Add PredicateHolding Contract and add build process

[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.

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Note

Introduces a simple inheritance-based contract and strengthens artifact generation and publishing.

• New contract: PredicateHolding.sol (inheritance pattern) storing Predicate config with owner-managed setPolicyID/setRegistry; docs updated in src/examples/README.md.
• Workflow (release-artifacts.yml): determine workflow branch vs tag, checkout workflow branch to fetch script, cache script to /tmp, then checkout code at tag; use GH_TOKEN; simplify uploads with --clobber and stable asset paths (Contract/File), add stricter failure on zero uploads, and cleanup temp assets.
• Artifact extraction script (scripts/extract-artifacts.js): supports PredicateHolding and proxy contract, generates Standard JSON input and separate compiler settings for verification, writes compiler metadata once, records per-contract source metadata, handles inheritance output paths, logs bytecode hash, and prints an artifact summary.

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