Add persistent fit results and project-centric workflows

[AndrewSazonov]

This PR adds persistent analysis state and sidecar storage for deterministic and Bayesian fit results, restores Bayesian sampler settings when reloading projects, expands project-focused CLI workflows, and updates tutorials and ADRs to match the new save/load model.

[codecov]

Codecov Report

❌ Patch coverage is 83.44322% with 452 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.77%. Comparing base (ab68979) to head (208a3e7).

Files with missing lines	Patch %	Lines
src/easydiffraction/io/results_sidecar.py	68.35%	64 Missing and 42 partials ⚠️
src/easydiffraction/analysis/analysis.py	82.99%	52 Missing and 39 partials ⚠️
src/easydiffraction/display/plotting.py	47.97%	57 Missing and 20 partials ⚠️
src/easydiffraction/utils/utils.py	45.90%	29 Missing and 4 partials ⚠️
src/easydiffraction/__main__.py	57.14%	26 Missing and 1 partial ⚠️
src/easydiffraction/analysis/minimizers/bumps.py	76.23%	17 Missing and 7 partials ⚠️
src/easydiffraction/project/display.py	55.26%	13 Missing and 4 partials ⚠️
src/easydiffraction/project/project.py	80.59%	7 Missing and 6 partials ⚠️
...c/easydiffraction/analysis/fit_helpers/tracking.py	75.51%	6 Missing and 6 partials ⚠️
src/easydiffraction/utils/environment.py	76.08%	7 Missing and 4 partials ⚠️
... and 10 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #178      +/-   ##
===========================================
- Coverage    85.98%   85.77%   -0.21%     
===========================================
  Files          173      210      +37     
  Lines        13374    15884    +2510     
  Branches      1574     1831     +257     
===========================================
+ Hits         11499    13624    +2125     
- Misses        1293     1548     +255     
- Partials       582      712     +130     

Flag	Coverage Δ
integration	71.77% <75.20%> (+1.77%)	⬆️
unittests	78.09% <72.67%> (-0.36%)	⬇️

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

Files with missing lines	Coverage Δ
src/easydiffraction/__init__.py	100.00% <100.00%> (ø)
src/easydiffraction/analysis/__init__.py	100.00% <100.00%> (ø)
...rc/easydiffraction/analysis/categories/__init__.py	100.00% <100.00%> (ø)
...alysis/categories/bayesian_convergence/__init__.py	100.00% <100.00%> (ø)
...nalysis/categories/bayesian_convergence/default.py	100.00% <100.00%> (ø)
...nalysis/categories/bayesian_convergence/factory.py	100.00% <100.00%> (ø)
...ategories/bayesian_distribution_caches/__init__.py	100.00% <100.00%> (ø)
...categories/bayesian_distribution_caches/factory.py	100.00% <100.00%> (ø)
...alysis/categories/bayesian_pair_caches/__init__.py	100.00% <100.00%> (ø)
...nalysis/categories/bayesian_pair_caches/factory.py	100.00% <100.00%> (ø)
... and 53 more

... and 2 files with indirect coverage changes

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