fix(git-hooks): add missing husky wrappers for commit-msg and pre-push

Added missing .husky/commit-msg and .husky/pre-push wrappers that call
the canonical hooks in .git-hooks/. Updated .husky/pre-commit to call
.git-hooks/pre-commit directly instead of the old .husky/security-checks.sh.

This fixes the issue where AI attribution wasn't being stripped from
commit messages because husky wasn't triggering the commit-msg hook.

Hook flow:
  Git → .husky/_/commit-msg → .husky/commit-msg → .git-hooks/commit-msg

The .git-hooks/ directory contains the canonical hook implementations
that should be called by the husky wrappers.

Author: jdalton

.husky/commit-msg

@@ -0,0 +1,2 @@
+# Run commit message validation and auto-strip AI attribution.
+.git-hooks/commit-msg "$1"

.husky/pre-commit

@@ -1,5 +1,5 @@
 # Run security checks first.
-.husky/security-checks.sh
+.git-hooks/pre-commit
 
 if [ -z "${DISABLE_PRECOMMIT_LINT}" ]; then
   pnpm lint --staged

.husky/pre-push

@@ -0,0 +1,2 @@
+# Run pre-push security validation.
+.git-hooks/pre-push "$@"