Remove unnecessary type parameters from persistence interfaces

[kevin-dp]

Summary

• Removes generic type parameters (<T, TKey>) from PersistedCollectionPersistence, PersistenceAdapter, and SQLiteCorePersistenceAdapter — all implementations already erased these to Record<string, unknown> / string | number internally
• Collection-level typing (T, TKey) is fully preserved — it flows from getKey, schema, and other CollectionConfig fields, not from the persistence layer
• Removes ~300 lines of unnecessary generic plumbing and as unknown as casts across all platform persistence packages

Test plan

• All 51 core persistence tests pass
• TypeScript type-checks clean across all persistence packages (core, browser, node, electron, cloudflare)
• Type-test file (persisted.test-d.ts) confirms end-user collection typing is preserved
• ESLint passes (pre-commit hook)

🤖 Generated with Claude Code

[pkg-pr-new]

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commit: 4637e2f

[samwillis]

LGTM, just need a changeset.