add dev resources; plumb GUI_ENV_FILE/API_ENV_FILE/API_DESI_DATA into run targets

Makefile

@@ -9,6 +9,14 @@ GUI          := gui
 API          := api
 INFRA        := infra
 
+# Local dev/test assets live under resources/dev. These are the defaults for
+# the run/*-web targets; override any of them on the command line, e.g.
+#   make run GUI_ENV_FILE=/path/to/gui.env API_DESI_DATA=/path/to/data.json
+RESOURCE_DIR   := $(CURDIR)/resources/dev
+GUI_ENV_FILE   ?= $(RESOURCE_DIR)/gui.env.example
+API_ENV_FILE   ?= $(RESOURCE_DIR)/api.env.example
+API_DESI_DATA  ?= $(RESOURCE_DIR)/desi_subset.json
+
 .PHONY: help setup run run-web build build-debug build-web test clean fmt \
         renovate-validate
 
@@ -32,9 +40,9 @@ setup: ## Setup all sub-projects (submodules, gui deps, api deps, infra deps)
 ## ---- Renderer (Odin) -----------------------------------------------------
 
 run: ## Run the native app (gui/)
-	@$(MAKE) -C $(API) run & api_pid=$$!; \
+	@API_ENV_FILE="$(API_ENV_FILE)" API_DESI_DATA="$(API_DESI_DATA)" $(MAKE) -C $(API) run & api_pid=$$!; \
 	trap 'kill $$api_pid 2>/dev/null' INT TERM EXIT; \
-	$(MAKE) -C $(GUI) run; \
+	GUI_ENV_FILE="$(GUI_ENV_FILE)" $(MAKE) -C $(GUI) run; \
 	kill $$api_pid 2>/dev/null
 
 build: ## Release build (gui/ + api/)
@@ -49,9 +57,9 @@ build-web: ## WebAssembly build -> build/web (gui/, needs emscripten)
 	@$(MAKE) -C $(GUI) build-web
 
 run-web: ## Start WASM build + API server for web dev
-	@$(MAKE) -C $(API) run & api_pid=$$!; \
+	@API_ENV_FILE="$(API_ENV_FILE)" API_DESI_DATA="$(API_DESI_DATA)" $(MAKE) -C $(API) run & api_pid=$$!; \
 	trap 'kill $$api_pid 2>/dev/null' INT TERM EXIT; \
-	$(MAKE) -C $(GUI) build-web; \
+	GUI_ENV_FILE="$(GUI_ENV_FILE)" $(MAKE) -C $(GUI) build-web; \
 	kill $$api_pid 2>/dev/null
 
 ## ---- Aggregates ----------------------------------------------------------