Add OpenAI responses mode and custom auth headers (#906)

* Add OpenAI profile responses and custom auth header support

* Fix knowledge graph config reference in query loop

* Address OpenAI profile review edge cases

* Remove unused getGlobalConfig import

Delete an unused import of getGlobalConfig from src/query.ts. This cleans up dead code and avoids unused-import lint warnings; no functional behavior changes.

* Address follow-up OpenAI profile review comments

* Refine OpenAI responses auth review fixes

* Fix custom auth header default scheme

src/query.ts

@@ -110,7 +110,6 @@ import {
 } from './bootstrap/state.js'
 import { createBudgetTracker, checkTokenBudget } from './query/tokenBudget.js'
 import { count } from './utils/array.js'
-
 /* eslint-disable @typescript-eslint/no-require-imports */
 const snipModule = feature('HISTORY_SNIP')
   ? (require('./services/compact/snipCompact.js') as typeof import('./services/compact/snipCompact.js'))