Add PredicateHolding Contract

[penDerGraft]

Adds a new contract to the inheritance examples called PredicateHolding. This is for initial integration with the Predicate API when a full onchain integration is either not ready or not feasible.

This PR also fixes a few bugs in the release workflow.

---

Note

Improves the release workflow to fetch and use the extraction script from the workflow branch, validates/creates releases, uploads structured assets, and extends the extractor to include compiler metadata and additional contracts.

• CI Workflow (.github/workflows/release-artifacts.yml):
  • Determine both tag and workflow_ref; checkout workflow branch to fetch the script, then checkout code at the tag.
  • Run extractor from a temp location; fail if missing.
  • Use GH_TOKEN and gh to validate tag, create release if needed, and verify existence before upload.
  • Upload artifacts with structured names by copying to a temp directory; use --clobber, clean up temps, and fail if none uploaded.
• Artifact Extraction (scripts/extract-artifacts.js):
  • Add TransparentUpgradeableProxy; handle MetaCoin from out/inheritance/MetaCoin.sol/.
  • Extract compiler metadata once into artifacts/compiler-metadata.json.
  • Continue extracting ABI/bytecode/deployed bytecode; emit sorted contract list and artifact summary.

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