chore(ci): codeowners architecture-only during code freeze (#1662)

Locks down platform CODEOWNERS to @opentdf/architecture alone during
code freeze for release.

---------

Co-authored-by: Ryan Schumacher <[email protected]>

Author: jakedoublev

CODEOWNERS

@@ -1,43 +1,4 @@
-# CODEOWNERS
-
-* @opentdf/maintainers
-
-## Lib
-
-/.github/     @opentdf/architecture @opentdf/maintainers
-/lib/         @opentdf/architecture @opentdf/maintainers
-/lib/ocrypto  @opentdf/architecture
-
-## General
-
-.gitignore    @opentdf/maintainers
-go.mod        @opentdf/maintainers
-*.sum         @opentdf/maintainers
-
-### Documentation
-
-*.md          @opentdf/maintainers
-/docs/        @opentdf/maintainers
-/examples/    @opentdf/maintainers
-
-## Services
-
-/protocol/go/          @opentdf/architecture @opentdf/maintainers
-
-### Policy
-
-/service/migrations/   @opentdf/cli @opentdf/architecture
-/service/policy/       @opentdf/cli @opentdf/architecture
-
-### Key Access Server
-
-/service/kas/           @opentdf/kas @opentdf/architecture
-
-## SDK
-
-/sdk/ @opentdf/go-sdk @opentdf/architecture
-
-## High Security Area
+# CODEOWNERS - code freeze
 
+* @opentdf/architecture
 CODEOWNERS     @opentdf/architecture @opentdf/security
-LICENSE        @opentdf/architecture