[krisnye]

Summary

update(entity, { component: undefined }) removes a component at runtime. But under exactOptionalPropertyTypes, EntityUpdateValues<C> = Partial<Omit<C, "id">> only makes each key optional and rejects an explicit undefined. Removing a required component therefore needed a cast at the call site.

• EntityUpdateValues<C> now explicitly accepts undefined for each value: { [K in keyof Omit<C, "id">]?: C[K] | undefined }. The core store, public store, transactional store and transaction ops all use this type, so all of them are fixed.
• Additive: without exactOptionalPropertyTypes the type is identical to before. No runtime change.
• Regression guard: a new packages/data/type-tests/exact-optional project compiled with exactOptionalPropertyTypes, referenced from packages/data/tsconfig.json so tsc -b runs it. It checks only against the built .d.ts, so the rest of the package isn't held to the stricter flag. The test failed (TS2379) on the old type and passes on the new one, and a wrong value type is still rejected.
• Version bump to 0.10.29.

Test plan

• Clean pnpm -r run typecheck (tsbuildinfo cleared)
• pnpm run lint
• packages/data tests: 301 files / 3637 tests pass
• New type test proven red on the old type, green on the new one

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