feat: support Deno workspace configurations in readWorkspacePatterns

[WolfieLeader]

Description

readWorkspacePatterns() currently only checks pnpm-workspace.yaml and package.json workspaces. Deno monorepos that use deno.json or deno.jsonc with a workspace array field are completely undetected.

This means Deno workspace monorepos fall back to single-package behavior for setup, validate, and workflow generation.

Additional Considerations

• deno.jsonc uses JSONC format (supports comments and trailing commas) which requires a sanitizer before JSON.parse
• The workspace field in Deno config uses the same glob pattern format as npm/pnpm workspaces