Manually QA interactive CLI workflows before v1

[lreading]

Summary

Manually exercise the interactive CLI flows before v1 to catch awkward prompts, confusing ordering, or rough edges that automated e2e tests may miss.

Suggested coverage:

• init from a blank project.
• init --from-example through interactive prompts.
• root interactive command selection for validate, build, fetch, and serve.
• GitHub token prompt behavior.
• Editing content while serve is running.

Alternatives considered

The existing e2e coverage is useful, but a short manual pass is still valuable for prompt wording and first-run usability.

Affected packages

• app (presentation renderer)
• cli (@slide-spec/cli)
• docs (documentation site)
• shared (types and validation)
• Unsure