feat(v2.7.0): add provenance, confidence, and reproducibility metadata

* add result provenance across major sections
* introduce confidence levels for ambiguous outputs
* distinguish observed facts from inferred summaries
* expand snapshot metadata for reproducibility
* improve error classification and partial snapshot handling
* include provenance and confidence in export
* add local notes for tracked domains and history

1 files changed, 6 insertions, 2 deletions

diff --git a/DomainDig/DomainAvailabilityService.swift b/DomainDig/DomainAvailabilityService.swift
index 9a350ef..59f6afa 100644
--- a/DomainDig/DomainAvailabilityService.swift
+++ b/DomainDig/DomainAvailabilityService.swift
@@ -15,8 +15,12 @@ struct DomainAvailabilityService {
         }
 
         let fallbackStatus = await checkViaDNSFallback(domain: normalizedDomain)
-        let method = fallbackStatus == .registered ? "dns" : "fallback"
-        debugLog(method, domain: normalizedDomain, status: fallbackStatus)
+        if fallbackStatus == .registered {
+            debugLog("dns-evidence", domain: normalizedDomain, details: "DNS exists but RDAP did not confirm registration")
+            return DomainAvailabilityResult(domain: normalizedDomain, status: .unknown)
+        }
+
+        debugLog("fallback", domain: normalizedDomain, status: fallbackStatus)
         return DomainAvailabilityResult(domain: normalizedDomain, status: fallbackStatus)
     }