Exclude crypto futes from `without_src` sym key

Extend the `col_sym_key` asset-type check in `start_backfill()`
to also exclude crypto-denominated futures (where `src` is
`'crypto_currency'` and `dst` is `'future'`) from the
`without_src=True` fqme path.

Also in `.brokers.binance` backend (it being the guilty culprit in the
discovery of this bug; and why i touched styling this code),

- reformat `make_sub()` fn sig to multiline style in
  `.binance.feed`.
- add backtick around `dict` in `make_sub()` docstring.
- reformat `or` conditionals to multiline style in
  `.binance.feed.get_mkt_info()`.

(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

@@ -203,9 +203,13 @@ async def stream_messages(
                 yield 'trade', piker_quote
 
 
-def make_sub(pairs: list[str], sub_name: str, uid: int) -> dict[str, str]:
+def make_sub(
+    pairs: list[str],
+    sub_name: str,
+    uid: int,
+) -> dict[str, str]:
     '''
-    Create a request subscription packet dict.
+    Create a request subscription packet `dict`.
 
     - spot:
       https://binance-docs.github.io/apidocs/spot/en/#live-subscribing-unsubscribing-to-streams
@@ -332,7 +336,8 @@ async def get_mkt_info(
         # TODO: handle coinm futes which have a margin asset that
         # is some crypto token!
         # https://binance-docs.github.io/apidocs/delivery/en/#exchange-information
-        or 'btc' in venue_lower
+        or
+        'btc' in venue_lower
     ):
         return None
 
@@ -343,12 +348,14 @@ async def get_mkt_info(
 
     if (
         venue
-        and 'spot' not in venue_lower
+        and
+        'spot' not in venue_lower
 
         # XXX: catch all in case user doesn't know which
         # venue they want (usdtm vs. coinm) and we can choose
         # a default (via config?) once we support coin-m APIs.
-        or 'perp' in venue_lower
+        or
+        'perp' in venue_lower
     ):
         if not mkt_mode:
             mkt_mode: str = f'{venue_lower}_futes'

piker/tsp/_history.py

@@ -739,12 +739,21 @@ async def start_backfill(
                 # including the dst[/src] source asset token. SO,
                 # 'tsla.nasdaq.ib' over 'tsla/usd.nasdaq.ib' for
                 # historical reasons ONLY.
-                if mkt.dst.atype not in {
+                if (
+                    mkt.dst.atype not in {
                         'crypto',
                         'crypto_currency',
                         'fiat',  # a "forex pair"
                         'perpetual_future',  # stupid "perps" from cex land
-                }:
+                    }
+                    and not (
+                        mkt.src.atype == 'crypto_currency'
+                        and
+                        mkt.dst.atype in {
+                            'future',
+                        }
+                    )
+                ):
                     col_sym_key: str = mkt.get_fqme(
                         delim_char='',
                         without_src=True,