🔥(ci) remove unused Anthropic security step

Drop the Anthropic security step from the project CI, as it is no
longer used and only added noise to the pipeline.

.github/workflows/security.yaml

@@ -1,29 +0,0 @@
-# /!\
-# Security Note: This action is not hardened against prompt injection attacks and should only be used
-# to review trusted PRs. Configure your repository with "Require approval for all external contributors"
-# to ensure workflows only run after a maintainer has reviewed the PR.
-name: Security Review
-
-permissions:
-  pull-requests: write  # Needed for leaving PR comments
-  contents: read
-
-on:
-  pull_request:
-    branches:
-      - 'main'
-
-jobs:
-  security:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-        with:
-          ref: ${{ github.event.pull_request.head.sha || github.sha }}
-          fetch-depth: 2
-
-      - uses: anthropics/claude-code-security-review@0c6a49f1fa56a1d472575da86a94dbc1edb78eda
-        with:
-          comment-pr: true
-          exclude-directories: docs,gitlint,LICENSES,bin
-          claude-api-key: ${{ secrets.CLAUDE_API_KEY }}