fix: complete number parsing and add outer interpreter

Co-authored-by: aider (openrouter/moonshotai/kimi-k2.6) <aider@aider.chat>

forth_interp.c

@@ -58,4 +58,40 @@ void process_token(const char* token) {
     } else { // Not a known word: try to parse as number
         char* end;
         long v = strtol(token, &end, 10);
-        if
+        if (end != token && *end == '\0') { // Valid integer
+            if (state == 0) { // Interpret mode: push number
+                data_push((int32_t)v);
+            } else { // Compile mode: compile lit + number
+                Word* lit_w = lookup_word_internal("lit");
+                if (lit_w == NULL) {
+                    printf("Fatal: lit word not found\n");
+                    return;
+                }
+                if (compile_idx + 2 > COMPILE_BUF_SIZE) {
+                    printf("Compile buffer full\n");
+                    return;
+                }
+                compile_buf[compile_idx++] = (Cell){.word = lit_w};
+                compile_buf[compile_idx++] = (Cell){.num = (int32_t)v};
+            }
+        } else {
+            printf("Unknown word: '%s'\n", token);
+        }
+    }
+}
+
+void outer_interpreter(void) {
+    while (1) {
+        printf("ok ");
+        fflush(stdout);
+        if (fgets(input_buf, INPUT_BUF_SIZE, stdin) == NULL) {
+            break; // EOF
+        }
+        input_ptr = input_buf;
+        char* tok;
+        while ((tok = next_token()) != NULL) {
+            process_token(tok);
+        }
+    }
+    printf("\n");
+}