Add maintainability preset

[bartveneman]

Summary

• Adds a new maintainability preset config (src/configs/maintainability.ts)
• Includes rules that limit complexity and enforce conventions to keep CSS easy to reason about and manage over time
• Documents the preset in the Usage section of README.md

Rules included

Rule	Reason
max-average-declarations-per-rule	Limits bloated rules
max-average-selector-complexity	Keeps selectors simple on average
max-average-selectors-per-rule	Limits overly broad rules
max-average-specificity	Prevents specificity creep
max-declarations-per-rule	Limits bloated individual rules
max-important-ratio	Discourages overuse of !important
max-selector-complexity	Prevents excessively complex selectors
max-selectors-per-rule	Limits selector lists
max-unique-units	Encourages a consistent unit system
min-declaration-uniqueness-ratio	Catches repetitive declarations
min-selector-uniqueness-ratio	Catches repetitive selectors
no-anonymous-layers	Enforces named layers for reorderability
no-property-browserhacks	Disallows legacy browser hacks

https://claude.ai/code/session_01CAf77nH8mZGYP7Rrx24PvB

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.85%. Comparing base (de1fba3) to head (7e5f58e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #102   +/-   ##
=======================================
  Coverage   97.85%   97.85%           
=======================================
  Files          34       34           
  Lines         981      981           
  Branches      250      250           
=======================================
  Hits          960      960           
  Misses         18       18           
  Partials        3        3           

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[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 1.76kB (2.57%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
stylelintPlugin-esm	70.24kB	1.76kB (2.57%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: stylelintPlugin-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
configs/maintainability.d.mts (New)	886 bytes	886 bytes	100.0% 🚀
configs/maintainability.mjs (New)	871 bytes	871 bytes	100.0% 🚀

Files in configs/maintainability.mjs:

• ./src/configs/maintainability.ts → Total Size: 824 bytes