Ensure hardhat demo bootstrap compiles artifacts and add regression test

[MontrealAI]

Motivation

• CI/demo runs failed at runtime when owner parameter matrix bootstrap attempted to deploy demo contracts without compiled Hardhat artifacts, producing zero/invalid addresses and causing demo workflows to error.
• The intent is to auto-bootstrap safe defaults for local/Hardhat/CI demo contexts while preserving strict validation for real networks.

Description

• Add ensureDemoArtifacts() to scripts/v2/lib/hardhatDemoBootstrap.ts which checks for required artifacts and runs Hardhat compile via run('compile') when artifacts are missing, and import artifacts and run from hardhat.
• Invoke the artifact check before deploying demo contracts so the demo bootstrap always produces non-zero addresses in local/CI contexts.
• Add a regression test test/demo/hardhatDemoBootstrap.test.ts that calls bootstrapHardhatDemoConfig('hardhat', ..., { force: true }) and asserts non-zero addresses are written into the generated address book and config overrides.
• No workflow YAML changes were required because the repository already contains an actionlint guardrail workflow to prevent YAML regressions.

Testing

• Ran ./scripts/ci/npm-ci.sh to install dependencies and the step completed successfully.
• Ran npm run owner:parameters -- --network hardhat --format json --out /tmp/owner.json and it completed with a generated demo address book containing non-zero addresses.
• Ran npx hardhat test test/demo/hardhatDemoBootstrap.test.ts and the new test passed (1 passing).

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Codex Task