refactor: split pilot architecture

Remove the obsolete dashboard now that Langfuse is the analytics surface.\nIntroduce focused transport, model, and configuration modules while preserving the ai_review facade, and document the current runtime architecture.

pilot/feedback_analyze.py

@@ -163,7 +163,7 @@ def _md_escape(s: str) -> str:
 def analyze(db_path: str, *, since_ts: Optional[int] = None,
             as_json: bool = False) -> str:
     """Build the daily report. Returns a markdown string by default;
-    `as_json=True` returns a structured dict (for tests + dashboards)."""
+    `as_json=True` returns a structured dict (for tests + automation)."""
     conn = feedback.init(db_path)
     try:
         findings = list(feedback.findings_with_votes(conn, since_ts=since_ts))
@@ -416,4 +416,4 @@ def main() -> int:
 
 if __name__ == "__main__":
     import sys
-    raise SystemExit(main())
+    raise SystemExit(main())