WPB-26101 move code from KeyPackage into subsystem and store

[battermann]

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[Copilot]

Pull request overview

This PR refactors MLS key-package persistence/claiming logic out of Brig’s service-local Brig.Data.MLS.KeyPackage module into reusable wire-subsystems components, separating the Cassandra access layer (“store”) from the higher-level orchestration (“subsystem”). This aligns key-package handling with the broader subsystem architecture used across the monorepo.

Changes:

• Moved MLS key-package business logic into a new Wire.MlsKeyPackageSubsystem and its interpreter, and split Cassandra persistence into Wire.MlsKeyPackageStore + Cassandra interpreter.
• Updated Brig interpreters/effect stacks and API handlers to depend on the new subsystem/store effects instead of Brig-local data access.
• Removed the old Brig key-package data module and added a changelog entry documenting the extraction.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
services/brig/src/Brig/Data/MLS/KeyPackage.hs	Removed the previous Brig-local Cassandra + claim/count/delete implementation.
services/brig/src/Brig/CanonicalInterpreter.hs	Wired new MlsKeyPackageStore and MlsKeyPackageSubsystem interpreters into Brig’s interpreter stack.
services/brig/src/Brig/API/Public.hs	Added MlsKeyPackageSubsystem effect requirement to the public API effect constraints.
services/brig/src/Brig/API/MLS/KeyPackages/Validation.hs	Delegated lifetime validation to Wire.MlsKeyPackageSubsystem.validateKeyPackageLifetime.
services/brig/src/Brig/API/MLS/KeyPackages.hs	Switched key-package upload/claim/count/delete flows to use the new subsystem effect.
services/brig/src/Brig/API/Internal.hs	Updated internal MLS endpoints to use the new subsystem effect for key-package counting.
services/brig/src/Brig/API/Federation.hs	Updated federation MLS endpoints to require/use the new subsystem effect.
services/brig/brig.cabal	Dropped the removed Brig.Data.MLS.KeyPackage module from the Brig library.
libs/wire-subsystems/wire-subsystems.cabal	Added the new store/subsystem modules to wire-subsystems.
libs/wire-subsystems/src/Wire/MlsKeyPackageSubsystem/Interpreter.hs	New subsystem interpreter implementing claim/count/cleanup logic over the store effect.
libs/wire-subsystems/src/Wire/MlsKeyPackageSubsystem.hs	New subsystem effect definition plus shared lifetime validation function.
libs/wire-subsystems/src/Wire/MlsKeyPackageStore/Cassandra.hs	New Cassandra interpreter for key-package persistence queries.
libs/wire-subsystems/src/Wire/MlsKeyPackageStore.hs	New store effect definition for key-package persistence operations.
changelog.d/5-internal/WPB-26101	Changelog entry describing the extraction into subsystem + store.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.