feat(offline): compose runtime capabilities

[rdlabo]

Summary

• add capability-based provideOffline composition for independent pull, outbox, and read-fallback use cases
• keep the existing ProvideOfflineOptions interface and legacy full-runtime configuration source-compatible
• make delete intent durable with effect: 'delete' and provide OfflineReplicaQueryService for consistent optimistic tombstone visibility
• validate pull change serverId metadata against the schema-declared serverId() value before persisting or advancing the cursor
• migrate existing native SQLite outbox tables additively with effect DEFAULT 'upsert'; older web/native commands remain upserts
• document the capability API, delete visibility, identity validation, and compatibility behavior

Why

Read-only products such as tipsys currently have to register an executor that always fails and a puller that returns no changes. Product request policies also duplicate pending-delete filtering, while pull identity checks differ between products. These are runtime invariants and optional capabilities that belong in the shared kit.

Compatibility

• existing provideOffline({ commandExecutor, replicaPuller, requestPolicies, ... }) callers retain the same behavior
• the public ProvideOfflineOptions remains an interface for consumers that extend it
• removeReplica remains supported for existing executors
• old commands without effect are interpreted as upsert
• SQLite adds the new column with a default and does not bump the destructive base storage schema version

Validation

• npx ng test kit --watch=false — 37 files / 507 tests passed
• npm run lint — all projects passed
• npm run test:offline-types:nonstrict — passed
• npm run prebuild:kit — passed
• git diff --check — passed

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