Refresh demo workflows for the current action release

[chrismaz11]

Summary

• update the retained demo workflow to reference the current v0.2.0 action tag
• remove the duplicate branch-specific demo workflow
• keep the repo automation aligned with the release documented in the README

Why

The repo README and package version are already on v0.2.0, but the demo workflows still referenced v0.1.0. There was also a second demo workflow tied to a one-off branch name, which duplicated the remaining manual demo path and added maintenance overhead.

Validation

• npm run validate:local

Security Review

• no new dependencies
• no runtime code changes
• workflow scope is reduced by removing a redundant trigger path

Risks / Follow-ups

• none beyond normal workflow review

[Copilot]

Pull request overview

This PR refreshes the repository’s demo GitHub Actions workflows to align with the currently documented TrustSignal action release (v0.2.0) and reduces maintenance overhead by removing a redundant workflow.

Changes:

• Remove the branch-specific demo workflow (trustsignal-demo.yml).
• Update the remaining demo workflow instructions to reference TrustSignal-dev/TrustSignal-Verify-Artifact@v0.2.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/trustsignal-demo.yml	Deletes the duplicate/branch-tied demo workflow to reduce workflow surface area and maintenance.
.github/workflows/demo.yml	Updates the printed example steps to reference the v0.2.0 action tag.

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