docs: add CODEOWNERS

CODEOWNERS

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+# CODEOWNERS — auto-assigns reviewers for merge requests
+# Syntax: <pattern> <@user or @group>
+# Docs: https://docs.gitlab.com/ee/user/project/code_owners.html
+
+# Default: all changes require pezkuwichain org review
+* @pezkuwichain
+
+# Runtime & consensus — critical paths
+/pezkuwi/runtime/                    @pezkuwichain
+/pezkuwi/primitives/                 @pezkuwichain
+/bizinikiwi/primitives/consensus/    @pezkuwichain
+
+# CI/CD & build infrastructure
+/.gitlab-ci.yml                      @pezkuwichain
+/.gitlab/                            @pezkuwichain
+/.github/                            @pezkuwichain
+/rust-toolchain.toml                 @pezkuwichain
+/deny.toml                           @pezkuwichain
+
+# Asset Hub & staking (financial critical)
+/pezkuwi/asset-hub/                  @pezkuwichain
+
+# People Chain & identity
+/pezkuwi/people/                     @pezkuwichain
+
+# Parachain / cumulus
+/pezcumulus/                         @pezkuwichain
+
+# XCM
+/pezkuwi/xcm/                        @pezkuwichain
+
+# Documentation
+/docs/                               @pezkuwichain
+*.md                                 @pezkuwichain
+