fix: pass username to SmartDataAdjuster so ThoughtSpotDeployer can auth

ThoughtSpotDeployer requires username but SmartDataAdjuster wasn't
accepting or forwarding it, causing liveboard context load to fail.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

chat_interface.py

@@ -436,6 +436,7 @@ I'll research a company, build a Snowflake schema, generate realistic data, and
                         llm_model=llm_model,
                         ts_url=ts_url,
                         ts_secret=ts_secret,
+                        username=ts_user,
                         prompt_logger=self._prompt_logger,
                     )
                     adjuster.connect()
@@ -3987,6 +3988,7 @@ Ask these questions to showcase ThoughtSpot's AI capabilities:
                             llm_model=llm_model,
                             ts_url=self.settings.get('thoughtspot_url') or None,
                             ts_secret=self.settings.get('thoughtspot_trusted_auth_key') or None,
+                            username=self._get_effective_user_email(),
                             prompt_logger=self._prompt_logger,
                         )
                         adjuster.connect()

smart_data_adjuster.py

@@ -38,12 +38,13 @@ class SmartDataAdjuster:
 
     def __init__(self, database: str, schema: str, liveboard_guid: str,
                  llm_model: str = None, ts_url: str = None, ts_secret: str = None,
-                 prompt_logger=None):
+                 username: str = None, prompt_logger=None):
         self.database = database
         self.schema = schema
         self.liveboard_guid = liveboard_guid
         self.ts_url = (ts_url or "").strip() or None
         self.ts_secret = (ts_secret or "").strip() or None
+        self.username = (username or "").strip() or None
 
         self.llm_model = (llm_model or "").strip()
         if not self.llm_model:
@@ -76,6 +77,7 @@ class SmartDataAdjuster:
 
         self.ts_client = ThoughtSpotDeployer(
             base_url=self.ts_url or None,
+            username=self.username,
             secret_key=self.ts_secret or None,
         )
         self.ts_client.authenticate()