Make recording export quality configurable

[thymikee]

What to build

Expose and document the recording export quality tradeoff used by iOS recording post-processing. The current medium-quality export is useful for fast simulator demos, but teams may need a higher-quality option for evidence, release notes, or debugging visual artifacts.

The default should stay optimized for speed unless there is a strong reason to change it.

Acceptance criteria

• Recording export quality can be selected through a command option or documented config path.
• The default preserves the current fast export behavior.
• A higher-quality mode is available and wired through the same recording stop/export path.
• Help or docs explain the speed versus quality tradeoff in user-facing language.
• Tests cover option parsing and the Swift export preset selection without requiring live simulator recording.

Blocked by

None - can start immediately