ci: add /verify PR-comment command (relays to TechEngine)

Members can type /verify (or @TechEngineBot verify) on a PR to trigger on-demand
Tier 0 verification; relays to TechEngine which posts the band report as the bot. Refs #1

Author: Seungpyo1007

.github/workflows/verify-command.yml

@@ -0,0 +1,60 @@
+name: verify-command
+
+# Type `/verify` (or `@TechEngineBot verify`) in a TechAPI PR comment to trigger an
+# on-demand Tier 0 data verification. issue_comment fires in this repo, so the
+# listener lives here; it relays the request to TechEngine (which holds the bot
+# token + runs app.verify) via repository_dispatch. TechEngine posts the band
+# report back on the PR as TechEngineBot. Restricted to repo members/collaborators.
+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  contents: read
+  pull-requests: read
+  issues: write   # react to the command comment as acknowledgement
+
+jobs:
+  relay:
+    runs-on: ubuntu-latest
+    # Only on PR comments, only for the command, only from trusted authors.
+    if: >-
+      github.event.issue.pull_request &&
+      (startsWith(github.event.comment.body, '/verify') ||
+       contains(github.event.comment.body, '@TechEngineBot verify')) &&
+      contains(fromJSON('["OWNER","MEMBER","COLLABORATOR"]'), github.event.comment.author_association)
+    env:
+      ENGINE_TOKEN: ${{ secrets.ENGINE_TOKEN }}
+    steps:
+      - name: Dormant when ENGINE_TOKEN is unset
+        if: env.ENGINE_TOKEN == ''
+        run: echo "::warning::ENGINE_TOKEN not configured; cannot relay /verify to TechEngine."
+
+      - name: Acknowledge + relay to TechEngine
+        if: env.ENGINE_TOKEN != ''
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.ENGINE_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.issue.number;
+            // 👀 reaction so the requester sees the command was picked up.
+            try {
+              await github.rest.reactions.createForIssueComment({
+                owner, repo, comment_id: context.payload.comment.id, content: 'eyes',
+              });
+            } catch (e) {
+              core.info(`reaction skipped: ${e.message}`);
+            }
+            const pr = await github.rest.pulls.get({ owner, repo, pull_number: issue_number });
+            await github.rest.repos.createDispatchEvent({
+              owner: 'GetTechAPI',
+              repo: 'TechEngine',
+              event_type: 'techapi-verify',
+              client_payload: {
+                pr_number: String(issue_number),
+                head_sha: pr.data.head.sha,
+                requested_by: context.payload.comment.user.login,
+              },
+            });
+            core.info(`relayed /verify for PR #${issue_number} @ ${pr.data.head.sha}`);