feat(create): CLI improvements (name validation, flags, GitHub auth, agent-clean output)

[DylanPiercey]

A batch of create-CLI improvements:

• Name handling: validate the project name in the prompt and derive a valid npm package name from it (My App → my-app); quote cd paths that contain spaces.
• Agent/CI output: skip the animated clack spinner when output isn't a TTY (or under CI/agents) — it was spamming spinner frames into captured logs; use plain step lines instead.
• Hide legacy examples: the *-marko-5 examples no longer clutter the interactive browse list (still usable via --template <name>-marko-5).
• GitHub auth: send GITHUB_TOKEN/GH_TOKEN on the default-branch lookup and to giget (raises the 60/hr anon rate limit and enables private user/repo templates); distinguish rate-limit (403/429) from not-found (404).
• Surface failures: include the wrapped cause on download errors, and error on a missing/empty template instead of silently scaffolding an empty project.
• New flags: --no-install and --no-git. Templates without a package.json are handled gracefully (skip install).
• Tests: added unit tests for parseTemplate, toPackageName/isValidProjectName, detectInstaller/githubToken, and the new flags (20 total).

Verified end-to-end: plain agent output, name sanitization, --no-install/--no-git, missing-template error, and a full pnpm app scaffold (still approves esbuild, clean output).

[changeset-bot]

🦋 Changeset detected

Latest commit: 448543e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@marko/create	Minor
create-marko	Minor

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a7d8f9 and 448543e.

📒 Files selected for processing (9)

• .changeset/create-improvements.md
• packages/create/src/__tests__/env.test.ts
• packages/create/src/__tests__/name.test.ts
• packages/create/src/__tests__/parse.test.ts
• packages/create/src/__tests__/template.test.ts
• packages/create/src/cli.ts
• packages/create/src/create.ts
• packages/create/src/env.ts
• packages/create/src/name.ts

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• Create PR with unit tests
• Commit unit tests in branch dpiercey-ws-cli-create-n9kgdk

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