Update __init__.py

Author: beacoder

app/controllers/__init__.py

@@ -1,16 +1,48 @@
-"""Controller package: protocol, runner, manager."""
+"""Controllers: all of the app's business logic.
 
+Two kinds of module live here:
+
+*Machinery* — ``runner`` (sandboxes and harness processes), ``protocol``
+(the harness event contract), ``manager`` (run lifecycle, event
+fan-out).
+
+*Request logic* — ``accounts``, ``conversations``, ``files``, ``runs``,
+``secrets``, ``usage``.  One module per area of the domain, holding the
+rules that decide what a caller may do and what the agent is told.
+
+``app.routes`` is deliberately thin on top of these: it wires HTTP
+(dependencies, status codes, response schemas) and nothing else.  A
+controller refuses work by raising from ``errors``, so it never needs to
+know the caller speaks HTTP.
+"""
+
+from .errors import (
+    Conflict,
+    DomainError,
+    Forbidden,
+    InvalidRequest,
+    NotFound,
+    PayloadTooLarge,
+    Unauthorized,
+)
 from .manager import Controller
 from .protocol import ProtocolEvent, RunOutcome, apply_event, parse_line, parse_stream
 from .runner import ExecResult, Runner, ServerRunner, get_runner
 
 __all__ = [
+    "Conflict",
     "Controller",
+    "DomainError",
     "ExecResult",
+    "Forbidden",
+    "InvalidRequest",
+    "NotFound",
+    "PayloadTooLarge",
     "ProtocolEvent",
     "RunOutcome",
     "Runner",
     "ServerRunner",
+    "Unauthorized",
     "apply_event",
     "get_runner",
     "parse_line",