ci: Remove agent-scan (#38073)

As we saw, the agent scan is not as useful as we thought - so lets
remove it again

Signed-off-by: bircni <bircni@icloud.com>

.github/workflows/agent-scan.yml

@@ -1,113 +0,0 @@
-name: AgentScan
-
-on:
-  # jobs only use pinned actions and never checkout code
-  pull_request_target: # zizmor: ignore[dangerous-triggers]
-    types: [opened, reopened, synchronize, edited]
-
-concurrency:
-  group: agent-scan-${{ github.event.pull_request.number }}
-  cancel-in-progress: true
-
-permissions:
-  issues: write
-  pull-requests: write
-
-jobs:
-  agentscan:
-    runs-on: ubuntu-latest
-    steps:
-      - name: AgentScan
-        id: agentscan
-        uses: MatteoGabriele/agentscan-action@0a0c88109b5153dff2805f969f5060441efb7b65
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          skip-members: "dependabot[bot],renovate[bot], giteabot (backports)"
-          agent-scan-comment: false
-
-      - name: Handle flagged PR
-        if: contains(fromJSON('["automation","mixed"]'), steps.agentscan.outputs.classification) || steps.agentscan.outputs.community-flagged == 'true'
-        env:
-          CLASSIFICATION: ${{ steps.agentscan.outputs.classification }}
-          COMMUNITY_FLAGGED: ${{ steps.agentscan.outputs.community-flagged }}
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3
-        with:
-          script: |
-            const core = require('@actions/core');
-            const prNumber = context.payload.pull_request.number;
-            const classification = process.env.CLASSIFICATION;
-            const communityFlagged = process.env.COMMUNITY_FLAGGED === 'true';
-            const shouldClose = classification === 'automation' || communityFlagged;
-
-            const issue = context.payload.pull_request;
-            const labels = issue.labels?.map(l => l.name) || [];
-
-            if (!labels.includes('possible bot')) {
-              await github.rest.issues.addLabels({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: prNumber,
-                labels: ['possible bot'],
-              });
-            }
-
-            const comments = await github.paginate(github.rest.issues.listComments, {
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: prNumber,
-              per_page: 100,
-            });
-
-            const alreadyCommented = comments.some(c => c.user.type === 'Bot' && c.body.includes('AI Contribution Policy'));
-
-            if (!alreadyCommented) {
-              const closingNote = shouldClose
-                ? "We're closing this for now as the account looks automated. If we got that wrong, please just reopen the PR and we'll take another look."
-                : 'If this was flagged in error, we apologise! 😳 Just let us know. 🙏';
-
-              await github.rest.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: prNumber,
-                body: [
-                  "We've flagged this pull request as potentially AI-assisted.",
-                  '',
-                  'Gitea welcomes the thoughtful use of AI tools, but contributors must use them responsibly and clearly disclose any assistance. Please follow the AI Contribution Policy in `CONTRIBUTING.md` and update this PR accordingly:',
-                  '',
-                  'Maintainers may close PRs that do not disclose AI assistance, appear to be low-quality AI-generated content, or where the contributor cannot explain the changes.',
-                  '',
-                  'See: https://github.com/go-gitea/gitea/blob/main/CONTRIBUTING.md#ai-contribution-policy',
-                  '',
-                  closingNote,
-                ].join('\n'),
-              });
-            } else {
-              core.info('Possible-bot comment already exists - skipping comment.');
-            }
-
-            if (shouldClose && issue.state === 'open' && !alreadyCommented) {
-              await github.rest.pulls.update({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                pull_number: prNumber,
-                state: 'closed',
-                title: '🚨 unwelcome pr from bot 🚨',
-              });
-            }
-
-            const actionTaken = [
-              'Added `possible bot` label',
-              alreadyCommented ? null : 'posted policy comment',
-              shouldClose && !alreadyCommented ? 'closed PR' : null,
-            ].filter(Boolean).join(', ');
-
-            core.summary
-              .addHeading('AgentScan: Possible Bot Flag', 2)
-              .addTable([
-                [{ data: 'Property', header: true }, { data: 'Value', header: true }],
-                ['Pull Request', `#${prNumber}`],
-                ['Classification', classification],
-                ['Community flagged', String(communityFlagged)],
-                ['Action', actionTaken || 'No action (already handled)'],
-              ])
-              .write();