Add user_email field to Holmes chat params (#2084)

Declare user_email explicitly on HolmesChatParams and HolmesChatRequest
to match the existing pattern for sibling fields like request_type and
request_source. The frontend has started sending user_email; while the
extra="allow" config would forward it transparently, an explicit field
gives validation, IDE hints, and a documented contract.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: alonelish

src/robusta/core/model/base_params.py

@@ -209,6 +209,7 @@ class HolmesChatParams(HolmesParams):
     additional_system_prompt: Optional[str] = None
     request_type: Optional[str] = None
     request_source: Optional[str] = None
+    user_email: Optional[str] = None
     source_ref: Optional[str] = None
     conversation_id: Optional[str] = None
     conversation_source: Optional[str] = None

src/robusta/core/reporting/holmes.py

@@ -53,6 +53,7 @@ class HolmesChatRequest(BaseModel):
     additional_system_prompt: Optional[str] = None
     request_type: Optional[str] = None
     request_source: Optional[str] = None
+    user_email: Optional[str] = None
     source_ref: Optional[str] = None
     conversation_id: Optional[str] = None
     conversation_source: Optional[str] = None