feat(v2.4.0): add JSON output, CLI foundation, and shared report layer

* introduce DomainReport as canonical output model
* add JSON export for single and batch results
* create DomainReportBuilder for reusable report construction
* add CLI target using shared inspection pipeline
* refactor services for UI-independent usage
* ensure consistency across TXT, CSV, and JSON outputs

1 files changed, 39 insertions, 0 deletions

diff --git a/DomainDigCLI.swift b/DomainDigCLI.swift
new file mode 100644
index 0000000..73f7028
--- /dev/null
+++ b/DomainDigCLI.swift
@@ -0,0 +1,39 @@
+import Foundation
+
+@main
+struct DomainDigCLI {
+    static func main() async {
+        let arguments = Array(CommandLine.arguments.dropFirst())
+
+        guard let command = CommandLine.arguments.first else {
+            fputs("usage: domaindig <domain> [--json]\n", stderr)
+            Foundation.exit(1)
+        }
+        _ = command
+
+        let wantsJSON = arguments.contains("--json") || arguments.contains("-j")
+        let domains = arguments.filter { !$0.hasPrefix("-") }
+
+        guard let domain = domains.first, !domain.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
+            fputs("usage: domaindig <domain> [--json]\n", stderr)
+            Foundation.exit(1)
+        }
+
+        let inspectionService = DomainInspectionService()
+        let report = await inspectionService.inspect(domain: domain)
+
+        do {
+            let data = try DomainReportExporter.data(
+                for: report,
+                format: wantsJSON ? .json : .text
+            )
+            FileHandle.standardOutput.write(data)
+            if data.last != 0x0A {
+                FileHandle.standardOutput.write(Data([0x0A]))
+            }
+        } catch {
+            fputs("domaindig: \(error.localizedDescription)\n", stderr)
+            Foundation.exit(1)
+        }
+    }
+}