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/review_ports.py

@@ -0,0 +1,17 @@
+"""Stable interfaces shared by the review pipeline and its adapters."""
+from __future__ import annotations
+
+from typing import Protocol
+
+
+class Forge(Protocol):
+    def get(self, path: str, accept: str = "application/json") -> tuple[int, bytes]: ...
+    def post(self, path: str, body: dict) -> tuple[int, bytes]: ...
+
+
+class Reviewer(Protocol):
+    def review(self, system: str, user: str, max_tokens: int) -> str: ...
+
+
+class Telemetry(Protocol):
+    def emit(self, **event: object) -> None: ...