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realtime: MarketDepthBuilder + SmartDepth replaces market_depth(bool) (#619)

* realtime: MarketDepthBuilder + SmartDepth replaces market_depth(bool)

3-arg `market_depth(&contract, num_rows, is_smart_depth)` collapses into
`MarketDepthBuilder` with `.smart_depth(SmartDepth)` setter (default `No`)
and `.subscribe()` terminal. `is_smart_depth: bool` is now typed
`SmartDepth { Yes, No }` at `market_data::SmartDepth`, mirroring
`IgnoreSize`.

Final builder in the realtime sweep (plans/realtime-builders.md PR 3).
Prelude adds `MarketDepthBuilder` + `SmartDepth`. Migration §29.

* simplify: drop SmartDepth::is_enabled(); inline matches!() (IgnoreSize parity)

/simplify lens: `IgnoreSize` precedent inlines `matches!(..., Yes)` at
each call site rather than carrying a public predicate method. Mirror
that, drop the corresponding unit test, and consume `SmartDepth::default()`
inside `MarketDepthBuilder::new()` so the `#[derive(Default)]` is
load-bearing. Drop a redundant comment from the async example.

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