Audit disabled lint rules and adopt the low-risk subset

[AndrewSazonov]

Inventories every disabled Ruff rule, measures how many issues each would
raise today, and recommends — rule by rule — which to switch on (with fixes)
and which to keep off because they reflect deliberate conventions. The
roadmap lives in docs/dev/plans/lint-rule-audit.md, with a
tools/lint_rule_audit.py helper that regenerates the inventory on demand.

Acts on the low-risk subset:

• Priority 0 — remove 5 ignores that flag nothing (B011, B017,
  N805, PLE, docs ANN).
• Priority 1 — D100/D104 module & package docstrings (79 added),
  DTZ005, the TD004/TD005 TODO-format rules, and test hygiene
  (I001/E501/F841).
• Tier B — enforce more pytest-lint sub-codes (PLR/PLW in tests) and
  route the library's stray diagnostic print()s through its Logger
  (T20).

Also refreshes the saved tutorial fit-result baselines for the merged
auto_estimate background feature (#193). Remaining Tier-B/C rules are
documented as deliberate keep-disabled recommendations.

Verification: pixi run check, unit-tests (2092), integration-tests
(160), and script-tests (25) all pass.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.24%. Comparing base (883c384) to head (6e3aeb3).
⚠️ Report is 101 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easydiffraction/analysis/calculators/cryspy.py	25.00%	3 Missing ⚠️
...easydiffraction/datablocks/experiment/item/base.py	0.00%	3 Missing ⚠️
...rc/easydiffraction/analysis/calculators/crysfml.py	33.33%	2 Missing ⚠️
src/easydiffraction/core/singleton.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #194      +/-   ##
===========================================
- Coverage    82.26%   80.24%   -2.02%     
===========================================
  Files           88      263     +175     
  Lines         5451    22210   +16759     
  Branches       454     2587    +2133     
===========================================
+ Hits          4484    17823   +13339     
- Misses         802     3411    +2609     
- Partials       165      976     +811     

Flag	Coverage Δ
integration	?
unittests	80.24% <43.75%> (+7.80%)	⬆️

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% <ø> (ø)
src/easydiffraction/__main__.py	73.10% <ø> (-0.81%)	⬇️
src/easydiffraction/analysis/__init__.py	100.00% <ø> (ø)
src/easydiffraction/analysis/analysis.py	62.75% <ø> (-4.58%)	⬇️
...c/easydiffraction/analysis/calculators/__init__.py	100.00% <ø> (ø)
src/easydiffraction/analysis/calculators/base.py	93.54% <ø> (+12.59%)	⬆️
src/easydiffraction/analysis/calculators/pdffit.py	89.09% <100.00%> (-4.53%)	⬇️
...rc/easydiffraction/analysis/categories/__init__.py	100.00% <ø> (ø)
...iffraction/analysis/categories/aliases/__init__.py	100.00% <ø> (ø)
...diffraction/analysis/categories/aliases/default.py	100.00% <ø> (ø)
... and 66 more

... and 212 files with indirect coverage changes

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