asyncio and native threads timeout handling fix

[parfeon]

fix(asyncio): fix error propagation in async request path

Ensure PubNubAsyncioException always carries a valid PNStatus with error data instead of None.

fix(asyncio): fix PubNubAsyncioException.__str__ crash

Handle cases where status or error_data is None instead of raising AttributeError.

fix(event-engine): fix error type checks in effects

Match PubNubAsyncioException which is what request_future actually returns on failure.

fix(event-engine): fix give-up logic for unlimited retries

Handle -1 (unlimited) correctly since attempts > -1 was always true, causing immediate give-up.

fix(event-engine): initialize heartbeat max retry attempts

Use delay class defaults instead of config value which could be None causing TypeError on comparison.

fix(event-engine): add missing return after heartbeat give-up

Prevent falling through to start a heartbeat after deciding to give up.

fix(request-handlers): use explicit httpx.Timeout object

Set all four timeout fields explicitly instead of a 2-tuple that left write and pool unset.

fix(request-handlers): enforce wall-clock deadline to survive system sleep

On macOS and Linux, time.monotonic() does not advance during system sleep, causing socket and asyncio timeouts (310s subscribe) to stall for hours of wall-clock time. Add time.time()-based deadline checks that detect sleep and cancel stale requests within ~5s of wake.

fix(asyncio): replace asyncio.wait_for with wall-clock-aware loop

Use asyncio.wait() with periodic time.time() checks instead of a single monotonic-based wait_for(), yielding to the event loop between checks.

fix(native-threads): add WallClockDeadlineWatchdog

Persistent single daemon thread monitors time.time() every 5s and closes the httpx session when the wall-clock deadline passes, interrupting the blocking socket read. Tracks deadlines per calling thread so concurrent requests (e.g., subscribe + publish) don't interfere. Only armed for long-timeout requests (>30s). Session is recreated for subsequent requests

test(wall-clock-deadline): add unit tests for sleep detection

Cover both asyncio and threads paths: simulated clock jumps, normal passthrough, clean watchdog shutdown, per-thread deadline isolation, concurrent request independence, cleanup, and exception propagation.

test(native-threads): add try/finally cleanup to subscribe tests

Ensure pubnub.stop() always runs to prevent non-daemon threads from blocking process exit.

test(native-threads): fix flaky where_now and here_now tests

Enable presence heartbeat and use unique channel names so presence registers on the server.

test(file-upload): fix shared state leak in file upload tests

Restore cipher_key after use in send_file and pass it explicitly to download_file.

test(message-actions): use unique channel names

Avoid collisions with stale data from prior test runs.

[pubnub-ops-terraform]

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