chore: branch setup — version.txt, platformio.ini envs, qio_qspi

tools/pio_version_pre.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+"""Pre-build: generate src/version.h from version.txt so the firmware
+   uses the single source of truth for version numbers."""
+Import("env")
+import os
+
+project_dir = env.subst("$PROJECT_DIR")
+ver_file = os.path.join(project_dir, "version.txt")
+out_file = os.path.join(project_dir, "src", "version.h")
+
+versions = {}
+with open(ver_file) as f:
+    for line in f:
+        line = line.strip()
+        if "=" in line:
+            k, v = line.split("=", 1)
+            versions[k.strip()] = v.strip()
+
+header = f"""// Auto-generated from version.txt — DO NOT EDIT
+#define FIRMWARE_VERSION_SERVER "{versions['server']}"
+#define FIRMWARE_VERSION_CLIENT "{versions['client']}"
+"""
+
+with open(out_file, "w") as f:
+    f.write(header)
+
+print(f"  versions: server={versions['server']}  client={versions['client']}  ->  src/version.h")