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.

Makefile

@@ -6,12 +6,11 @@ override MAKEFLAGS += --no-print-directory
 
 override FIRMWARE_DIR := firmware
 override DOCS_DIR := docs
-override SITL_DIR := firmware/tools/sitl
 override CONFIGURATOR_DIR := firmware/tools/configurator
 override BOARD_DIRS := $(patsubst %/,%,$(wildcard firmware/boards/*/))
 
 override COMPONENT_TARGETS := $(FIRMWARE_DIR) $(DOCS_DIR) firmware/boards $(BOARD_DIRS) \
-	$(SITL_DIR) $(CONFIGURATOR_DIR)
+	$(CONFIGURATOR_DIR)
 
 override PRIMARY_GOAL := $(firstword $(MAKECMDGOALS))
 override ROUTED_GOAL := $(filter $(PRIMARY_GOAL),$(COMPONENT_TARGETS))
@@ -57,7 +56,7 @@ help: ## Show the command interface (the default)
 		'  nix-shell                    Enter the Nix development shell' \
 		'  build                        Build all firmware and documentation' \
 		'  fmt                          Check Rust, shell, Python, Nix, and TOML formatting' \
-		'  test                         Run Rust, script, and SITL tests' \
+		'  test                         Run Rust and script tests' \
 		'  pre-commit                   Run fmt, firmware clippy/test/docs, and mdBook checks' \
 		'  check                        Run pre-commit plus whitespace checks' \
 		'  clean                        Remove generated build artifacts' \
@@ -74,8 +73,6 @@ help: ## Show the command interface (the default)
 		'  docs -- <mdbook args...>     Pass explicit arguments to mdbook' \
 		'  firmware/tools/configurator -- <args...>' \
 		'                               Pass args to kaptan-configurator' \
-		'  firmware/tools/sitl -- <args...>' \
-		'                               Pass args to kaptan-sim' \
 		'' 'Examples' \
 		'  make firmware -- test --workspace --locked --offline' \
 		'  make firmware clippy' \
@@ -83,8 +80,7 @@ help: ## Show the command interface (the default)
 		'  make firmware/boards/kakute-f7-mini-v3' \
 		'  make firmware/boards/kakute-f7-mini-v3 flash' \
 		'  make docs -- build' \
-		'  make firmware/tools/configurator' \
-		'  make firmware/tools/sitl -- move 5 3 1 --wait'
+		'  make firmware/tools/configurator'
 
 nix-shell: ## Enter the reproducible Nix development shell
 	nix develop
@@ -96,14 +92,13 @@ build: ## Build all firmware boards and documentation
 fmt:
 	+@$(MAKE) -C $(FIRMWARE_DIR) fmt
 	shfmt -d $$(rg --files -g '*.sh')
-	ruff format --check firmware/tools/sitl/kaptan-sim $$(rg --files -g '*.py')
+	ruff format --check $$(rg --files -g '*.py')
 	nixfmt --check $$(rg --files -g '*.nix')
 	taplo format --check $$(rg --files -g '*.toml')
 
 test:
 	python3 -m unittest scripts/test-make-argv.py
 	+@$(MAKE) -C $(FIRMWARE_DIR) test
-	+@$(MAKE) -C $(SITL_DIR) _check
 
 pre-commit: fmt test
 	+@$(MAKE) -C $(FIRMWARE_DIR) clippy