[magic-peach]

• rc bindings <command> runs rc-bindings (or RC_BINDINGS_BIN) and passes every argument through, so rc does not need the unpublished extensions Go modules. The tool is added in runtimeconditions/extensions as cmd/rc-bindings.
• rc doctor lists the bindings tool and each profiler with version and core schemas, and fails when one is incompatible.
• Plugins run through one helper that forwards SIGTERM, leaves Ctrl-C to the terminal, passes stdin through, and returns the exit status. Real-binary tests cover stdin, exit status and SIGTERM.
• CI adds Windows, with a test for npm-style .cmd shims.
• The Go profiler stays a separate executable. The release also generates rc-profiler-go.rb from the latest Go profiler release, and rc.rb depends on it.

The workflow additions that only run on GitHub (Windows job, Go profiler formula step) are untested locally.