Fix Daubechies derivative scaling and complete coverage

[NAThompson]

Exercise explicit refinements, absolute-error mode, interior derivatives, and the Haar wavelet. Remove obsolete interpolators and migrate the remaining example to matched_holder_aos.

Correct missing grid-spacing factors in cardinal quintic and septic derivatives, including septic node evaluation. Add cubic-polynomial regressions for both data layouts and non-unit grid spacing.

Fixes #1101

[NAThompson]

@mborland : Would you mind spending a few of you claude credits reviewing this?

It appears I had missed some major scale factors here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.42%. Comparing base (c6d79d9) to head (9a43658).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #1455    +/-   ##
=========================================
  Coverage    95.41%   95.42%            
=========================================
  Files          831      831            
  Lines        69588    69693   +105     
=========================================
+ Hits         66400    66506   +106     
+ Misses        3188     3187     -1     

Files with missing lines	Coverage Δ
...th/interpolators/detail/quintic_hermite_detail.hpp	80.80% <100.00%> (ø)
...ath/interpolators/detail/septic_hermite_detail.hpp	85.31% <100.00%> (ø)
...oost/math/special_functions/daubechies_scaling.hpp	100.00% <ø> (ø)
test/daubechies_scaling_test.cpp	95.50% <100.00%> (+0.38%)	⬆️
test/daubechies_wavelet_test.cpp	95.19% <100.00%> (+2.43%)	⬆️
test/quintic_hermite_test.cpp	100.00% <100.00%> (ø)
test/septic_hermite_test.cpp	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[mborland]

@mborland : Would you mind spending a few of you claude credits reviewing this?

It appears I had missed some major scale factors here.

Seems like it's good:

[NAThompson]

Build failure is this:

 The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2C277A0A352154E5 NO_PUBKEY 1E9377A2BA9EF27F
Reading package lists...
W: GPG error: https://ppa.launchpadcontent.net/ubuntu-toolchain-r/test/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2C277A0A352154E5 NO_PUBKEY 1E9377A2BA9EF27F
E: The repository 'https://ppa.launchpadcontent.net/ubuntu-toolchain-r/test/ubuntu jammy InRelease' is not signed.
Error: Process completed with exit code 100.