feature: added agent rules for clean jetbrains kotlin code

[adietish]

provides rules for clean kotlin/jetbrains plugin code when using claude code and cursor

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a Kotlin and JetBrains plugin standards document, links Cursor to it through a symbolic link, and imports it into CLAUDE.md.

Changes

Kotlin development rules

Layer / File(s)	Summary
Kotlin and plugin rule definitions .claude/rules/jetbrains_kotlin.md, .claude/rules/jetbrains_kotlin.md2	Defines scoped Kotlin coding, JetBrains plugin architecture, error handling, documentation, UI copy, refactoring, and response-format rules.
Editor rule linking .cursor/rules/jetbrains_kotlin.mdc	Replaces the Cursor rule content with a symbolic link to the shared Markdown rule.
Claude rule import CLAUDE.md	Imports the shared Kotlin rule document into Claude configuration.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: azatsarynnyy, vrubezhny

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title matches the main change: adding JetBrains/Kotlin agent rules for clean code.
Description check	✅ Passed	The description is directly related to the new Kotlin/JetBrains rules for Claude Code and Cursor.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.55%. Comparing base (71098f6) to head (9d2b139).
⚠️ Report is 388 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #339       +/-   ##
==========================================
+ Coverage   0.00%   24.55%   +24.55%     
==========================================
  Files          4      104      +100     
  Lines         26     4414     +4388     
  Branches       0      846      +846     
==========================================
+ Hits           0     1084     +1084     
- Misses        26     3156     +3130     
- Partials       0      174      +174     

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