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## Summary
- Require iOS 27.0 across the iOS apps, extensions, package products,
and test bundles. The macOS minimum stays at 26.0.
- Remove the iOS 26.1 tab-accessory availability branch and inline the
accessory in `MainTabs`.
- Update requirements and snapshot guidance. Native-glass settle floors
remain because the iOS 27 snapshot suite still depends on them.
## Why
The supported iOS runtime is now 27.0. The old deployment minimum kept
an unreachable iOS 26.0 presentation path and prevented the follow-on
SwiftData HistoryObserver migration.
## Compatibility
Devices on iOS 26 cannot install this app version. Persistence, CloudKit
schema, and backup formats do not change. `Package.swift` uses
`.iOS("27.0")` because the manifest's Swift tools version 6.2 does not
provide the `.v27` shorthand.
## Review focus
- The native tab accessory renders through the same existing status view
on iOS 27.
- Snapshot settling and the iOS 27 tile-and-stitch workaround remain in
place.
## Testing
- `./ide --no-open` — passed.
- `./swiftformat --lint` — passed.
- `BUMPER_EVALUATION_TIMEOUT_SECONDS=300 ./test --architecture-only` —
passed; the default 60-second budget timed out on the initial run.
- `./test --everything --skip-architecture` — 2,023 iOS unit tests and
50 snapshot suites passed.
- `mise exec -- tuist test Ledger-macOS-Tests --no-selective-testing --
-destination 'platform=macOS'` — passed.
## Stack
Base PR. [PR #319](#319) migrates
WhereCore to HistoryObserver on top of this minimum-version change.
Replace the Core Data remote-change notification bridge with a SwiftData HistoryObserver while preserving the external-author classifier, startup catch-up, coalescing, and store change streams. Exercise the production source with temporary on-disk containers and update its module contracts.
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Summary
HistoryObserver.changes()andremoteChanges()streams, author classification, event coalescing, startup catch-up, and logged failure behavior.Design decisions
HistoryObserveris scoped to Where'sModelContainer, so an unrelated Periscope store cannot trigger a Where refresh. Itsauthorsparameter only includes named authors; it cannot exclude the current store instance's author while accepting arbitrary CloudKit and sibling-process authors. The history classifier therefore remains responsible for suppressing local writes.The source observes
eventCounterthroughObservations. It compares the first emitted value with the counter captured during setup, then checks history once after registration to cover a transaction committed between the baseline and observation startup.Review focus
Testing
./ide --no-openand./swiftformat --lint— passed.StoreRemoteChangeSourceTests— 6 tests passed.BUMPER_EVALUATION_TIMEOUT_SECONDS=300 ./test --architecture-only— passed../test --everything --skip-architecture— 2,029 iOS unit tests and 50 snapshot suites passed.mise exec -- tuist test Ledger-macOS-Tests --no-selective-testing -- -destination 'platform=macOS'— passed.Stack
Second PR, based on PR #318. The iOS 27 minimum in that PR makes
HistoryObserveravailable to WhereCore.