`prepare_command` runs only on `pod install`. Mid-iteration Swift
edits to `darwin/Camera/*.swift` would never reach the built binary
until the user ran pod install or cleaned the Pods dir — confusing
during debugging (NSLog/diag additions silently absent from the
running app).
Add a `script_phases` build phase to both podspecs that rsyncs
darwin/Camera into Classes/Camera-shared before each compile. The
existing `prepare_command` stays as the install-time primer that
gives CocoaPods the initial file set to glob; the build phase keeps
contents fresh on every Swift edit thereafter. Verified: the resulting
binary now contains the NSLog strings that the prior build was
missing.
(Adding new files to darwin/Camera/ still requires pod install so
CocoaPods' source_files glob picks them up — script_phases only
refreshes content of files CocoaPods already knows about.)