Fix getPageContext({ asyncHook: true }) returning different proxy than usePageContext()

[Copilot]

In production builds with streaming, getPageContext({ asyncHook: true }) was returning a different proxy object than usePageContext(), causing assertion failures in tests.

Root cause: The sync hook's globalObject.pageContext is cleared on the next microtask. When React renders asynchronously, the async hook fallback was creating a new proxy instead of returning the cached one.

Changes

• Store proxy in async store during hook execution (execHook.ts): The proxied pageContext is now stored in _asyncStore.pageContext when hooks execute, ensuring the same proxy is available later.

• Return cached proxy if available (getHttpRequestAsyncStore.ts): Check _isProxyObject before creating a new proxy; return the stored proxy directly if already proxied.

• Type-safe helper function: Extracted storeProxyInAsyncStore() with proper type guard to avoid duplication and as any casts.

// Test expectation that now passes
const pageContext = usePageContext()
const pageContext2 = getPageContext({ asyncHook: true })
assert(pageContext2 === pageContext) // ✓ Same object reference

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[Copilot]

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