Rename v2 setup crate to toolchain-config

[mdittmer]

---

• 　  Move from type params to &dyn T; start trying to work with toml_const #3373
• 　  Introduce toml_const dependency; r/Setup/Install; bind url<->archive-format and checksum<->digest-algorithm #3372
• 　  Start cleaning up vibe-coded 'Rename v2..Introduce standalone' changes #3371
• 　  Introduce standalone static-toml integration example and robust parent directory creation interfaces #3370
• 　  Abstract ArchiveFormat and HashReader over generic Extractor and Digest boundaries #3369
• 　  Refactor Config layout and rework platform binding parameters #3368
• 👉 Rename v2 setup crate to toolchain-config #3367
• 　  [anneal][v2] Initial setup implementation #3362
• 　  [anneal][v2] Introduce nix-based toolchain management #3361

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.88%. Comparing base (8c6bd23) to head (030de3f).

Additional details and impacted files

@@                        Coverage Diff                         @@
##           G4j6evgrreyqc3s3lhca63lo6rn4l5rzo    #3367   +/-   ##
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  Coverage                              91.88%   91.88%           
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  Files                                     20       20           
  Lines                                   6076     6076           
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  Hits                                    5583     5583           
  Misses                                   493      493           

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