[Incremental Reprocessing] Multiplexed sync configs

[rkistner]

This refactors HydratedSyncRules to support multiple SyncConfig instances. When multiple are passed in, we de-duplicate definitions. This currently requires the storage layer to assign unique ids/keys to each definition, which HydratedSyncRules then uses for de-duplication. That process will be implemented in a future PR - nothing uses multiple sync configs yet.

Why?

This will allow a replication stream/job to continue using HydratedSyncConfig as-is to process multiple SyncConfigs at a time, provided that the storage implementation constructs it correctly.

Further refactoring included

• Rename HydratedSyncRules -> HydratedSyncConfig.
• Include key in BucketDataScope and ParameterLookupScope.
• Split out ParameterLookupDefinitionId as a subset of ParameterLookupScope, excluding source and the new key, to avoid the storage details leaking into the sync config parsing.

AI usage

Used Codex gpt-5.5 for planning and implementation, manually guided and reviewed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3276000

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@powersync/service-sync-rules	Minor
@powersync/service-module-postgres-storage	Patch
@powersync/service-module-mongodb-storage	Patch
@powersync/service-module-postgres	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-core	Patch
@powersync/service-module-mssql	Patch
@powersync/service-module-mysql	Patch
@powersync/service-jpgwire	Patch
@powersync/service-core-tests	Patch
@powersync/lib-services-framework	Patch
@powersync/service-schema	Patch
@powersync/service-image	Patch
@powersync/service-module-core	Patch
test-client	Patch
@powersync/lib-service-postgres	Patch
@powersync/service-rsocket-router	Patch
@powersync/lib-service-mongodb	Patch

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[simolus3]

These changes make sense to me after our offline discussion 👍 I have a few minor questions.