refactor(bus): type outbound runtime events

tests/cli/test_interactive_retry_wait.py

@@ -3,6 +3,7 @@ from unittest.mock import patch
 
 import pytest
 
+from nanobot.bus.outbound_events import ProgressEvent, RetryWaitEvent
 from nanobot.cli import commands
 
 
@@ -14,7 +15,8 @@ async def test_interactive_retry_wait_is_rendered_as_progress_even_when_progress
     channels_config = SimpleNamespace(send_progress=False, send_tool_hints=False)
     msg = SimpleNamespace(
         content="Model request failed, retry in 2s (attempt 1).",
-        metadata={"_retry_wait": True},
+        event=RetryWaitEvent(content="Model request failed, retry in 2s (attempt 1)."),
+        metadata={},
     )
 
     async def fake_print(text: str, active_thinking: object | None, renderer=None) -> None:
@@ -40,7 +42,8 @@ async def test_reasoning_displayed_when_show_reasoning_enabled():
     )
     msg = SimpleNamespace(
         content="Let me think about this...",
-        metadata={"_progress": True, "_reasoning": True},
+        event=ProgressEvent(content="Let me think about this...", reasoning=True),
+        metadata={},
     )
 
     with patch("nanobot.cli.commands._print_cli_reasoning", side_effect=lambda t, th, r=None: calls.append(t)):
@@ -59,7 +62,8 @@ async def test_reasoning_delta_displayed_when_show_reasoning_enabled():
     )
     msg = SimpleNamespace(
         content="I should search first.",
-        metadata={"_progress": True, "_reasoning_delta": True},
+        event=ProgressEvent(content="I should search first.", reasoning_delta=True),
+        metadata={},
     )
 
     with patch("nanobot.cli.commands._print_cli_reasoning", side_effect=lambda t, th, r=None: calls.append(t)):
@@ -81,7 +85,8 @@ async def test_reasoning_delta_buffers_until_sentence_boundary():
         first = await commands._maybe_print_interactive_progress(
             SimpleNamespace(
                 content="The",
-                metadata={"_progress": True, "_reasoning_delta": True},
+                event=ProgressEvent(content="The", reasoning_delta=True),
+                metadata={},
             ),
             None,
             channels_config,
@@ -90,7 +95,8 @@ async def test_reasoning_delta_buffers_until_sentence_boundary():
         second = await commands._maybe_print_interactive_progress(
             SimpleNamespace(
                 content=" user asked.",
-                metadata={"_progress": True, "_reasoning_delta": True},
+                event=ProgressEvent(content=" user asked.", reasoning_delta=True),
+                metadata={},
             ),
             None,
             channels_config,
@@ -114,7 +120,8 @@ async def test_reasoning_end_flushes_buffered_delta():
         delta = await commands._maybe_print_interactive_progress(
             SimpleNamespace(
                 content="The user asked",
-                metadata={"_progress": True, "_reasoning_delta": True},
+                event=ProgressEvent(content="The user asked", reasoning_delta=True),
+                metadata={},
             ),
             None,
             channels_config,
@@ -123,7 +130,8 @@ async def test_reasoning_end_flushes_buffered_delta():
         end = await commands._maybe_print_interactive_progress(
             SimpleNamespace(
                 content="",
-                metadata={"_progress": True, "_reasoning_end": True},
+                event=ProgressEvent(reasoning_end=True),
+                metadata={},
             ),
             None,
             channels_config,
@@ -143,7 +151,8 @@ async def test_reasoning_hidden_when_show_reasoning_disabled():
     )
     msg = SimpleNamespace(
         content="Let me think about this...",
-        metadata={"_progress": True, "_reasoning": True},
+        event=ProgressEvent(content="Let me think about this...", reasoning=True),
+        metadata={},
     )
 
     with patch("nanobot.cli.commands._print_cli_reasoning") as mock_reasoning:
@@ -162,7 +171,8 @@ async def test_non_reasoning_progress_not_affected_by_show_reasoning():
     )
     msg = SimpleNamespace(
         content="working on it...",
-        metadata={"_progress": True},
+        event=ProgressEvent(content="working on it..."),
+        metadata={},
     )
 
     async def fake_print(text: str, thinking=None, renderer=None):
@@ -185,7 +195,8 @@ async def test_reasoning_shown_when_send_progress_disabled():
     )
     msg = SimpleNamespace(
         content="Let me think about this...",
-        metadata={"_progress": True, "_reasoning": True},
+        event=ProgressEvent(content="Let me think about this...", reasoning=True),
+        metadata={},
     )
 
     with patch(