🧹 Remove unwrap usage in web.rs standard library

[Tcode-Motion]

🎯 What: Replaced the fragile unwrap() calls on tiny_http::Server::http(...) in the start and serve functions of web.rs with proper match statements that return a RuntimeError upon failure. We also explicitly replaced .unwrap() on hardcoded, infallible header parsing with .expect("valid header").
💡 Why: This improves maintainability and robustness. Unwrapping the server creation meant that if a port was already in use, the entire runtime would crash with a panic. By returning a RuntimeError, TechScript code can handle the failure gracefully. Additionally, we ensure SERVER_RUNNING is correctly reset to false in the error path to avoid poisoning global state.
✅ Verification: Ran cargo test --workspace --all-targets and verified all tests pass, including updated tests in stdlib_tests.rs that now check for RuntimeErrors instead of panics when attempting to bind to an in-use port.
✨ Result: The web server standard library functions are now safer, more reliable, and correctly propagate errors back to the caller instead of crashing the interpreter.

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PR created automatically by Jules for task 6372023742653441678 started by @Tcode-Motion

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