docs: add exception handling toolchain compatibility guide

docs/develop/c/exception_handling.md

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+---
+sidebar_position: 6
+---
+
+# Exception Handling
+
+WasmEdge implements the [latest exception-handling proposal](https://github.com/WebAssembly/exception-handling) (post Oct 2023). Legacy EH instructions such as `delegate` are rejected at load time.
+
+Enable the proposal when running or compiling:
+
+```bash
+wasmedge --enable-exception-handling module.wasm
+wasmedge compile --enable-exception-handling module.wasm module.aot.wasm
+```
+
+## Toolchain compatibility
+
+| Toolchain | Compatible with WasmEdge EH | Notes |
+|-----------|----------------------------|-------|
+| Emscripten (`-fwasm-exceptions`) | No (as of 2026) | Often emits legacy EH (e.g. opcode `0x117` / `delegate`) |
+| C/C++ via wasi-sdk / clang | Check your LLVM version | Must emit the latest EH proposal, not legacy EH |
+| `wasm-3.0-exceptions` spec tests | Yes | Official test inputs used by WasmEdge |
+
+WasmEdge does not plan to support legacy EH. Use modules built for the current proposal only.
+
+## How WasmEdge tests EH
+
+CI runs the `wasm-3.0-exceptions` suite from [wasmedge-spectest](https://github.com/WasmEdge/wasmedge-spectest). See `test/spec/CMakeLists.txt` in the [WasmEdge](https://github.com/WasmEdge/WasmEdge) repository.
+
+To run a spec test locally after building tests, or fetch a `.wasm` from that repository:
+
+```bash
+wasmedge --enable-exception-handling path/to/test.wasm
+```
+
+## Emscripten repro (expected failure today)
+
+```bash
+emcc -O1 -fwasm-exceptions -sSTANDALONE_WASM a.cpp -o a.wasm
+wasmedge --enable-exception-handling a.wasm
+```
+
+Example `a.cpp` and more detail: [examples/exception_handling](https://github.com/WasmEdge/WasmEdge/tree/master/examples/exception_handling) in the WasmEdge repository.