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, 89 insertions, 0 deletions

diff --git a/LookupSnapshot.swift b/LookupSnapshot.swift
new file mode 100644
index 0000000..3a35eff
--- /dev/null
+++ b/LookupSnapshot.swift
@@ -0,0 +1,89 @@
+import Foundation
+
+struct LookupSnapshot {
+    let historyEntryID: UUID?
+    let domain: String
+    let timestamp: Date
+    let trackedDomainID: UUID?
+    let resolverDisplayName: String
+    let resolverURLString: String
+    let totalLookupDurationMs: Int?
+    let dnsSections: [DNSSection]
+    let dnsError: String?
+    let availabilityResult: DomainAvailabilityResult?
+    let suggestions: [DomainSuggestionResult]
+    let sslInfo: SSLCertificateInfo?
+    let sslError: String?
+    let hstsPreloaded: Bool?
+    let httpHeaders: [HTTPHeader]
+    let httpSecurityGrade: String?
+    let httpStatusCode: Int?
+    let httpResponseTimeMs: Int?
+    let httpProtocol: String?
+    let http3Advertised: Bool
+    let httpHeadersError: String?
+    let reachabilityResults: [PortReachability]
+    let reachabilityError: String?
+    let ipGeolocation: IPGeolocation?
+    let ipGeolocationError: String?
+    let emailSecurity: EmailSecurityResult?
+    let emailSecurityError: String?
+    let ownership: DomainOwnership?
+    let ownershipError: String?
+    let ptrRecord: String?
+    let ptrError: String?
+    let redirectChain: [RedirectHop]
+    let redirectChainError: String?
+    let subdomains: [DiscoveredSubdomain]
+    let subdomainsError: String?
+    let portScanResults: [PortScanResult]
+    let portScanError: String?
+    let changeSummary: DomainChangeSummary?
+    let isLive: Bool
+}
+
+extension HistoryEntry {
+    var snapshot: LookupSnapshot {
+        LookupSnapshot(
+            historyEntryID: id,
+            domain: domain,
+            timestamp: timestamp,
+            trackedDomainID: trackedDomainID,
+            resolverDisplayName: resolverDisplayName,
+            resolverURLString: resolverURLString,
+            totalLookupDurationMs: totalLookupDurationMs,
+            dnsSections: dnsSections,
+            dnsError: nil,
+            availabilityResult: availabilityResult,
+            suggestions: suggestions,
+            sslInfo: sslInfo,
+            sslError: sslError,
+            hstsPreloaded: hstsPreloaded,
+            httpHeaders: httpHeaders,
+            httpSecurityGrade: HTTPSecurityGrade.grade(for: httpHeaders).rawValue,
+            httpStatusCode: nil,
+            httpResponseTimeMs: nil,
+            httpProtocol: nil,
+            http3Advertised: false,
+            httpHeadersError: httpHeadersError,
+            reachabilityResults: reachabilityResults,
+            reachabilityError: reachabilityError,
+            ipGeolocation: ipGeolocation,
+            ipGeolocationError: ipGeolocationError,
+            emailSecurity: emailSecurity,
+            emailSecurityError: emailSecurityError,
+            ownership: ownership,
+            ownershipError: ownershipError,
+            ptrRecord: ptrRecord,
+            ptrError: ptrError,
+            redirectChain: redirectChain,
+            redirectChainError: redirectChainError,
+            subdomains: subdomains,
+            subdomainsError: subdomainsError,
+            portScanResults: portScanResults,
+            portScanError: portScanError,
+            changeSummary: changeSummary,
+            isLive: false
+        )
+    }
+}