- Extract `plan_type` from JWT claims and default missing values to `free`
- Include `plan_type` in token data, token storage, auth attributes, and file synthesis
- Ensure `plan_type` is maintained across token refresh flows
- Preserve empty map allocations during auth object cloning
- Resolve model `is_compat` status via model info, config index, or model entries in Codex executor
- Skip wiping `reasoning.content` and stripping reasoning IDs during Responses sanitization when `is_compat` is enabled
- Pass resolved compat flag across standard, streaming, compact, and WebSocket Codex request flows
Closes: #5930
- Removed deprecated interceptor and executor-related methods, including `callRequestInterceptor`, `callResponseInterceptor`, and `callStreamChunkInterceptor`.
- Consolidated unused logic and pruned redundant imports to streamline `adapters.go`.
- No functional changes.
