Add 502/504 and hyphenated Time-out to retry list

HF API returned '504 Gateway Time-out' which wasn't matched by
the existing retry logic (only checked 500/503/429). Now retries
on all common gateway errors (502, 504) and both timeout spellings.

https://claude.ai/code/session_01DPirJ78YYN4fJUvUFJ5D6V

layer2/customer_sim.py

@@ -103,7 +103,7 @@ class CustomerSimulator:
                         "Get more credits at https://huggingface.co/settings/billing"
                     ) from e
                 # Retry on transient server errors (500, 503, 429, timeouts)
-                if any(code in err_str for code in ("500", "503", "429", "timeout", "Timeout")):
+                if any(code in err_str for code in ("500", "502", "503", "504", "429", "timeout", "Timeout", "Time-out")):
                     last_err = e
                     wait = 2 ** (attempt + 1)  # 2, 4, 8, 16s
                     logger.warning(

layer2/hf_agent.py

@@ -93,7 +93,7 @@ class HFAgent:
                         "HF API credits depleted. "
                         "Get more credits at https://huggingface.co/settings/billing"
                     ) from e
-                if any(code in err_str for code in ("500", "503", "429", "timeout", "Timeout")):
+                if any(code in err_str for code in ("500", "502", "503", "504", "429", "timeout", "Timeout", "Time-out")):
                     last_err = e
                     wait = 2 ** (attempt + 1)  # 2, 4, 8, 16s
                     logger.warning(