chore: standardize internal bot dir structure (src/, tests/, out/)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

QBot_garage/QBot.nimble

@@ -3,6 +3,7 @@ version       = "0.1.0"
 author        = "Davide Cappellini"
 description   = "Tabular Q-learning Tank Royale bot — chained action decomposition prototype"
 license       = "MIT"
+srcDir        = "src"
 bin           = @["QBot"]
 
 # Dependencies

QBot_garage/config.nims

@@ -1,2 +1,3 @@
 --path:"../common_libs"
 switch("outdir", "out")
+switch("path", thisDir() & "/src")

QBot_garage/src/QBot.nim

@@ -15,8 +15,8 @@ import radar_lock/radar_lock as radar_lock
 
 # ── Constants ──────────────────────────────────────────────────────────────────
 
-const botJsonPath = currentSourcePath().parentDir / "QBot.json"
-const qtablesDir  = currentSourcePath().parentDir / "qtables"
+const botJsonPath = currentSourcePath().parentDir / "../QBot.json"
+const qtablesDir  = currentSourcePath().parentDir / "../qtables"
 
 const
   # State features