refactor(b2): eliminate all cross-plugin imports - contracts for worker/agent_runner/workstream, declared dependency for wiki

app/core/worker.py

@@ -170,12 +170,7 @@ async def on_startup(ctx: dict[str, Any]) -> None:
         if search_contract is not None:
             factory = async_session
             async with factory() as db:
-                # auto_register_providers is not exposed via contract yet;
-                # use the contract's get_search_registry to access providers
-                from app.plugins.builtins.unified_search.provider_registry import (
-                    auto_register_providers,
-                )
-                await auto_register_providers(db)
+                await search_contract.auto_register_providers(db)
             logger.info("Search providers registered for worker")
         else:
             logger.debug("Unified search plugin not available — skipping provider registration")

app/plugins/builtins/automation/agent_runner.py

@@ -110,9 +110,9 @@ async def run_agent(
         try:
             from app.plugins.builtins.contracts import get_contract
             mail_contract = get_contract("mail")
-            if mail_contract and hasattr(mail_contract, "get_recent_mails"):
+            if mail_contract and hasattr(mail_contract, "Mail"):
                 from sqlalchemy import select as _select
-                from app.plugins.builtins.mail.models import Mail
+                Mail = mail_contract.Mail
                 async with factory() as db:
                     mail_q = await db.execute(
                         _select(Mail)
@@ -379,23 +379,16 @@ async def run_agent(
         komm = get_contract_registry().get("kommunikation")
         if komm:
             async with factory() as db:
-                # Find or create agent conversation room
-                from app.plugins.builtins.contracts import get_contract as _get_contract
-                _komm_contract = _get_contract("kommunikation")
-                from app.plugins.builtins.kommunikation.models import CommConversation
-                from sqlalchemy import select as sa_select
+                # Find or create agent conversation room via contract
+                # (find_locked_room_id matches create_plugin_room semantics)
                 room_title = f"Agent: {agent.name}"
-                existing = await db.execute(
-                    sa_select(CommConversation).where(
-                        CommConversation.tenant_id == agent.tenant_id,
-                        CommConversation.title == room_title,
-                        CommConversation.is_locked.is_(True),
-                        CommConversation.locked_by == "automation",
-                        CommConversation.deleted_at.is_(None),
+                conv_id = await komm.find_locked_room_id(
+                    db=db,
+                    tenant_id=agent.tenant_id,
+                    plugin_name="automation",
+                    title=room_title,
                 )
-                )
-                conv = existing.scalar_one_or_none()
-                if not conv:
+                if not conv_id:
                     room = await komm.create_plugin_room(
                         db=db,
                         tenant_id=agent.tenant_id,
@@ -405,8 +398,6 @@ async def run_agent(
                         participant_type="agent",
                     )
                     conv_id = uuid.UUID(room["conversation_id"])
-                else:
-                    conv_id = conv.id
 
                 # Post result as message with action_card block
                 status = result_data.get("status", "unknown")

app/plugins/builtins/tasks/workstream.py

@@ -67,10 +67,10 @@ async def post_task_to_workstream(
     try:
         from app.plugins.builtins.contracts import get_contract
         _komm = get_contract("kommunikation")
-        if _komm and hasattr(_komm, "send_message"):
+        if not _komm or not hasattr(_komm, "send_message"):
+            logger.warning("kommunikation contract unavailable - skipping workstream post for task %s", task.id)
+            return None
         send_message = _komm.send_message
-        else:
-            from app.plugins.builtins.kommunikation.services import send_message
 
         block_type = "goal_card" if task.task_type in ("goal", "milestone") else "task_card"
         block_data = _goal_card_data(task) if block_type == "goal_card" else _task_card_data(task)

app/plugins/builtins/unified_search/contracts.py

@@ -50,6 +50,15 @@ class UnifiedSearchContract:
     simple_search = staticmethod(simple_search)
     BaseSearchProvider = BaseSearchProvider
 
+    @staticmethod
+    async def auto_register_providers(db: Any) -> None:
+        """Register providers for all active plugins (worker startup path)."""
+        from app.plugins.builtins.unified_search.provider_registry import (
+            auto_register_providers as _auto_register,
+        )
+
+        await _auto_register(db)
+
     @classmethod
     def get_function(cls, name: str):
         """Return a callable exposed by this contract, or None if absent."""

app/plugins/builtins/wiki/plugin.py

@@ -13,7 +13,7 @@ class WikiPlugin(BasePlugin):
         version="1.0.0",
         display_name="Wiki",
         description="Knowledge articles with Markdown, categories, tags, versioning, entity links.",
-        dependencies=["permissions"],
+        dependencies=["permissions", "unified_search"],
         routes=[
             PluginRouteDef(path="/api/v1/wiki", module="app.plugins.builtins.wiki.routes", router_attr="router"),
         ],