Add GitHub Actions workflows for issue deduplication and auto-close

Co-authored-by: BukeLy <19304666+BukeLy@users.noreply.github.com>

.github/workflows/remove-autoclose-label.yml

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+# Removes the "autoclose" label whenever a human (non-bot) posts a new comment
+# on an issue that carries the label.  This resets the inactivity clock.
+name: Remove Autoclose Label on Human Activity
+
+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  issues: write
+
+jobs:
+  remove-autoclose:
+    # Only run for issue comments (not PR comments)
+    if: ${{ github.event.issue.pull_request == null }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Remove autoclose label if human commented
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const actor = context.actor;
+
+            // Ignore bot accounts
+            if (actor.endsWith('[bot]') || actor === 'github-actions') {
+              core.info(`Skipping bot comment from ${actor}`);
+              return;
+            }
+
+            const issue  = context.payload.issue;
+            const labels = (issue.labels || []).map(l => l.name);
+
+            if (!labels.includes('autoclose')) {
+              core.info('Issue does not have "autoclose" label – nothing to do.');
+              return;
+            }
+
+            await github.rest.issues.removeLabel({
+              owner:        context.repo.owner,
+              repo:         context.repo.repo,
+              issue_number: issue.number,
+              name:         'autoclose',
+            });
+
+            core.info(
+              `Removed "autoclose" label from #${issue.number} ` +
+              `after human activity by ${actor}`
+            );