chore: API supports cli defaults

[Rockyy174]

fixes #4456.

[sourcery-ai]

Hey - I've left some high level feedback:

• In TurboConnect.InputDefaults.effective_default/2 you always prefer :external_default when present for external APIs, even if its value is nil, which will shadow a non-nil :default; consider treating a nil external_default as missing so the internal default still applies.
• The new CLI E2E step modules for documents/goals/projects/spaces/links share a lot of duplicated setup and assertion logic; consider extracting shared helpers (e.g., for auth+token setup and subscription_list assertions) to keep these tests easier to maintain.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In TurboConnect.InputDefaults.effective_default/2 you always prefer :external_default when present for external APIs, even if its value is nil, which will shadow a non-nil :default; consider treating a nil external_default as missing so the internal default still applies.
- The new CLI E2E step modules for documents/goals/projects/spaces/links share a lot of duplicated setup and assertion logic; consider extracting shared helpers (e.g., for auth+token setup and subscription_list assertions) to keep these tests easier to maintain.

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