Migrate Windows file clients to the broker

[Weidong Cui (wdcui)]

This PR routes Windows file, PE loader, NLS, section, and runner operations through broker-backed LiteBox APIs and atomically moves registry keys and typed values into the isolated /registry namespace, with shared in-process broker coverage for the migrated behavior.

[github-actions]

ℹ️ Note: This semver check was run against the wdcui/ulitebox/broker-files-09-windows-facade branch, not main or ulitebox.

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

Click for details

--- failure constructible_struct_adds_field: struct exhaustively constructible through public API adds field ---

Description:
A pub struct that could be exhaustively constructed with a literal using only public API has a new pub field, breaking existing exhaustive literals.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field CliArgs.broker_control_channel in /home/runner/work/litebox/litebox/litebox_runner_windows_on_linux_userland/src/lib.rs:45

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/inherent_method_missing.ron

Failed in:
  WindowsShimBuilder::new, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-wdcui_ulitebox_broker_files_09_windows_facade/25d61a9739fcb00496d2c67f0c2ce278dc0d2c85/litebox_shim_windows/src/lib.rs:409
  WindowsShimBuilder::default_fs, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-wdcui_ulitebox_broker_files_09_windows_facade/25d61a9739fcb00496d2c67f0c2ce278dc0d2c85/litebox_shim_windows/src/lib.rs:426

--- failure method_parameter_count_changed: pub method parameter count changed ---

Description:
A publicly-visible method now takes a different number of parameters, not counting the receiver (self) parameter.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/method_parameter_count_changed.ron

Failed in:
  litebox_shim_windows::WindowsShim::load_program takes 4 parameters in /home/runner/work/litebox/litebox/target/semver-checks/git-wdcui_ulitebox_broker_files_09_windows_facade/25d61a9739fcb00496d2c67f0c2ce278dc0d2c85/litebox_shim_windows/src/lib.rs:510, but now takes 3 parameters in /home/runner/work/litebox/litebox/litebox_shim_windows/src/lib.rs:492