[codex] Allow public templates in dashboard terminal

[matthewlouisbrockman]

What changed

• Allows owner/template references through the dashboard terminal template preflight.
• Keeps local/default template availability checks for bare template names.
• Adds unit coverage for public template reference detection.

Why

/sbx/new?template=owner/template worked because it calls Sandbox.create(template) directly. The dashboard terminal page rejected the same public template reference before launch because it only checked default templates and templates owned by the current team.

This made public workshop links like aiengineer-d56d/aiengineer-guide show as unavailable in the terminal UI even though the SDK could create them.

Validation

• bunx vitest run tests/unit/dashboard-terminal.test.ts
• bunx biome check 'src/app/dashboard/[teamSlug]/terminal/page.tsx' src/features/dashboard/terminal/template.ts tests/unit/dashboard-terminal.test.ts

[cursor]

PR Summary

Low Risk
Small change to template availability gating only; sandbox launch behavior is unchanged aside from fewer false “unavailable” states.

Overview
The dashboard terminal treated owner/template query params as unavailable because preflight only matched base, default templates, and the current team’s templates, while sandbox creation already accepted public references.

Adds isPublicTemplateReference (exactly one /, two segments) and skips the repository lookup for those refs in isTerminalTemplateAvailable. Bare names still go through the existing checks. Unit tests cover the detector.

^{Reviewed by Cursor Bugbot for commit bab3cf6. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[matthewlouisbrockman]

Closing and replacing this with the correctly named Linear-task branch: overly-restrictive-template-checks-on-dashboardtabterminal-eng-4352.