refactor: remove try/catch from event dispatch and IOCP completion handlers

[Copilot]

The codebase follows a no-exception convention — handlers communicate errors via return values and LMNET_LOG*, never by throwing. The try/catch blocks in the event reactor dispatch paths and the IOCP worker thread were dead code that added noise and inconsistency.

Changes

• src/platforms/darwin/event_reactor.cpp — removed try/catch wrapper around DispatchEvent() in the kqueue run loop
• src/platforms/linux/epoll/event_reactor.cpp — removed try/catch wrapper inside DispatchEvent() around the four handler calls
• src/platforms/windows/iocp_manager.cpp — removed try/catch wrapper around HandleCompletion() in the IOCP worker thread; recycleRequest is now assigned directly from the return value

// Before
bool recycleRequest = true;
try {
    recycleRequest = HandleCompletion(req, bytes, error);
} catch (const std::exception &e) {
    LMNET_LOGE("Exception in IOCP completion handler: %s", e.what());
} catch (...) {
    LMNET_LOGE("Unknown exception in IOCP completion handler");
}

// After
bool recycleRequest = HandleCompletion(req, bytes, error);

[Copilot]

Pull request overview

This PR removes try/catch wrappers from the platform-specific event dispatch paths (kqueue/epoll) and the Windows IOCP worker loop to align reactor/IO completion handling with the project’s stated no-exceptions convention.

Changes:

• Removed try/catch around kqueue dispatch in the Darwin reactor run loop.
• Removed try/catch around handler invocations in the Linux epoll DispatchEvent() path.
• Removed try/catch around HandleCompletion() in the Windows IOCP worker thread and assigns recycleRequest directly from the return value.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/platforms/darwin/event_reactor.cpp	Removes exception wrapper around kqueue event dispatch.
src/platforms/linux/epoll/event_reactor.cpp	Removes exception wrapper around epoll handler calls in DispatchEvent().
src/platforms/windows/iocp_manager.cpp	Removes exception wrapper around IOCP completion handling in the worker loop.

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