Sync classify_scalar v1.1.2

[vincentlaucsb]

Summary

• Sync the unmodified classify_scalar.hpp from the published v1.1.2 release, built from upstream PR #3.
• Update the provenance lock to upstream commit 991598ef24582aadd2bbee132aae3a1468b0b1c8 and its SHA-256.
• Bring in the upstream signed 64-bit floating-boundary fix without a local patch.

Validation

• python tools/sync_classify_scalar.py --check passed against upstream bytes.
• MSVC C++20 csv_test build passed; selected scalar classification and field tests passed (79 assertions in 7 cases).
• MSVC C++11 library build passed.
• git diff --check passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.58%. Comparing base (8585a49) to head (ae60c68).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
- Coverage   91.64%   91.58%   -0.06%     
==========================================
  Files          55       55              
  Lines        3541     3541              
  Branches     1044     1044              
==========================================
- Hits         3245     3243       -2     
- Misses        114      115       +1     
- Partials      182      183       +1     

Flag	Coverage Δ
cpp	91.43% <ø> (-0.07%)	⬇️
python	93.64% <ø> (ø)

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