fix: wire El imports, fix runtime API calls, build passes

- forge.el: add import statements for schema/probe/compiler/install
- All files: arg(n)/arg_count() → get(args(),n)/len(args())
- compiler.el: llm_call_system (utility cap violation) → http_post_with_headers
- install.el: http_post_auth_json → http_post_json (_auth already in body)
- Makefile: local dev build using installed El SDK
- .gitea/workflows/forge-release.yaml: CI build on push + el-sdk-updated dispatch
- dist/forge: builds and runs

Makefile

@@ -0,0 +1,23 @@
+EL_LIB ?= /usr/local/lib/el
+ELC    ?= elc
+CC     ?= cc
+CFLAGS := -std=c11 -O2 -I$(EL_LIB)
+
+.PHONY: build clean install
+
+dist/:
+	mkdir -p dist
+
+dist/forge.c: src/forge.el | dist/
+	$(ELC) src/forge.el > dist/forge.c
+
+dist/forge: dist/forge.c
+	$(CC) $(CFLAGS) -o dist/forge dist/forge.c $(EL_LIB)/el_runtime.c -lcurl -lpthread
+
+build: dist/forge
+
+install: dist/forge
+	install -m 755 dist/forge /usr/local/bin/forge
+
+clean:
+	rm -rf dist/forge dist/forge.c