fix: remove duplicate countIssuesInJSONLFile function

Fixes build failure in Test, Lint, Test (Windows), and Test Nix Flake jobs.
The function was defined in both init.go and doctor.go. Removed the init.go
version which is now unused. The doctor.go version (which calls
countJSONLIssues) is the canonical implementation.

Fixes #19780439467

cmd/bd/init.go

@@ -1395,37 +1395,7 @@ Aborting.`, yellow("⚠"), filepath.Base(jsonlPath), issueCount, cyan("bd doctor
 	return nil // No existing data found, safe to init
 }
 
-// countIssuesInJSONLFile counts valid issue lines in a JSONL file
-func countIssuesInJSONLFile(path string) int {
-	// #nosec G304 -- helper reads JSONL file in .beads directory
-	file, err := os.Open(path)
-	if err != nil {
-		return 0
-	}
-	defer file.Close()
 
-	count := 0
-	scanner := bufio.NewScanner(file)
-	// Use larger buffer for potentially large JSONL lines
-	scanner.Buffer(make([]byte, 0, 64*1024), 10*1024*1024)
-
-	for scanner.Scan() {
-		line := scanner.Text()
-		if line == "" {
-			continue
-		}
-
-		// Quick validation: check if it's valid JSON with an "id" field
-		var issue struct {
-			ID string `json:"id"`
-		}
-		if err := json.Unmarshal([]byte(line), &issue); err == nil && issue.ID != "" {
-			count++
-		}
-	}
-
-	return count
-}
 
 // setupClaudeSettings creates or updates .claude/settings.local.json with onboard instruction
 func setupClaudeSettings(verbose bool) error {