[ronniegeraghty]

Summary

Closes #8.

Rewrite only the README Requirements section as the approved shared checklist for marketplace development and evals:

• One supported Copilot harness and a GitHub Copilot plan.
• Node.js 24+ and npm, Copilot CLI 1.0.85+, Vally (@microsoft/vally-cli) 0.19.0+, and Git 2.28.0+.

Use the requested introduction, “For marketplace development and evals, use this shared setup.” Preserve the local-install validator link and remove the redundant installed-plugin disclaimer, upstream runner note, and opt-in reminder from Requirements. The existing Use the marketplace section already covers installation and remains unchanged. Minima follow the starter-pinned upstream runner requirements.

Verified provisioning: .github/copilot/settings.json enables only marketplace-maintainer and plugin-authoring after checkout trust in supported hosts. marketplace.json lists the remote Evals plugin but does not enable it. Evals still requires explicit installation/enablement; npm development dependencies supply Copilot CLI and Vally, not the Evals plugin. No lifecycle script or tracked hook provisions Evals.

No dependency, runtime, manifest, or settings changes; all README content outside Requirements is unchanged.

Validation

• git diff --check — passed.
• Focused documentation assertions on the revised candidate — passed: exact requested introduction and paragraph removal, all five prerequisites unchanged, and no edits outside Requirements.
• Provisioning assertions — passed: only the two maintenance plugins are enabled in checkout settings; Evals is catalog-only, with no npm lifecycle or tracked hook installer.
• Initial npm run lint passed on the first revision in a clean tracked-files snapshot using existing dependencies: 6 skills and 7 eval specs passed. In-place lint was blocked by an obsolete empty plugin directory held open by another process; that process was left untouched and the snapshot was removed. Lint was not rerun for this prose-only follow-up.
• Paid evals were not run.

[Copilot]

🟢 Approval recommended

The reviewed README update preserves installation and host guidance while documenting the relevant development and evaluation prerequisites, with no active review issues identified.

No open issues 🎉

What changed in this PR

Updates the README Requirements section with a shared checklist for marketplace development and CLI-based evals while preserving installation guidance, host-specific references, and opt-in Evals behavior.

Changes:

• Documents supported Copilot harnesses, GitHub Copilot plan, Node.js/npm, Copilot CLI, Vally, and Git minimums.
• Clarifies that installed plugins do not require the full development setup.
• Retains local-install and upstream runner links.

File	Description
README.md	Rewrites the Requirements section with the approved development and eval prerequisites and clarifies installation scope.

_{Review effort: Lite (auto)}