Refactor code structure for improved readability and maintainability

.specify/memory/constitution.md

@@ -1,12 +1,12 @@
 <!--
   Sync Impact Report
-  Version change: 1.0.0 → 1.1.0
+  Version change: 1.1.0 → 1.1.1
   Modified principles: None
-  Added sections:
-    - Principle VI: Test-Driven Development (new core principle)
+  Added sections: N/A
   Modified sections:
-    - Development Standards — Testing bullet upgraded from SHOULD to MUST;
-      added TDD-specific guidance (test file conventions, coverage expectations)
+    - Dependency Governance — Removed `github.com/miekg/dns` from
+      Currently Approved External Dependencies (replaced by
+      `golang.org/x/net/dns/dnsmessage` in feature 001)
   Removed sections: N/A
   Templates requiring updates:
     - .specify/templates/plan-template.md — ⚠ pending (Constitution Check
@@ -165,9 +165,7 @@ into an auditable process.
 
 ### Currently Approved External Dependencies
 
-| Module | Justification |
-|--------|---------------|
-| `github.com/miekg/dns` | The Go standard library `net` package does not support querying a specific DNS server by address. This tool's core purpose requires directing queries to a user-specified resolver, which `net.Resolver` cannot do without low-level `Dialer` workarounds that replicate what `miekg/dns` provides. This is a legacy dependency approved under a grandfather clause — if a `golang.org/x` or stdlib alternative becomes viable under Go 1.20, migration is preferred. |
+None. All external functionality is provided by `golang.org/x/net/dns/dnsmessage` (covered by the `golang.org/x/*` blanket approval above).
 
 ## Development Standards
 
@@ -207,4 +205,4 @@ prior practices that conflict with its contents.
   reviewer MUST verify compliance with Principle II and the Dependency
   Governance table above.
 
-**Version**: 1.1.0 | **Ratified**: 2026-03-03 | **Last Amended**: 2026-03-03
+**Version**: 1.1.1 | **Ratified**: 2026-03-03 | **Last Amended**: 2026-03-04