Make offline upgrades lossless

[rdlabo]

What changed

• migrate released offline core schema v1 stores to v2 without discarding commands, retry state, optimistic images, companions, or integrity metadata
• add a prefetched authoritative change API that shares pull reconciliation and accepts repository-derived changes inside the same mutation transaction
• keep prefetched writes enabled for readCacheOnly while leaving background pull disabled and never advancing the pull cursor
• bulk-preload replica rows by source/partition for reconciliation and SQLite upserts, removing change- and command-count query N+1 behavior

Why

Applications upgrading from the released 21.5 command format must retain durable offline intent. Foreground HTTP responses also need the same authoritative ACK/conflict/rematerialization boundary as background pull without cursor races or product-level reconciliation copies.

Impact

Consumers can normalize legacy intent from the retained compatibility fields, and apply already-fetched server batches atomically through OfflineReplicaPullService.applyChanges(). Existing unknown core versions still fail closed.

Validation

• npx ng test kit --watch=false — 47 files / 870 tests passed
• npm run lint
• npm run prebuild:kit
• Prettier check and git diff --check

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