fix(honcho): thread registry rides agent.memory_provider.spawn_context_thread

main folded the plugin's contextvars-inheriting thread wrapper into
agent.memory_provider.spawn_context_thread. The registry this stack adds for
join_plugin_threads keeps a thin client.spawn_context_thread that calls the core
spawner and records the thread under its owner; the four spawn sites import it
from client. main's inherit-profile test builds a real provider now that
_spawn_write is an instance method (the owner is what gets joined).

plugins/memory/honcho/__init__.py

@@ -23,7 +23,7 @@ from agent.coding_context import INTERACTIVE_CODING_PLATFORMS as _LOCAL_PLATFORM
 from agent.turn_author import a2a_key
 from plugins.memory.honcho.client import HonchoClientConfig, resolve_config_path
 from plugins.memory.honcho.client import _host_block, _HostLookup
-from plugins.memory.honcho.client import join_plugin_threads
+from plugins.memory.honcho.client import join_plugin_threads, spawn_context_thread
 from plugins.memory.honcho.dialectic import DialecticMixin
 from plugins.memory.honcho.session_peers import assistant_peer_id_for, sanitize_peer_id
 from plugins.memory.honcho.session_context import usable_honcho_summary

plugins/memory/honcho/dialectic.py

@@ -7,7 +7,7 @@ import re
 import threading
 import time
 
-from agent.memory_provider import spawn_context_thread
+from plugins.memory.honcho.client import spawn_context_thread
 
 logger = logging.getLogger("plugins.memory.honcho")
 

plugins/memory/honcho/recall_sync.py

@@ -7,7 +7,7 @@ import math
 import threading
 import time
 
-from agent.memory_provider import spawn_context_thread
+from plugins.memory.honcho.client import spawn_context_thread
 
 logger = logging.getLogger("plugins.memory.honcho")
 

plugins/memory/honcho/session.py

@@ -10,7 +10,7 @@ from dataclasses import dataclass, field
 from datetime import datetime
 from typing import Any, TYPE_CHECKING
 
-from agent.memory_provider import spawn_context_thread
+from plugins.memory.honcho.client import spawn_context_thread
 from plugins.memory.honcho.client import get_honcho_client
 from plugins.memory.honcho.session_auth import HonchoAuthError, SessionAuthMixin
 from plugins.memory.honcho.session_context import SessionContextMixin

tests/plugins/memory/test_provider_threads_inherit_profile.py

@@ -85,7 +85,7 @@ def _hindsight(seen, tmp_path):
 def _honcho(seen, tmp_path):
     from plugins.memory.honcho import HonchoMemoryProvider
 
-    return [HonchoMemoryProvider._spawn_write(_probe_home(seen), "honcho-test", "failed %s")]
+    return [HonchoMemoryProvider()._spawn_write(_probe_home(seen), "honcho-test", "failed %s")]
 
 
 _PROVIDERS = {