feat(api): structured run events via /v1/runs SSE endpoint

Add POST /v1/runs to start async agent runs and GET /v1/runs/{run_id}/events
for SSE streaming of typed lifecycle events (tool.started, tool.completed,
message.delta, reasoning.available, run.completed, run.failed).

Changes the internal tool_progress_callback signature from positional
(tool_name, preview, args) to event-type-first
(event_type, tool_name, preview, args, **kwargs). Existing consumers
filter on event_type and remain backward-compatible.

Adds concurrency limit (_MAX_CONCURRENT_RUNS=10) and orphaned run sweep.

Fixes logic inversion in cli.py _on_tool_progress where the original PR
would have displayed internal tools instead of non-internal ones.

Co-authored-by: Mibayy <mibayy@users.noreply.github.com>

acp_adapter/events.py

@@ -54,14 +54,18 @@ def make_tool_progress_cb(
 
     Signature expected by AIAgent::
 
-        tool_progress_callback(name: str, preview: str, args: dict)
+        tool_progress_callback(event_type: str, name: str, preview: str, args: dict, **kwargs)
 
-    Emits ``ToolCallStart`` for each tool invocation and tracks IDs in a FIFO
+    Emits ``ToolCallStart`` for ``tool.started`` events and tracks IDs in a FIFO
     queue per tool name so duplicate/parallel same-name calls still complete
-    against the correct ACP tool call.
+    against the correct ACP tool call.  Other event types (``tool.completed``,
+    ``reasoning.available``) are silently ignored.
     """
 
-    def _tool_progress(name: str, preview: str, args: Any = None) -> None:
+    def _tool_progress(event_type: str, name: str = None, preview: str = None, args: Any = None, **kwargs) -> None:
+        # Only emit ACP ToolCallStart for tool.started; ignore other event types
+        if event_type != "tool.started":
+            return
         if isinstance(args, str):
             try:
                 args = json.loads(args)

acp_adapter/server.py

@@ -12,7 +12,6 @@ import acp
 from acp.schema import (
     AgentCapabilities,
     AuthenticateResponse,
-    AuthMethodAgent,
     AvailableCommand,
     AvailableCommandsUpdate,
     ClientCapabilities,
@@ -43,6 +42,12 @@ from acp.schema import (
     Usage,
 )
 
+# AuthMethodAgent was renamed from AuthMethod in agent-client-protocol 0.9.0
+try:
+    from acp.schema import AuthMethodAgent
+except ImportError:
+    from acp.schema import AuthMethod as AuthMethodAgent  # type: ignore[attr-defined]
+
 from acp_adapter.auth import detect_provider, has_provider
 from acp_adapter.events import (
     make_message_cb,