Aligns Gateway history and session list thinking-default resolution so backend session state matches the Control UI default label:
- `chat.history` now falls back through the shared Gateway session thinking-default resolver.
- Explicit session overrides still win, then owning `agents.list[].thinkingDefault`, then global/model/catalog defaults.
- `sessions.list` catalog-aware thinking defaults are covered by focused regressions.
PR by @jpreagan.
Validated in Blacksmith Testbox `tbx_01kq9t1aeqrz1mj598vvqv9dpg`:
- `pnpm test:serial src/gateway/session-utils.test.ts src/gateway/server.sessions.gateway-server-sessions-a.test.ts src/gateway/server.chat.gateway-server-chat.test.ts` (141 passed)
- `OPENCLAW_TESTBOX=1 pnpm check:changed`
a722da3ed0