fix: No CI check that Push3 seeds transpile successfully before merge (#697)

Add seed-transpile-check CI step that loops over every *.push3 file in
tools/push3-evolution/seeds/, transpiles it via the Push3 transpiler,
and verifies the generated Solidity compiles with forge build. Fails
the build if any seed fails transpilation or compilation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.woodpecker/ci.yml

@@ -105,6 +105,46 @@ steps:
           npm test
         '
 
+  - name: seed-transpile-check
+    depends_on: [bootstrap-deps]
+    image: registry.niovi.voyage/harb/node-ci:latest
+    when:
+      - event: pull_request
+        path:
+          include:
+            - tools/push3-transpiler/**
+            - tools/push3-evolution/seeds/**
+    commands:
+      - |
+        bash -c '
+          set -euo pipefail
+          cd tools/push3-transpiler
+          npm install --silent
+          cd ../..
+          export PATH=/root/.foundry/bin:$PATH
+          failed=0
+          for seed in tools/push3-evolution/seeds/*.push3; do
+            name=$(basename "$seed")
+            echo "--- Transpiling $name ---"
+            if ! npx tsx tools/push3-transpiler/src/index.ts "$seed" onchain/src/OptimizerV3Push3.sol; then
+              echo "FAIL: $name failed to transpile" >&2
+              failed=1
+              continue
+            fi
+            echo "--- Compiling $name ---"
+            if ! (cd onchain && forge build --silent); then
+              echo "FAIL: $name transpiled but Solidity compilation failed" >&2
+              failed=1
+            fi
+          done
+          git checkout onchain/src/OptimizerV3Push3.sol
+          if [ "$failed" -ne 0 ]; then
+            echo "ERROR: One or more seeds failed transpile+compile check" >&2
+            exit 1
+          fi
+          echo "All seeds transpile and compile successfully."
+        '
+
   - name: single-package-manager
     depends_on: []
     image: registry.niovi.voyage/harb/node-ci:latest