refactor(remote-config): manifest persistence, request body handling

[tonidero]

Description

This PR is part of the stack to support the new Remote configuration endpoint.

In this PR, we add support to cache the Manifest in the remote config response, and then post it back in the request so the backend can decide what needs updating.

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Note

Medium Risk
Changes the remote config network contract and adds on-disk state that must stay consistent with server diffs; impact is limited while RemoteConfigManager is not yet wired into SDK lifecycle.

Overview
Adds manifest replay for /v2/config: Backend.getRemoteConfig now takes a RemoteConfiguration.Manifest, serializes it into a { "manifest": … } request body (instead of null), and treats HTTP 204 as “no change” via a null RCContainer callback.

Introduces RemoteConfigDiskCache to persist the last manifest plus merged topic bodies under noBackupFilesDir/RevenueCat/, and RemoteConfigManager to read that cache, send the persisted manifest (or a default app domain on first run), merge/prune topics on 200, and skip writes on 204, errors, or parse failures. RemoteConfiguration.parse(ByteBuffer) duplicates the buffer so RC container views are not consumed.

Lifecycle wiring and blob/topic handlers are not hooked up yet; this PR is the persistence + request/response handling layer, with expanded backend and unit tests.

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[tonidero]

• refactor(remote-config): topic-handler registry (generic dispatch) #3621
• refactor(remote-config): inline blob store + extraction #3615
• refactor(remote-config): manifest persistence, request body handling #3612 👈 (View in Graphite)
• refactor(remote-config): wire-format models #3610
• refactor(remote-config): Trusted-entitlements signing for the binary remote config response #3601
• refactor(remote-config): Support RC Container Format for remote config request, remove stale implementation temporarily #3607
• refactor(remote-config): RC Container Format v1 support #3534
• main

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[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.25%. Comparing base (b6031a0) to head (0c7d740).

Files with missing lines	Patch %	Lines
...hases/common/remoteconfig/RemoteConfigDiskCache.kt	66.66%	9 Missing and 3 partials ⚠️
.../kotlin/com/revenuecat/purchases/common/Backend.kt	40.00%	5 Missing and 1 partial ⚠️
...rchases/common/remoteconfig/RemoteConfigManager.kt	90.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@                                                  Coverage Diff                                                   @@
##           06-16-phase_1__v2_config_wire-format_models_remove_stale_remote-config_scaffolding    #3612      +/-   ##
======================================================================================================================
- Coverage                                                                               80.25%   80.25%   -0.01%     
======================================================================================================================
  Files                                                                                     379      381       +2     
  Lines                                                                                   15530    15599      +69     
  Branches                                                                                 2163     2172       +9     
======================================================================================================================
+ Hits                                                                                    12464    12519      +55     
- Misses                                                                                   2202     2209       +7     
- Partials                                                                                  864      871       +7     

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[emerge-tools]

📸 Snapshot Test

593 unchanged

Name	Added	Removed	Modified	Renamed	Unchanged	Errored	Approval
TestPurchasesUIAndroidCompatibility com.revenuecat.testpurchasesuiandroidcompatibility	0	0	0	0	335	0	N/A
TestPurchasesUIAndroidCompatibility Paparazzi com.revenuecat.testpurchasesuiandroidcompatibility.paparazzi	0	0	0	0	258	0	N/A

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[tonidero]

This is for now just in progress. This is not actually resolving the topics or anything, just assuming they are all already resolved.

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[tonidero]

Moving back to draft since I'm still missing some things sorry for the noise!

[tonidero]

This PR might need to change to make the manifest a client-abstracted format instead of what we do right now, but we can iterate on this after I would say.