feat(bindings)!: add RVM/Program support across FFI and language bindings (#565)

- FFI: add RVM/Program APIs, execution state accessors, HostAwait handling, and buffer/result helpers in rvm.rs, common.rs, engine.rs.
- Compiler: emit HostAwait for __builtin_host_await in function_calls.rs.
- RVM tests: add HostAwait regression cases and extend harness for suspend/resume responses in host_await.yaml and mod.rs.
- C/C++: add RVM tests/examples and wrapper updates in rvm_tests.c, rvm_tests.cpp, regorus.hpp, plus CMake wiring.
- C#: add Program/Rvm bindings, SafeHandle/PInvoke, tests, and example usage in Regorus, RvmProgramTests.cs, Program.cs, and README updates.
- Go: add Program/Rvm bindings, tests, and examples in rvm.go, rvm_test.go, main.go.
- Java: add Program/Rvm bindings, JNI glue, and examples in lib.rs, regorus, Test.java.
- Python: add Program/Rvm bindings and examples in lib.rs, test.py.
- WASM: add Program/Rvm bindings and examples in lib.rs, test.js.
- Tooling: wire binding tests in xtask and ignore generated Java artifacts in .gitignore.

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

bindings/ffi/Cargo.toml

@@ -30,6 +30,7 @@ default = [
 	"std",
 	"coverage",
 	"allocator-memory-limits",
+	"rvm",
 	"regorus/arc",
 	"regorus/full-opa",
 	"contention_checks",
@@ -40,6 +41,7 @@ std = ["regorus/std"]
 coverage = ["regorus/coverage"]
 allocator-memory-limits = ["regorus/allocator-memory-limits"]
 contention_checks = ["parking_lot"]
+rvm = ["regorus/rvm"]
 custom_allocator = []
 
 [build-dependencies]