[WIP] Add helper for simulating console line arrival

[Copilot]

Implementation Plan: Teletype-Style Console Helper

• Explore existing console package and bubble tea integration
• Create teletype helper using bubble tea for smooth line-by-line rendering
• Add tests for the teletype helper
• Apply teletype helper to interactive commands (add_interactive.go, init.go)
• Test the implementation with console tests
• Fix linting issues
• Run full validation (make agent-finish)

Original prompt

Add a helper that allows simulating console line arriving at a constant speed like a teletype so that the user does not get a jarring screen update.

Apply helper to interactive commands like "new" or "add"

Prefer a bubble tea solution than low level timer based updates.

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