Second Phase 1D cluster. NSBundle.mainBundle.resourcePath chain now
dispatches through `#objc_call(*void)` instead of a shared `msg_o`
typed cast — covers both class-method (`+mainBundle`) and
instance-method (`-resourcePath`) shapes through one intrinsic. Net
-3 lines.
iOS-sim chess regression smoke: app launches with all piece assets
rendered, which is the visible signal that `chdir` to the bundle's
resource path still succeeds.
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