Fix Sync Streams division by zero semantics

[sravan27]

Summary

This fixes a Sync Streams JavaScript evaluator divergence from SQLite around division by zero.

SQLite returns NULL for divide-by-zero expressions:

• 5 / 0
• 5 / 0.0
• 5 / '0'
• 0 / 0

The current JavaScript evaluator can instead return Infinity for real division by zero or throw for bigint division by zero. In filter expressions this can create evaluator errors or non-SQLite truthiness instead of SQLite's NULL result.

Changes

• Return null from the shared math operator implementation when the division RHS casts to zero.
• Add regression coverage for bigint, number, string-cast, negative, and zero-over-zero cases.
• Add a patch changeset for @powersync/service-sync-rules.

Verification

sqlite3 :memory: "select typeof(5/0), 5/0, typeof(5/0.0), 5/0.0, typeof(5/'0'), 5/'0';"
# null||null||null|

corepack pnpm --dir packages/sync-rules exec vitest test/src/sql_operators.test.ts --run
# 15 passed

corepack pnpm --dir packages/sync-rules exec vitest test/src/sql_functions.test.ts --run --testTimeout=10000
# 25 passed

corepack pnpm --dir packages/sync-rules run build:tsc
# passed

git diff --check
# passed

[changeset-bot]

🦋 Changeset detected

Latest commit: 421ae90

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

This PR includes changesets to release 16 packages

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

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