Add broker and web throughput diagnostics

tests/session_broker_diagnostics/run.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""Compile unchanged production broker/console with isolated deterministic doubles.
+No SDK, device, network, or persistent generated files required.
+"""
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parent.parent
+with tempfile.TemporaryDirectory(prefix="broker-diagnostics-") as directory:
+    build = Path(directory)
+    (build / "freertos").mkdir()
+    for name in ("session_broker.c", "session_broker.h", "session_console.c", "session_console.h"):
+        shutil.copyfile(ROOT / "src" / name, build / name)
+    shutil.copyfile(HERE / "fake.h", build / "fake.h")
+    shutil.copyfile(HERE / "test.c", build / "test.c")
+    for name in ("esp_err.h", "esp_heap_caps.h", "esp_console.h", "serial_service.h",
+                 "freertos/FreeRTOS.h", "freertos/queue.h", "freertos/semphr.h",
+                 "freertos/stream_buffer.h", "freertos/task.h"):
+        (build / name).write_text('#include "fake.h"\n')
+    subprocess.run(["cc", "-std=c11", "-D_POSIX_C_SOURCE=200809L", "-Wall", "-Wextra",
+                    "-Werror", "-I", str(build), str(build / "test.c"),
+                    "-o", str(build / "test")], check=True)
+    subprocess.run([str(build / "test")], check=True)