docs: clarify Hodges API wording

[mwyau]

Summary

• Clarify HodgesTracker(track_smoopy_optimization_scale=...) as the parameter controlling numerical scaling in the rectangular GDFP optimizer.
• Replace vague Hodges workers API wording with the supported execution controls: frame_workers, sht_threads, and mge_workers.
• State explicitly that SimpleTracker and HealpixTracker continue to accept workers.

Why

The Hodges documentation still used abstract API wording after the v0.7 API cleanup. Naming the affected tracker classes and parameters directly makes the supported interfaces explicit and avoids ambiguous terms such as "development API" or generic references to a "public" parameter.

Validation

• Reviewed the PR diff; only docs/hodges.md changes.
• Verified the documented class and parameter names match the v0.7 API.
• No code, numerical behavior, defaults, or scientific methodology changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.32%. Comparing base (7d67ffb) to head (255d1d7).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #205   +/-   ##
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  Coverage   78.32%   78.32%           
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  Files          59       59           
  Lines        9612     9612           
  Branches     1867     1867           
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  Hits         7529     7529           
  Misses       1368     1368           
  Partials      715      715           

Flag	Coverage Δ
integration	51.63% <ø> (ø)
parity	17.51% <ø> (ø)
unit	57.05% <ø> (ø)
unit-jit-coverage	72.49% <ø> (ø)
unit-jit-disabled	73.83% <ø> (ø)

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