Move `reg_err_types` imports to module-level

Hoist inline `from tractor._exceptions import reg_err_types` calls up to
the module-level import block across 5 files so they follow normal
import ordering.

Other,
- `kraken/broker.py`: same; also add `ConfigurationError` import and
  raise on missing `src_fiat` config field instead of `KeyError`.
- `storage/__init__.py`: same; also switch from relative to absolute
  `piker.*` imports and reorder the import block.
- comment out stray `await tractor.pause()` in binance `feed.py`.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

piker/brokers/binance/feed.py

@@ -383,7 +383,8 @@ async def get_mkt_info(
         if not mkt_mode:
             mkt_mode: str = f'{venue_lower}_futes'
 
-    await tractor.pause()
+    # tracing
+    # await tractor.pause()
 
     async with open_cached_client(
         'binance',

piker/brokers/kraken/api.py

@@ -35,6 +35,7 @@ import hashlib
 import hmac
 import base64
 import tractor
+from tractor._exceptions import reg_err_types
 import trio
 
 from piker import config
@@ -118,7 +119,6 @@ class InvalidKey(ValueError):
 
     '''
 
-from tractor._exceptions import reg_err_types
 reg_err_types([InvalidKey])
 
 

piker/brokers/kraken/broker.py

@@ -36,6 +36,7 @@ from typing import (
 from bidict import bidict
 import trio
 import tractor
+from tractor._exceptions import reg_err_types
 
 from piker.accounting import (
     Position,
@@ -45,6 +46,9 @@ from piker.accounting import (
     open_trade_ledger,
     open_account,
 )
+from piker.config import (
+    ConfigurationError,
+)
 from piker.clearing import(
     OrderDialogs,
 )
@@ -97,7 +101,7 @@ MsgUnion = Union[
 class TooFastEdit(Exception):
     'Edit requests faster then api submissions'
 
-from tractor._exceptions import reg_err_types
+
 reg_err_types([TooFastEdit])
 
 
@@ -464,7 +468,11 @@ async def open_trade_dialog(
         # (much like the web UI let's you set an "account currency")
         # such that all positions (nested or flat) will be translated to
         # this source currency's terms.
-        src_fiat = client.conf['src_fiat']
+        src_fiat = client.conf.get('src_fiat')
+        if not src_fiat:
+            raise ConfigurationError(
+                'No `src_fiat: str` field defined in `brokers.toml`'
+            )
 
         # auth required block
         acctid = client._name

piker/data/validate.py

@@ -28,13 +28,13 @@ from typing import (
 )
 
 from msgspec import field
+from tractor._exceptions import reg_err_types
 
 from piker.types import Struct
 from piker.accounting import (
     Asset,
     MktPair,
 )
-from tractor._exceptions import reg_err_types
 from ._util import log
 
 

piker/service/marketstore.py

@@ -42,6 +42,7 @@ from msgspec.msgpack import (
 # import pyqtgraph as pg
 import numpy as np
 import tractor
+from tractor._exceptions import reg_err_types
 from trio_websocket import open_websocket_url
 from anyio_marketstore import (  # noqa
     open_marketstore_client,
@@ -382,7 +383,6 @@ def quote_to_marketstore_structarray(
 class MarketStoreError(Exception):
     "Generic marketstore client error"
 
-from tractor._exceptions import reg_err_types
 reg_err_types([MarketStoreError])
 
 

piker/storage/__init__.py

@@ -42,15 +42,17 @@ from typing import (
 )
 
 import numpy as np
+from tractor._exceptions import reg_err_types
 
-from .. import config
-from ..service import (
-    check_for_service,
-)
-from ..log import (
+from piker import config
+from piker.log import (
     get_logger,
     get_console_log,
 )
+from piker.service import (
+    check_for_service,
+)
+
 subsys: str = 'piker.storage'
 
 log = get_logger(subsys)
@@ -151,7 +153,6 @@ class StorageConnectionError(ConnectionError):
 
     '''
 
-from tractor._exceptions import reg_err_types
 reg_err_types([
     TimeseriesNotFound,
     StorageConnectionError,