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

src/probe.el

@@ -53,9 +53,10 @@ fn inject_responses(shell: String, responses: String) -> String {
 
 fn probe_main() -> String {
     // Determine subject name
+    let argv: [String] = args()
     let subject: String = ""
-    if arg_count() > 2 {
-        let subject = arg(2)
+    if len(argv) > 2 {
+        let subject = get(argv, 2)
     }
     if str_eq(subject, "") {
         println("[forge] usage: forge probe <name>")