chore: drop * wildcard from CODEOWNERS to stop Dependabot review pings (#7)

The catch-all `* @hyperpolymath` line in CODEOWNERS causes GitHub to
auto-request review on every Dependabot PR (since every PR touches at
least one owned path under `*`). With the sole maintainer being the same
user, those review requests are pure notification noise.

This drops the wildcard line while preserving any path-specific
ownership and SPDX/license headers. Path-specific lines are intentional
and stay.

Human PRs from collaborators still trigger path-owner review where
applicable; Dependabot PRs typically only touch root manifest files
which are no longer matched.

Author: hyperpolymath

.github/CODEOWNERS

@@ -4,11 +4,10 @@
 #
 # Replace hyperpolymath with your GitHub username or team
 
-# Default owners for everything
-* @hyperpolymath
-
+# Default owners for everything
+
 # Security-sensitive files require explicit review
 SECURITY.md @hyperpolymath
 .github/workflows/ @hyperpolymath
 Trustfile.a2ml @hyperpolymath
-.machine_readable/ @hyperpolymath
+.machine_readable/ @hyperpolymath