chore: prepare product capture v0.1.8

[intel352]

Summary

• bump plugin manifest and download URLs to v0.1.8
• use wfctl v0.74.3 in the release workflow

Verification

• jq -e '.version == "0.1.8" and ([.downloads[].url | contains("/v0.1.8/")] | all)' plugin.json
• GOWORK=off go test ./... -count=1
• git diff --check

[Copilot]

Pull request overview

Prepares the product-capture plugin for the v0.1.8 release by updating the published manifest metadata and aligning the release workflow tooling to the intended wfctl version.

Changes:

• Bumped plugin.json version to 0.1.8.
• Updated all plugin download URLs in plugin.json to point at the v0.1.8 GitHub release assets.
• Updated the release workflow to install and use wfctl v0.74.3.

Reviewed changes

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

File	Description
plugin.json	Bumps manifest version and retargets all download URLs to v0.1.8 assets.
.github/workflows/release.yml	Updates the installed wfctl version used for contract validation and capability verification in the release pipeline.

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