refactor(ci): decouple from upstream Parity infrastructure

Replace Parity-specific infrastructure dependencies with Pezkuwi's own:
- S3 release uploads → GitHub Releases (gh CLI)
- parity-zombienet runner labels → pezkuwi-runner
- Grafana/Loki log URLs → disabled (use GH artifacts)
- Matrix notifications → disabled (pending Pezkuwi Matrix)
- paritytech issue links → pezkuwi tracking issues
- paritytech Docker image refs → pezkuwi-sdk-frame in cmd.py
- Add mirror-ci-image.yml workflow for GHCR image mirroring
- Document upstream shared tools (resolc, try-runtime, evm-test-suite)

.github/workflows/check-runtime-migration.yml

@@ -85,6 +85,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Download CLI
+        # NOTE: try-runtime-cli is an upstream shared tool from paritytech/try-runtime-cli
         run: |
           curl -sL https://github.com/paritytech/try-runtime-cli/releases/download/v0.8.0/try-runtime-x86_64-unknown-linux-musl -o try-runtime
           chmod +x ./try-runtime

.github/workflows/mirror-ci-image.yml

@@ -0,0 +1,41 @@
+# Mirror upstream CI image to GHCR so we control our own build infrastructure.
+# Runs manually or when .github/env changes (new CI image version).
+name: Mirror CI Image
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths: [".github/env"]
+
+permissions:
+  packages: write
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Read source image from env file
+        id: source
+        run: |
+          SOURCE_IMAGE=$(grep '^IMAGE=' .github/env | cut -d'"' -f2)
+          TAG=$(echo "$SOURCE_IMAGE" | cut -d: -f2)
+          echo "source=$SOURCE_IMAGE" >> "$GITHUB_OUTPUT"
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
+          echo "Source: $SOURCE_IMAGE"
+
+      - name: Log in to GHCR
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3.7.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Pull, tag, and push to GHCR
+        run: |
+          docker pull "${{ steps.source.outputs.source }}"
+          docker tag "${{ steps.source.outputs.source }}" "ghcr.io/pezkuwichain/ci-unified:${{ steps.source.outputs.tag }}"
+          docker push "ghcr.io/pezkuwichain/ci-unified:${{ steps.source.outputs.tag }}"
+          echo "Mirrored to ghcr.io/pezkuwichain/ci-unified:${{ steps.source.outputs.tag }}"

.github/workflows/release-reusable-rc-build.yml

@@ -205,6 +205,7 @@ jobs:
          run: brew install solidity
 
        - name: Install resolc
+         # NOTE: resolc is an upstream shared tool from paritytech/revive (EVM compiler)
          run: |
             VERSION="0.3.0"
             ASSET_URL="https://github.com/paritytech/revive/releases/download/v$VERSION/resolc-universal-apple-darwin"

.github/workflows/tests-evm.yml

@@ -34,6 +34,7 @@ jobs:
       - name: Update the Installed Python
         run: apt-get update && apt-get install -y python3-pip python3
       - name: Installing the Latest Resolc
+        # NOTE: resolc is an upstream shared tool from paritytech/revive (EVM compiler)
         run: |
           VERSION="0.5.0"
           ASSET_URL="https://github.com/paritytech/revive/releases/download/v$VERSION/resolc-x86_64-unknown-linux-musl"
@@ -119,6 +120,7 @@ jobs:
           cargo build --locked --release -p pez-revive-dev-node --bin pez-revive-dev-node
 
       - name: Checkout evm-tests
+        # NOTE: evm-test-suite is an upstream shared test suite from paritytech
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           repository: paritytech/evm-test-suite

.github/workflows/tests-misc.yml

@@ -472,6 +472,7 @@ jobs:
           solc-select use 0.8.30
           solc --version
       - name: Install resolc
+        # NOTE: resolc is an upstream shared tool from paritytech/revive (EVM compiler)
         run: |
           source $HOME/.cargo/env
           VERSION="0.5.0"