refactor(firmware): remove the retired simulation workflow

Remove the retired simulator workspace member, dependencies, workflow
and documentation. Keep the shared flight and hardware crates.

Validation: retirement prefix host check, command-dispatch tests and
book build.

docs/src/development.md

@@ -10,8 +10,7 @@ directory path to that directory's Makefile.
 The standard `--` ends Make's own options. Every following argument uses the
 selected application's native command line. For example,
 `make firmware -- test --workspace --locked --offline` runs `cargo test
---workspace --locked --offline` from `firmware`, while
-`make firmware/tools/sitl -- ready` runs `kaptan-sim ready`. Board paths are
+--workspace --locked --offline` from `firmware`. Board paths are
 the complete build-and-package command, so they need no invented operation
 name.
 
@@ -37,7 +36,7 @@ make firmware -- clippy \
 `make firmware docs` builds Rust API documentation with warnings denied.
 `make docs` checks and builds the separate mdBook project. `make pre-commit`
 runs both documentation checks along with repository formatting, host and
-embedded Clippy, Rust and script tests, and SITL structure tests. `make check`
+embedded Clippy, Rust and script tests. `make check`
 adds a whitespace check. `make build` builds and packages release firmware and
 builds the mdBook project.
 
@@ -53,16 +52,3 @@ The strict gate requires 100% line and branch coverage for `kaptan-math`,
 core package's coverage artifacts, unions LCOV source-line records, and uses
 full LLVM source spans to merge generic branch instantiations without lowering
 the gate.
-
-## Simulation acceptance
-
-```sh
-cd firmware/tools/sitl
-python3 world-structure-test.py
-python3 -m unittest test_kaptan_sim.py
-./e2e-smoke.sh
-```
-
-The Docker smoke is intentionally separate from host unit tests because it
-builds the pinned base images, Rust binary, Gazebo plugin, and full loopback
-plant.