feat(agent): align with workflow@20261022 - turn_context messages and prompt tails

- merge main (b0ff2e0..c7ca781): workflow/20261022 moves dynamic context
  out of fixed prompts - collection/extraction prompts carry no inline vars;
  reference time and current form travel in the user message <turn_context>
  block; photo/confirm data kept at prompt tails
- prompts: all 8 files regenerated from 20261022 (byte-identity tests
  point at the new export)
- collect: user message = <turn_context>(本轮参考时间) + <user_input>;
  extraction message adds 当前表单; single trusted clock per turn threads
  through reply/extraction/repair
- photo: raw input only (20261022 photo nodes use system_text, no wrapper)
- workflow fake llm: unwraps <user_input> before event parsing
- fields: accident_time normalized to extraction format (YYYY年M月D日H点m分,
  strip zero padding) - fixes form assertion mismatch with padded output
- evals/run.py: trust_env=False - bypass Windows system proxy (registry
  proxy at 192.168.0.4:7897 was intercepting localhost and returning 503)
- verified: 172 unit tests; ALL golden suites pass on real model
  (46/46): collection_skip 12/12, photo_skip 4/4, no_false 2/2,
  button_guidance 12/12, non_motor_vehicle 14/14, time_confirmation 2/2

evals/run.py

@@ -484,6 +484,8 @@ def main() -> int:
         base_url=args.base_url.rstrip("/"),
         timeout=args.timeout,
         verify=not args.insecure,
+        # 忽略系统代理（Windows 注册表）：本地评测直连，避免代理 503
+        trust_env=False,
     ) as client:
         for case in cases:
             transcript = run_case(client, case)