feat: display current version and correct name

platformio.ini

@@ -4,6 +4,9 @@
 [platformio]
 default_envs = uno
 
+[env]
+extra_scripts = pre:tools/inject_version.py
+
 [env:uno]
 platform = atmelavr
 board = uno

src/Config.h

@@ -5,6 +5,12 @@
 
 #include <stdint.h>
 
+// ── Firmware version ──────────────────────────────────────────────────────────
+// Injected at build time by tools/inject_version.py from the git tag.
+#ifndef APP_VERSION
+#define APP_VERSION "dev"
+#endif
+
 // ── Cooperative task intervals (ms) ──────────────────────────────────────────
 // KWP is timing-critical; 0 = run every loop iteration.
 static constexpr uint16_t INTERVAL_KWP_MS = 0;

src/obd/OBDDisplay.cpp

@@ -53,8 +53,8 @@ void OBDDisplay::begin()
 void OBDDisplay::startupAnimation_()
 {
     display_.clear();
-    display_.print(0, 6, F("O B D"));
-    display_.print(2, 8, F("DISPLAY"));
+    display_.print(0, 6, F("OBDisplay"));
+    display_.print(2, 8, F(APP_VERSION));
 
     uint32_t start = millis();
     while (millis() - start < 777)

tools/inject_version.py

@@ -0,0 +1,12 @@
+import subprocess
+Import("env")
+
+try:
+    version = subprocess.check_output(
+        ["git", "describe", "--tags", "--abbrev=0"],
+        stderr=subprocess.DEVNULL,
+    ).decode().strip() or "dev"
+except Exception:
+    version = "dev"
+
+env.Append(CPPDEFINES=[("APP_VERSION", '\\"' + version + '\\"')])