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>

lua/codetyper/tree.lua

@@ -273,9 +273,15 @@ local function is_project_initialized(root)
 end
 
 --- Initialize tree logging (called on setup)
+--- Only creates .coder/ folder for git projects (has .git/ folder)
 ---@param force? boolean Force re-initialization even if cached
 ---@return boolean success
 function M.setup(force)
+  -- Only initialize for git projects
+  if not utils.is_git_project() then
+    return false -- Not a git project, don't create .coder/
+  end
+
   local coder_folder = M.get_coder_folder()
   if not coder_folder then
     return false
@@ -291,9 +297,9 @@ function M.setup(force)
     return true
   end
 
-  -- Ensure .coder folder exists
+  -- Ensure .coder folder exists (silent, no asking)
   if not M.ensure_coder_folder() then
-    utils.notify("Failed to create .coder folder", vim.log.levels.ERROR)
+    -- Silent failure - don't bother user
     return false
   end