec: mocks @ai-sdk/openai-compatible and asserts the factory is called with { includeUsage: true, baseURL, apiKey, fetch, name } — `.provider` alone could not catch a dropped includeUsage (the token-usage zeroing regression); also asserts the 'openai' style does NOT use it. - ai-provider-settings-keys.spec: the allowlist parity check + DTO validation for chatApiStyle (@IsIn accepts both values, rejects garbage, optional). - CHANGELOG: [Unreleased] entries for the new "Protocol" / chatApiStyle setting and the default provider change (openai -> openai-compatible). (#175, #177) server + client tsc clean; 42 ai/settings specs green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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