Remove the AI Watchdog workflow for now

It's failing with a 404 that I don't know how to fix (or don't have the time to investigate). It works fine when run locally.

.github/workflows/aiwatchdog.yml

@@ -1,22 +0,0 @@
-name: AI Detection
-on:
-  # Use pull_request_target instead of pull_request (we need the secrets.OPENAI_API_KEY to be available for forks)
-  pull_request_target:
-    types: [opened, ready_for_review]
-permissions:
-  contents: read
-  pull-requests: write
-jobs:
-  detect-ai:
-    runs-on: ubuntu-latest
-    if: ${{ !github.event.pull_request.draft }}
-    steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
-      - name: AI Watchdog
-        uses: bep/ai-watchdog@e85b3674edb3f174950e7622b87350ad54b2013e # temporary fork (probably)
-        with:
-          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
-          pr-label: AI Suspect
-          fail-when-confident: false
-          # CSV list.
-          pr-user-logins-skip: dependabot[bot],jmooring