feat: add shared integration test framework for garages (#126)

Implements:
- BattleResult type and JSON-lines parser (#127)
- TR server lifecycle manager (#128)
- Bot compiler using nim c (#129)
- runBattle() orchestrator (#130)
- Example test in OscillatorBot_garage (#131)
- Framework usage guide (#132)
- TestBattleRunner.java for external server (#133)
- BattleRunner process lifecycle (#134)

Fix: runner_process.nim was redefining TimeoutError locally; now
uses std/net.TimeoutError consistently with server_manager.nim.

OscillatorBot_garage/OscillatorBot.nimble

@@ -8,5 +8,8 @@ bin           = @["OscillatorBot"]
 
 # Dependencies
 requires "nim >= 2.0.0"
-# tankroyale_botapi and radar_lock are vendored in-tree (common_libs/) and wired via
-# config.nims --path; no nimble dependency so builds never touch ~/.nimble/pkgs2.
+requires "tankroyale_botapi >= 1.0.1"
+# radar_lock is vendored in-tree (common_libs/) and wired via config.nims --path
+
+task test, "Compile and run integration tests":
+  exec "nim c -r --path:../common_libs tests/test_basic_battle.nim"