chore(CODEOWNERS): drop /.github/workflows/ line (Refs standards#55)

Solo-owned repo: the workflow path line only causes Dependabot
github-actions PRs to auto-request review, driving the
review_requested notification flood. No functional gating lost.

Refs hyperpolymath/standards#55

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath

.github/CODEOWNERS

@@ -8,6 +8,5 @@
 
 # Security-sensitive files require explicit review
 SECURITY.md @hyperpolymath
-.github/workflows/ @hyperpolymath
 Trustfile.a2ml @hyperpolymath
-.machine_readable/ @hyperpolymath
+.machine_readable/ @hyperpolymath