refactor: Move MPRokt Swift interop to core SDK for single-import

[thomson-t]

Summary

• Move MPRokt Swift bridge extensions from the Rokt Kit (mParticle-Rokt-Swift target) into the core SDK (mParticle_Apple_SDK target) so import mParticle_Apple_SDK alone provides all MPRokt APIs in Swift
• Delete MPRokt+SwiftInterop.swift from the Kit — no longer needed since the bridge lives in the core SDK
• Restore original method names (events instead of subscribeToPlacementEvents) — no API rename needed
• Update MIGRATING.md to reflect single-import experience
• Update example apps to demonstrate the single-import pattern
• Point Kit Package.swift to main branch

Motivation

After the 9.0 merge, Swift callers needed two imports (import mParticle_Apple_SDK + import mParticle_Rokt_Swift) to access MPRokt methods that use RoktContracts types (RoktEvent, RoktConfig, etc.). This happened because MPRokt.h forward-declares these types, and Swift's ObjC importer can't resolve forward-declared types from another module.

The core SDK already @_exported imports both mParticle_Apple_SDK_ObjC and RoktContracts, so placing the Swift bridge extension there gives Swift consumers access to all MPRokt APIs with a single import. ObjC consumers are unaffected — the Swift extension methods are not @objc and don't interfere with the ObjC method dispatch.

Test plan

• xcodebuild build for iOS Simulator passes with MPRokt+Swift.swift in the core SDK target
• trunk check passes on all modified files
• Build the Rokt Kit package to confirm it compiles without MPRokt+SwiftInterop.swift
• Verify SPM-Swift-Example builds and import mParticle_Apple_SDK alone provides selectPlacements, events, globalEvents, registerPaymentExtension, selectShoppableAds
• Run ObjC and Swift unit test suites

[cursor]

PR Summary

Medium Risk
Medium risk because it changes how MPRokt APIs are surfaced to Swift (new bridging extensions and restored method names), which could impact compilation/behavior for existing Swift integrations if the selector bridging is incorrect.

Overview
Moves the Swift bridging for MPRokt into the core SDK by adding MParticle/Sources/mParticle_Apple_SDK/MPRokt+Swift.swift, so Swift callers can access selectPlacements, events, globalEvents, registerPaymentExtension, and selectShoppableAds via import mParticle_Apple_SDK.

Removes the kit-side Swift interop source from the Rokt kit project and updates migration docs and examples to use the original events naming (dropping the Swift-only subscribeToPlacementEvents workaround) and demonstrate event logging for overlay/bottomsheet placements.

Updates the Rokt kit Package.swift to track the mParticle Apple SDK main branch, and adjusts the SPM example Xcode projects’ package/product dependencies accordingly.

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[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.75 MB	1.75 MB	+N/A
Executable Impact	896 bytes	896 bytes	+N/A
XCFramework Size	6.38 MB	6.38 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (main):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":896,"xcframework_size_kb":6532}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":896,"xcframework_size_kb":6532}

[nickolas-dimitrakas]

We shouldn't need these imports here as they are already visible from mParticleAppleSDKExports.swift