Add DevControlBot garage: skeleton bot with release/debug build script

A minimal Tank Royale bot that boots and stands still. Body, gun and radar
are set to white once at init (team convention: white = not programmed yet);
the tick loop only calls go().

- DevControlBot/ holds the single bot module, its metadata JSON, the
  BotLauncher entry script and the nimble file
- DevControlBot.sh is a thin wrapper around the runBot nimble task:
  release build by default, --debug for the classic diagnostic build
- dependencies resolve at run time from the global nimble store via
  `nimble path`; optional .env (gitignored) supplies env vars such as
  SERVER_URL, with existing environment variables taking precedence
- build happens in a throwaway mktemp dir removed on exit; no artifacts

DevControlBot_garage/DevControlBot/DevControlBot.nim

@@ -0,0 +1,32 @@
+## DevControlBot — control skeleton: boots, stands still, does nothing.
+##
+## Team convention: white means "not programmed yet", so body, gun and radar are
+## all plain white. Colors are applied once at initialization, never per tick.
+##
+## This module is both the bot type and the program entry point (see isMainModule
+## below); there is no separate top-level DevControlBot.nim.
+##
+## API: robocode_tankroyale_botapi 1.0.7 (the renamed tankroyale_botapi package).
+import std/os
+import robocode_tankroyale_botapi
+
+type DevControlBot* = ref object of Bot
+
+proc newDevControlBot*(): DevControlBot =
+  result = DevControlBot()
+  setBodyColor(WHITE)
+  setTurretColor(WHITE)
+  setGunColor(WHITE)
+  setRadarColor(WHITE)
+
+method run*(bot: DevControlBot) =
+  while isRunning():
+    go()
+
+when isMainModule:
+  # argv[1] may override the metadata file (used by DevControlBot/DevControlBot.sh);
+  # otherwise the JSON next to this source, resolved at compile time so any cwd works.
+  let jsonPath = if paramCount() >= 1: paramStr(1)
+                else: currentSourcePath().parentDir / "DevControlBot.json"
+  var bot = newDevControlBot()
+  start(bot, jsonPath)