Improve analysis reliability and expand refinement workflows

[AndrewSazonov]

• Adds LaM7O3 P02.1 synchrotron X-ray and LMO ECHIDNA neutron refinement tutorials with automatic backgrounds, constraints, absorption, site mixing, and oxygen-position refinement.
• Adds a Bayesian exercise notebook using BUMPS DREAM to explore correlations, credible intervals, and posterior predictions.
• Calculates CrysFML constant-wavelength patterns at exact measurement coordinates, improving irregular-grid and position-correction handling.
• Enables Chebyshev backgrounds for CrysFML and verifies its FCJ asymmetry against FullProf.
• Makes automatic line-segment background estimation honor excluded regions and pending exclusion changes.
• Fixes interactive Plotly rendering in Google Colab with version-matched assets and visible retry errors.
• Corrects FullProf occupancy and scale references, enabling direct intensity comparisons without artificial scale fitting in matching examples.
• Renames TOF size/strain parameters and CIF tags by removing redundant _g and _l suffixes.
• Shows a clear error and lowercase suggestion when structure or experiment datablock names contain uppercase letters, preventing later calculation failures.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.34%. Comparing base (883c384) to head (bd5204e).
⚠️ Report is 127 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #218      +/-   ##
===========================================
+ Coverage    82.26%   90.34%   +8.08%     
===========================================
  Files           88      284     +196     
  Lines         5451    24783   +19332     
  Branches       454     2912    +2458     
===========================================
+ Hits          4484    22390   +17906     
- Misses         802     1761     +959     
- Partials       165      632     +467     

Flag	Coverage Δ
integration	?
unittests	90.34% <ø> (+17.89%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...rc/easydiffraction/analysis/calculators/crysfml.py	69.19% <ø> (+21.05%)	⬆️
src/easydiffraction/analysis/calculators/cryspy.py	55.04% <ø> (-34.30%)	⬇️
...tion/analysis/categories/sequential_fit/default.py	100.00% <ø> (ø)
src/easydiffraction/analysis/minimizers/bumps.py	85.50% <ø> (ø)
src/easydiffraction/core/category.py	95.12% <ø> (-4.88%)	⬇️
src/easydiffraction/core/datablock.py	82.14% <ø> (-3.80%)	⬇️
src/easydiffraction/core/guard.py	87.50% <ø> (+4.40%)	⬆️
src/easydiffraction/core/validation.py	94.16% <ø> (+4.60%)	⬆️
src/easydiffraction/core/variable.py	92.90% <ø> (ø)
...ocks/experiment/categories/background/chebyshev.py	81.94% <ø> (ø)
... and 19 more

... and 300 files with indirect coverage changes

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