feat: add BUILD_TOKEN to firmware and consolidate build system

- Generate BUILD_TOKEN from 'git describe --always --dirty'
- Include via -include flag in justfile compile recipe
- Print BUILD_TOKEN in boot banners (DoorbellLogic + uno-r4-wifi)
- Remove all [tasks] from mise.toml; keep only [tools] + [env]
- Update AGENTS.md to use just commands as single source of truth
- Add 'just full' recipe (compile -> upload -> monitor -> watch)
- Switch BOARD var to env_var_or_default for mise set compatibility
- DRY clean/clean-temp with wildcard patterns

libraries/KlubhausCore/src/Config.h

@@ -1,6 +1,10 @@
 #pragma once
 
-#define FW_VERSION "5.1"
+#define FW_VERSION "6.0"
+
+#ifndef BUILD_TOKEN
+#define BUILD_TOKEN "dev"
+#endif
 
 // ── ntfy.sh ──
 #define NTFY_SERVER "ntfy.sh"

libraries/KlubhausCore/src/DoorbellLogic.cpp

@@ -21,7 +21,7 @@ void DoorbellLogic::begin(
 #endif
 
     Serial.println(F("========================================"));
-    Serial.printf(" KLUBHAUS ALERT v%s — %s\n", _version, _board);
+    Serial.printf(" KLUBHAUS ALERT v%s (%s) — %s\n", _version, BUILD_TOKEN, _board);
     if(_debug)
         Serial.println(F(" *** DEBUG MODE — _test topics ***"));
     Serial.println(F("========================================\n"));