fix: Make enqueue_links and export_to overloads consistent with their implementations

[vdusek]

Bumps ty from 0.0.73 to 0.0.78 in the lock, and fixes the overloads that bump breaks.

Since ty 0.0.74, **kwargs: Unpack[TD] over an open TypedDict is read as also accepting any undeclared keyword as object. That extra catch-all makes an implementation which types such a keyword unassignable to an overload that leaves the keyword to **kwargs. On master, ty 0.0.78 reports 4 diagnostics: the EnqueueLinksFunction overloads, the assignability of the enqueue_links implementation to that protocol, and Dataset.export_to.

Each EnqueueLinksFunction overload now also names the keywords of the other mode, typed None. The implementation is assignable to both overloads again, and selector and requests become mutually exclusive for ty as well, which mypy and pyright already enforced.

Dataset.export_to no longer declares collect_all_keys on the implementation. It flows through **kwargs into the CSV exporter, the only one that takes it. Both overloads are unchanged.

The public API is untouched: same call signatures, no renamed or added types. One runtime edge case changes. export_to(key, 'json', collect_all_keys=True) used to ignore the flag and now raises TypeError from json.dump, which is how every other CSV-only keyword already behaved with JSON. mypy and pyright always rejected that call.

The source fix passes ty 0.0.73, 0.0.78 and 0.0.79, so it should survive the next few bumps. mypy and pyright each lose diagnostics and gain none. Once this lands, #2220 carries the rest of the lock refresh.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.75%. Comparing base (999f0c4) to head (ff8344b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2225   +/-   ##
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  Coverage   93.75%   93.75%           
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  Files         181      181           
  Lines       12865    12865           
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  Hits        12061    12061           
  Misses        804      804           

Flag	Coverage Δ
unit	93.75% <100.00%> (ø)

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