Apply estate standardization: governance docs, contractiles, CI/CD cleanup

Author: hyperpolymath

.github/CODEOWNERS

@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: MPL-2.0
+# CODEOWNERS - Define code review assignments for GitHub
+# See: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# Default: sole maintainer for all files
+* @hyperpolymath
+
+# Security-sensitive files require explicit ownership
+SECURITY.md @hyperpolymath
+.github/workflows/ @hyperpolymath
+.machine_readable/ @hyperpolymath
+contractiles/ @hyperpolymath
+
+# License files
+LICENSE @hyperpolymath
+LICENSES/ @hyperpolymath
+
+# Configuration
+.gitignore @hyperpolymath
+.github/ @hyperpolymath
+
+# Documentation
+README* @hyperpolymath
+CONTRIBUTING* @hyperpolymath
+CODE_OF_CONDUCT* @hyperpolymath
+GOVERNANCE* @hyperpolymath
+MAINTAINERS* @hyperpolymath
+CHANGELOG* @hyperpolymath
+ROADMAP* @hyperpolymath
+
+# Build and CI
+Justfile @hyperpolymath
+Makefile @hyperpolymath
+*.sh @hyperpolymath