These translate-path builders had no runtime consumers: the translator route
uses executor.buildUrl/buildHeaders, and the barrel re-exports were unused.
Removing them eliminates the parallel URL/header build path (single source of
truth = executors). Drop their private helpers and the now-unused clineAuth
import. Golden executor snapshots + gate: no regression.
Co-authored-by: Cursor <cursoragent@cursor.com>
Add shared OAuth credential lifecycle manager with provider-aware refresh
decisions. Implement CodexExecutor.refreshCredentials so 401/403 retry
refresh works for Codex, track lastRefreshAt and refresh before the
upstream stale-token window, preserve omitted idToken, and add
per-connection single-flight refresh to avoid refresh-token rotation races.
Merged from PR #1664.
Co-authored-by: Cursor <cursoragent@cursor.com>
