chore: add build output policy and disable coro routes temporarily

- Add .cursor/rules/build-outputs.mdc to enforce .temp/ directory for all build artifacts
- Disable coroutine route handlers in example server with #if 0 (was #ifdef BOOST_BEAST2_HAS_CORO)

Author: vinniefalco

.cursor/rules/build-outputs.mdc

@@ -0,0 +1,50 @@
+---
+description: Build outputs must go in .temp directory
+globs:
+alwaysApply: true
+---
+
+# Build Output Directory Policy
+
+**All build artifacts, intermediate files, and temporary outputs MUST go in the `.temp/` directory.**
+
+## Required Directory Structure
+
+- `.temp/build-msvc/` - MSVC/Visual Studio builds
+- `.temp/build-gcc/` - GCC builds (via MSYS2)
+- `.temp/build-clang/` - Clang builds
+- `.temp/build-ninja/` - Ninja builds
+- `.temp/` - Any other temporary or generated files
+
+## Rules
+
+1. **Never create executables, object files, or build artifacts in source directories**
+2. **Never commit anything from `.temp/`** - it is in `.gitignore`
+3. When configuring CMake, always use `-B .temp/build-<compiler>`
+4. When running direct compiler commands, output to `.temp/build-<compiler>/`
+
+## Example Commands
+
+### CMake (MSVC)
+```powershell
+cmake -B .temp/build-msvc -G "Visual Studio 18 2026" -A x64
+cmake --build .temp/build-msvc --config Release
+```
+
+### CMake (GCC via MSYS2)
+```bash
+cmake -B .temp/build-gcc -G "Unix Makefiles"
+cmake --build .temp/build-gcc
+```
+
+### Direct GCC compilation
+```bash
+mkdir -p .temp/build-gcc
+g++ -std=c++20 -O3 src/main.cpp -o .temp/build-gcc/main.exe
+```
+
+### Direct MSVC compilation
+```powershell
+New-Item -ItemType Directory -Force -Path .temp/build-msvc
+cl /std:c++20 /O2 src/main.cpp /Fe:.temp/build-msvc/main.exe
+```

example/server/main.cpp

@@ -124,7 +124,7 @@ struct do_json_rpc
 
 };
 
-#ifdef BOOST_BEAST2_HAS_CORO
+#if 0
 auto
 my_coro(
     http::route_params& rp) ->
@@ -193,7 +193,7 @@ int server_main( int argc, char* argv[] )
             http::cors(opts),
             do_json_rpc()
         );
-#ifdef BOOST_BEAST2_HAS_CORO
+#if 0
         srv.wwwroot.use(
             "/spawn",
             http::co_route(my_coro));