fix: ruff lint (B904/UP037/I001/F401/E501) + feature parity

- _http.py: raise from err/None in all except clauses (B904)
- types.py: TYPE_CHECKING import for IicpError, remove quoted annotation
  (UP037), move IicpError import from bottom; add ChatOptions.timeout_ms
- client.py: use opts.timeout_ms in chat_async() if set
- tests/test_client.py: sort imports (I001), remove unused TaskConstraints
  (F401), wrap two long lines (E501)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: RobLe3

src/iicp_client/_http.py

@@ -54,14 +54,14 @@ async def get_json(
             message=f"Request to {url} timed out after {timeout_ms}ms",
             component=component,
             retryable=True,
-        )
+        ) from None
     except httpx.RequestError as exc:
         raise IicpError(
             code="IICP-E004",
             message=f"Network error reaching {url}: {exc}",
             component=component,
             retryable=True,
-        )
+        ) from exc
     if not resp.is_success:
         raise from_http(resp.status_code, _safe_json(resp), component)
     return resp.json()
@@ -91,14 +91,14 @@ async def post_json(
             message=f"Request to {url} timed out after {timeout_ms}ms",
             component=component,
             retryable=True,
-        )
+        ) from None
     except httpx.RequestError as exc:
         raise IicpError(
             code="IICP-E004",
             message=f"Network error reaching {url}: {exc}",
             component=component,
             retryable=True,
-        )
+        ) from exc
     elapsed = int((time.monotonic() - t0) * 1000)
     if not resp.is_success:
         raise from_http(resp.status_code, _safe_json(resp), component)

src/iicp_client/client.py

@@ -184,7 +184,7 @@ async def chat_async(
                 intent="urn:iicp:intent:llm:chat:v1",
                 payload=payload,
                 constraints=TaskConstraints(
-                    timeout_ms=self._cfg.timeout_ms,
+                    timeout_ms=opts.timeout_ms or self._cfg.timeout_ms,
                     qos=opts.qos,
                 ),
                 auth=TaskAuth(node_token=opts.node_token),

src/iicp_client/types.py

@@ -2,7 +2,10 @@
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from typing import Any
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    from iicp_client.errors import IicpError
 
 
 @dataclass
@@ -47,7 +50,7 @@ class TaskResponse:
     status: str
     result: dict[str, Any] | None
     metrics: TaskMetrics
-    error: "IicpError | None" = None
+    error: IicpError | None = None
 
 
 @dataclass
@@ -61,6 +64,7 @@ class ChatOptions:
     model: str | None = None
     max_tokens: int | None = None
     temperature: float | None = None
+    timeout_ms: int | None = None
     qos: str = "interactive"
     node_token: str | None = None
 
@@ -112,7 +116,3 @@ class NodeList:
     nodes: list[Node]
     query_ms: int
 
-
-# Forward reference resolution
-from iicp_client.errors import IicpError  # noqa: E402
-TaskResponse.__annotations__["error"] = "IicpError | None"

tests/test_client.py

@@ -1,23 +1,21 @@
 """Unit tests for IicpClient (ADR-016 SDK-01..SDK-06)."""
 from __future__ import annotations
 
+import httpx
 import pytest
 import respx
-import httpx
 
 from iicp_client import (
-    IicpClient,
-    IicpError,
-    ClientConfig,
     ChatMessage,
     ChatOptions,
-    TaskRequest,
-    TaskConstraints,
-    TaskAuth,
+    ClientConfig,
     DiscoverOptions,
+    IicpClient,
+    IicpError,
+    TaskAuth,
+    TaskRequest,
 )
 
-
 DIRECTORY = "https://iicp.test"
 NODE = "https://node.iicp.test"
 DISCOVER_URL = f"{DIRECTORY}/v1/discover"
@@ -134,7 +132,10 @@ async def _noop_sleep(_: float) -> None:
     respx.post(TASK_URL).mock(
         side_effect=[
             httpx.Response(503, json={"code": "IICP-E005", "message": "overload"}),
-            httpx.Response(200, json={"task_id": "t-2", "status": "success", "result": {}, "usage": {}}),
+            httpx.Response(
+                200,
+                json={"task_id": "t-2", "status": "success", "result": {}, "usage": {}},
+            ),
         ]
     )
     client = IicpClient(ClientConfig(directory_url=DIRECTORY, max_retries=3))
@@ -175,7 +176,10 @@ def test_chat_sdk02_openai_compat_shape():
                 "status": "success",
                 "result": {
                     "choices": [
-                        {"message": {"role": "assistant", "content": "Hello!"}, "finish_reason": "stop"}
+                        {
+                            "message": {"role": "assistant", "content": "Hello!"},
+                            "finish_reason": "stop",
+                        }
                     ],
                     "usage": {"prompt_tokens": 5, "completion_tokens": 3, "total_tokens": 8},
                     "model": "llama3",