Merge branch 'worktree-task-cancellation': task cancellation feature

# Conflicts:
#	packages/cloud-platform/cloud/schema.py

packages/cloud-platform/cloud/internal_api/models.py

@@ -95,6 +95,7 @@ class LeaseRenewalRequest(BaseModel):
 class LeaseRenewalResponse(BaseModel):
     status: Literal["renewed"]
     lease_expires_at: datetime
+    cancel_requested: bool = False
 
 
 class TerminalResultRequest(BaseModel):
@@ -102,7 +103,7 @@ class TerminalResultRequest(BaseModel):
     task_id: str = Field(min_length=1)
     attempt: int = Field(ge=1)
     lease_id: str = Field(min_length=1)
-    status: Literal["done", "failed"]
+    status: Literal["done", "failed", "cancelled"]
     failure_reason: str | None = None
     result: dict[str, Any] | None = None
 
@@ -121,6 +122,11 @@ class HostTaskSubmissionResponse(BaseModel):
     task_id: str
 
 
+class HostTaskCancellationResponse(BaseModel):
+    task_id: str
+    status: str
+
+
 class StaleLeaseConflict(BaseModel):
     code: Literal["stale_lease"] = "stale_lease"
     detail: str