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c71e6e2c6a
Replaces the separate on_accesskit_update hook with a `&TreeUpdate` parameter on `after_step` — one hook per step, tree delivered inline. `step_no_side_effects` now returns the TreeUpdate so plugins driving the harness from within their own hook (where nested dispatches are suppressed) can still see it. Also adds `#[track_caller]` to the internal `_step` / `_step_no_side_effects` / `_try_run` so `Location::caller()` inside `step()` walks up to the user's original call site when reached via `run()`.