feat: Add rebrand CI/CD workflows to main branch

- Add 72 rebrand workflow files (polkadot→pezkuwi, substrate→bizinikiwi, cumulus→pezcumulus)
- Add GitHub actions, issue templates, and configs
- Removed unnecessary workflows (fork-sync, gitspiegel, upstream-tracker, sync-templates, backport)
- Renamed zombienet test files to match new naming convention

.github/workflows/review-bot.yml

@@ -0,0 +1,46 @@
+name: Review Bot
+on:
+  workflow_run:
+    workflows:
+      - Review-Trigger
+    types:
+      - completed
+  workflow_dispatch:
+    inputs:
+      pr-number:
+        description: "Number of the PR to evaluate"
+        required: true
+        type: number
+
+jobs:
+  review-approvals:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate token
+        id: app_token
+        uses: actions/create-github-app-token@67018539274d69449ef7c02e8e71183d1719ab42 # v2.1.4
+        with:
+          app-id: ${{ secrets.REVIEW_APP_ID }}
+          private-key: ${{ secrets.REVIEW_APP_KEY }}
+      - name: Extract content of artifact
+        if: ${{ !inputs.pr-number }}
+        id: number
+        uses: Bullrich/extract-text-from-artifact@28b4a438a07226f4e4e19f625354bbe3e745a29e # v1.0.1
+        with:
+          artifact-name: pr_number
+      # DISABLED: Review bot requires pezkuwichain GitHub App
+      # - name: "Evaluates PR reviews and assigns reviewers"
+      #   uses: pezkuwichain/review-bot@9a5828019b78fcc2a7d851ca9797d810bcde95ea # v2.7.2
+      #   with:
+      #     repo-token: ${{ steps.app_token.outputs.token }}
+      #     team-token: ${{ steps.app_token.outputs.token }}
+      #     checks-token: ${{ steps.app_token.outputs.token }}
+      #     pr-number: ${{ inputs.pr-number || steps.number.outputs.content }}
+      #     request-reviewers: true
+      - name: "Review bot disabled"
+        run: echo "Review bot is disabled - requires pezkuwichain GitHub App"
+      - name: Log payload
+        if: ${{ failure() || runner.debug }}
+        run: echo "::debug::$payload"
+        env:
+          payload: ${{ toJson(github.event) }}