Bump submodules and version to 3.15.2

[ps2]

Brings in the five submodules with merged work and bumps the marketing version.

Submodules

submodule	from	to	what
OmnipodKit	4763ce6	366380d	eager connect watchdog for InPlay/iPhone-16 wedges, plus the O5 fresh-advert connect fix and the foreground-seed fix (#133)
LoopKit	c4a8f64	f0aa52a	survive a persistent store that fails to load (#606); fix infinite loop applying an override that ends on an entry boundary (#608); Xcode 27 fix (#605)
G7SensorKit	468eefc	fb87aa9	defer forgetting the sensor on a suspected session end (#63)
Loop	c4d89c0	3ab37d5	fix CarbMath preconditionFailure when a carb entry predates the ISF window (#2489)
LibreTransmitter	a38975d	c192a2f	add device manufacturer field (#41); make glucose smoothing configurable

LibreTransmitter was not on the original list for this bump — it had two commits waiting on its next-dev, so it is included here. Flagging it because the glucose smoothing change is behaviour-affecting and may want its own attention.

LibreLoop was already bumped separately in 3e74b97 (display-only forward throttle) and is unchanged here.

Two crash fixes worth calling out

LoopKit #608 fixes an infinite loop that presented as an allocation-failure crash while entering a manual glucose value. Reachable whenever an active override meets the manual bolus screen with no dose in flight — which a CGM outage long enough to outlast the last temp basal produces reliably.

LoopKit #606 stops a Core Data migration that loses a race with the widget extension from turning into a crash loop. Relevant to any release that changes the model, since that migration runs on first launch after upgrade.

Version

LOOP_MARKETING_VERSION  3.15.1 -> 3.15.2
CURRENT_PROJECT_VERSION 58     (unchanged)

Verification

Clean build of the LoopWorkspace scheme for generic/platform=iOS at each step, including after adding #605: BUILD SUCCEEDED, 19 plugins. Confirmed the version reached the built app rather than just the config file:

CFBundleShortVersionString  3.15.2
CFBundleVersion             58

Not installed to a device from this exact tree; the constituent changes have had device time individually.

[marionbarker]

Test

❌ does not build in current configuration with Xcode 27
❓ some submodules should have updated Localizable.xcstrings committed

Method

confirm this branch is compatible with Xcode 27, builds and uses the desired submodule SHA

• pull the bump/next-dev-3.15.2 locally and build using Xcode 27 beta 5
• the submodules highlighted in the table above are confirmed
• I got build failure because TrueTime.swift needs to be bumped to point to master (at least)
  • Right now master has 2 of 4 values of IPHONEOS_DEPLOYMENT_TARGET updated to 15.0 (Xcode 27), the others are still at 12.0
• After building, do any of the submodules have updates to the xcstrings files?
  • Yes - the following submodules need to have updated xcstrings added
  • This is not a blocker, but should be cleaned up:
    • LibreLoop
    • LibreTransmitter
    • Loop
    • OmnipodKit