fix: lazy load includes child collections in on-demand sync mode

[kevin-dp]

Summary

• Includes child collections now use lazy loading (matching the existing join optimization), so only rows matching parent correlation keys are loaded on-demand via requestSnapshot({ where: inArray(field, keys) })
• Previously, includes child collections loaded ALL data upfront because the correlation WHERE clause was consumed by the inner join and no filter was passed to the sync layer's loadSubset/queryFn
• Adds 6 new tests verifying the lazy loading behavior for includes

Fixes #1441

Test plan

• New tests in includes-lazy-loading.test.ts verify:
  • Correlation filter (inArray) is passed to child collection's loadSubset
  • Query results remain correct with lazy-loaded includes
  • Child source is marked lazy (no eager full load without filter)
  • Reactive loading when new parent rows arrive
  • Works with both toArray and Collection materialization
• All 112 existing includes tests pass
• Full test suite passes (2071 tests)
• Build passes

🤖 Generated with Claude Code

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commit: 04820ed

[github-actions]

Size Change: +488 B (+0.43%)

Total Size: 114 kB

📦 View Changed

Filename	Size	Change
packages/db/dist/esm/query/compiler/index.js	4.11 kB	+488 B (+13.46%)	⚠️

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packages/db/dist/esm/collection/change-events.js	1.39 kB
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packages/db/dist/esm/collection/transaction-metadata.js	144 B
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packages/db/dist/esm/indexes/reverse-index.js	538 B
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packages/db/dist/esm/optimistic-action.js	359 B
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packages/db/dist/esm/proxy.js	3.75 kB
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packages/db/dist/esm/query/ir.js	829 B
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packages/db/dist/esm/scheduler.js	1.3 kB
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packages/db/dist/esm/strategies/debounceStrategy.js	247 B
packages/db/dist/esm/strategies/queueStrategy.js	428 B
packages/db/dist/esm/strategies/throttleStrategy.js	246 B
packages/db/dist/esm/transactions.js	2.9 kB
packages/db/dist/esm/utils.js	927 B
packages/db/dist/esm/utils/array-utils.js	273 B
packages/db/dist/esm/utils/browser-polyfills.js	304 B
packages/db/dist/esm/utils/btree.js	5.61 kB
packages/db/dist/esm/utils/comparison.js	1.05 kB
packages/db/dist/esm/utils/cursor.js	457 B
packages/db/dist/esm/utils/index-optimization.js	1.54 kB
packages/db/dist/esm/utils/type-guards.js	157 B
packages/db/dist/esm/virtual-props.js	360 B

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[github-actions]

Size Change: 0 B

Total Size: 4.24 kB

ℹ️ View Unchanged

Filename	Size
packages/react-db/dist/esm/index.js	249 B
packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.32 kB
packages/react-db/dist/esm/useLiveQuery.js	1.34 kB
packages/react-db/dist/esm/useLiveQueryEffect.js	355 B
packages/react-db/dist/esm/useLiveSuspenseQuery.js	567 B
packages/react-db/dist/esm/usePacedMutations.js	401 B

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[samwillis]

LGTM