[FEAT]deprecate date dims

[priyam0k]

Summary of Changes

• Deprecate odims (Deprecate odims #1012) and ddims (Deprecate ddims #1013) on Triangle with FutureWarnings pointing to origin and development
• Update internal usage across core modules, estimators, adjustments, and tails to prevent internal warnings
• Preserve legacy pickle compatibility in Triangle.setstate so older saved instances unpickle cleanly
• Add test coverage verifying deprecation warnings when reading or setting both attributes and unpickling legacy objects
• Address ruff lint and formatting on touched files

Related GitHub Issue(s)

Closes #1012, closes #1013, refs #601, refs #1216

Additional Context for Reviewers

• Existing code reading or setting odims and ddims continues to work as expected for backward compatibility.
• Per discussion on Deprecate ddims #1013, _ddims is encapsulated as an array/index without introducing a DevelopmentIndex redesign, keeping public access on Triangle.development.
• This PR is stacked on feature/deprecate-dims (feat(core): deprecate vdims (#1011) and kdims (#1010) #1303).

Checklist

• I passed tests locally for both code (uv run pytest) and documentation changes (uv run --directory docs jb build . --builder=custom --custom-builder=doctest)

---

Note

Medium Risk
Wide refactor of origin/development axis handling touches core Triangle behavior and many estimators; legacy access still works but pickle migration and slicing/_slice axis naming changes could affect edge-case callers.

Overview
Deprecates direct use of Triangle.odims and Triangle.ddims in favor of the public origin and development APIs, while keeping backward compatibility.

Internal axis storage is renamed to _odims / _ddims across core triangle logic (slicing, arithmetic alignment, I/O, valuation math) and downstream estimators (development, methods, tails, bootstrap, concat). Library code now mutates the private fields so deprecation warnings are not triggered internally.

odims and ddims remain as compatibility properties that emit FutureWarning on get/set and delegate to the private arrays. Triangle.__setstate__ is extended to migrate pickles that still store odims/ddims (alongside existing kdims/vdims handling).

Tests are updated to assert on origin / development (or _odims / _ddims where appropriate), with new coverage for deprecation warnings and legacy unpickling.

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[codecov]

Codecov Report

❌ Patch coverage is 94.19355% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.07%. Comparing base (4df8368) to head (5668b6d).

Files with missing lines	Patch %	Lines
chainladder/development/munich.py	55.55%	4 Missing ⚠️
chainladder/adjustments/bootstrap.py	0.00%	0 Missing and 1 partial ⚠️
chainladder/development/incremental.py	50.00%	0 Missing and 1 partial ⚠️
chainladder/methods/base.py	66.66%	0 Missing and 1 partial ⚠️
chainladder/tails/constant.py	50.00%	1 Missing ⚠️
chainladder/tails/curve.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##           feature/deprecate-dims    #1304      +/-   ##
==========================================================
+ Coverage                   94.05%   94.07%   +0.01%     
==========================================================
  Files                          97       97              
  Lines                        5976     5996      +20     
  Branches                      776      778       +2     
==========================================================
+ Hits                         5621     5641      +20     
  Misses                        227      227              
  Partials                      128      128              

Flag	Coverage Δ
unittests	94.07% <94.19%> (+0.01%)	⬆️

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[github-actions]

Pyright Type Completeness

View the full pyright --verifytypes output for this commit

Project (full chainladder package, at this PR's head): 15.5% of exported symbols fully typed (230 / 1486)

	Known	Ambiguous	Unknown	Total
Project (head)	230	108	1148	1486

Other symbols referenced but not exported by chainladder: 13

	Known	Ambiguous	Unknown	Total
Other (head)	3	1	9	13

Symbols without documentation:

• Functions without docstring: 327
• Functions without default param: 0
• Classes without docstring: 8

Patch (exported symbols added or changed by this PR): 0.0% fully typed (0 / 5)

	Known	Ambiguous	Unknown	Total
Patch	0	0	5	5

Patch symbol details

Symbol	Status	Change
chainladder.core.tests.test_triangle.test_ddims_deprecation_warning	❌ unknown	new
chainladder.core.tests.test_triangle.test_odims_deprecation_warning	❌ unknown	new
chainladder.core.triangle.Triangle.ddims	❌ unknown	changed (was ✅ known)
chainladder.core.triangle.Triangle.odims	❌ unknown	changed (was ✅ known)
chainladder.development.tests.test_constant.test_constant_incr_cumulative_none	❌ unknown	new

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