feat: add conflict resolution, linter validation, and SEARCH/REPLACE system
- Add git-style conflict resolution with visual diff highlighting - Add buffer-local keymaps: co/ct/cb/cn for conflict resolution - Add floating menu with auto-show after code injection - Add linter validation that auto-checks LSP diagnostics after accepting code - Add SEARCH/REPLACE block parsing with fuzzy matching - Add new commands: CoderConflictMenu, CoderLintCheck, CoderLintFix - Update README with complete keymaps reference and issue reporting guide - Update CHANGELOG and llms.txt with full documentation - Clean up code comments and documentation Co-Authored-By: Claude <noreply@anthropic.com>
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