v4.7.0: Add domain reputation/blocklist data source

- New DomainReputationResult model (status: clean/listed/unknown, listed
  sources, checked-at) and a `reputation(domain:)` method on ExternalDataService,
  mirroring the existing pluggable-URL enrichment pattern (ownership history,
  DNS history, extended subdomains, pricing). With no endpoint configured
  (the default; DomainDig ships no bundled third-party reputation dependency)
  it resolves to unavailable rather than "clean".
- New .reputation FeatureCapability/DataCapability, gated Pro+ like domainPricing.
- Threaded reputation/reputationError through LookupSnapshot and HistoryEntry
  (backward-compatible decode) so results persist with history entries.
- Auto-fetched in performLookup alongside pricing; surfaced as a "Reputation"
  info row, folded into DomainInsightEngine's risk score/factors and top-level
  insights (a listed domain raises risk score and adds a factor/insight), and
  exported in text, CSV, and JSON report output.
- Reputation-driven risk changes ride the existing change-severity pipeline, so
  a listed status flip is visible to monitoring the same way any other risk
  delta is, without bespoke monitoring wiring.

1 files changed, 4 insertions, 0 deletions

diff --git a/LookupSnapshot.swift b/LookupSnapshot.swift
index f9400f5..e0ccbbd 100644
--- a/LookupSnapshot.swift
+++ b/LookupSnapshot.swift
@@ -68,6 +68,8 @@ struct LookupSnapshot {
     let dnsHistoryError: String?
     let domainPricing: DomainPricingInsight?
     let domainPricingError: String?
+    let reputation: DomainReputationResult?
+    let reputationError: String?
     let portScanResults: [PortScanResult]
     let portScanError: String?
     let changeSummary: DomainChangeSummary?
@@ -150,6 +152,8 @@ extension HistoryEntry {
             dnsHistoryError: dnsHistoryError,
             domainPricing: domainPricing,
             domainPricingError: domainPricingError,
+            reputation: reputation,
+            reputationError: reputationError,
             portScanResults: portScanResults,
             portScanError: portScanError,
             changeSummary: changeSummary,