chore: Merge from Main 3-25-26

[BrandonStalnaker]

Background

• Workstation/9.0-Release needs kept up to date with all the changes to Main

What Has Changed

• Merge commit from Main to this branch

Screenshots/Video

• {Include any screenshots or video demonstrating the new feature or fix, if applicable}

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://go/j/[ticket-number]

[cursor]

PR Summary

Medium Risk
Touches core session/background processing, kit registry locking, and request-signing logic; while changes are defensive and test-covered, they affect concurrency-sensitive code paths that could impact background uploads or kit activation.

Overview
Bumps the SDK to 8.44.3 (Info.plist, podspec, constants) and updates the changelog/release manifest with 8.44.1–8.44.3 entries.

Hardens several concurrency-sensitive paths: serializes updateLastUseDate onto the SDK message queue when entering background, makes MPBackendController’s background-time loop read backgroundTimeRemaining and cancellation state together on the main thread, and adds semaphore-locked access for MPKitContainer’s activeKitsRegistry.

Adds defensive request-building behavior by rejecting overly long config/audience queries (max 8192) and building signature strings without stringWithFormat to avoid nil-related issues; updates MPSession properties to atomic and expands unit test coverage around these race conditions and edge cases.

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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	1.65 MB	1.66 MB	+16 KB
Executable Impact	896 bytes	896 bytes	+N/A
XCFramework Size	5.45 MB	5.47 MB	+20 KB

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (workstation/9.0-Release):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1772,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1688,"sdk_executable_impact_bytes":896,"xcframework_size_kb":5584}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1788,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1704,"sdk_executable_impact_bytes":896,"xcframework_size_kb":5604}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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