Migrate module path from kyle/ to mc/ org

All import paths updated to git.wntrmute.dev/mc/. Bumps mcdsl to v1.2.0,
mc-proxy to v1.1.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PROJECT_PLAN_V1.md

@@ -32,7 +32,7 @@ else builds on.
 structure, and configure tooling.
 
 **Deliverables:**
-- `go.mod` with module path `git.wntrmute.dev/kyle/mcp`
+- `go.mod` with module path `git.wntrmute.dev/mc/mcp`
 - `Makefile` with standard targets (build, test, vet, lint, proto,
   proto-lint, clean, all)
 - `.golangci.yaml` with platform-standard linter config