feat(tools): the real DrussGT now plays and wins Tank Royale battles

The unmodified DrussGT.jar connects, wave-surfs, fires and beats every
adversary we have. 5 rounds each, all rounds won:
  SpinBot 542-16, Corners 823-4, Crazy 604-0, RamFire 900-0,
  ModularBot 506-72.

It is genuinely surfing, not drifting or stalling. Movement statistics
against the classic captures, same metrics, same analyzer:

  opp        perp TR/classic   reversing TR/cl   median range TR/cl
  SpinBot    0.967 / 0.962     0.466 / 0.464     462 / 402
  Corners    0.894 / 0.920     0.462 / 0.419     520 / 504
  Crazy      0.841 / 0.829     0.527 / 0.439     370 / 378
  RamFire    0.762 / 0.651     0.533 / 0.417     326 / 283
  ModularBot 0.956 / -         0.466 / -         453 / -

Every round starts moving within 3-11 ticks and runs at 75-82% full speed.

Implemented: the classic remaining-quantity motion model (delegated to the
TR Bot's own Nat-Pavasant model - identical constants: accel 1, decel -2,
max 8, body turn 10-0.75|v|, gun 20, radar 45 - so getDistanceRemaining and
getTurnRemaining are exactly self-consistent with what is emulated); event
synthesis with classic ordering; bullet identity via object identity; gun
heat; rounds; radar cadence; firing translation; and the ThreadManager
landmine is killed by installing a no-op IThreadManagerBase in
ContainerBase.instance (verified: without it 'RobotException: ThreadManager
cannot be null!' kills the bot thread; with it the write succeeds).

Also adds TrBattleCapture, an observer that dumps per-tick state in the SAME
JSONL fixture format as the classic capture, so legacy bots can be captured
from Tank Royale battles too.

HONEST DIVERGENCES (README section 5.9): the TR server moves along the
PRE-turn heading and then turns, while classic aligns displacement with the
POST-turn heading, so the analyzer's conversion error is ~1.5 deg rather than
0.000 deg; distanceRemaining decrements by target speed rather than actual
distance; collision clamping differs; BulletMissedEvent can fire less often
because age-expiry has no TR event; bulletId is a local temp id;
StatusEvent/onPaint/SkippedTurnEvent are never delivered. Physics fidelity
diverges by construction - expect to retune.

EnergyDomeWorker (the bullet shield) is off by default: its precise
bullet-detection warm-up makes round 1 up to 79% stationary vs 35% in
classic. Rounds 2+ match classic closely with it on, but the pure surfer is
the consistent path. DRUSSGT_SHIELD=1 re-enables it.

Jars remain out of git.

tools/robocode_shim/make_botdir.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Generate a Tank Royale bot directory that boots the DrussGT bridge.
+#
+#   tools/robocode_shim/make_botdir.sh [TARGET_DIR]
+#
+# The generated directory contains only text files (<dir>.json + <dir>.sh); the
+# third-party jars stay outside the repo and are referenced by absolute path.
+set -euo pipefail
+
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TARGET="${1:-/tmp/tr_bots/DrussGT}"
+NAME="$(basename "$TARGET")"
+
+ROBOCODE_JAR="${ROBOCODE_JAR:-/tmp/robocode/install/libs/robocode.jar}"
+TR_BOT_API_JAR="${TR_BOT_API_JAR:-$HOME/Downloads/sample-bots-java-1.0.2/lib/robocode-tankroyale-bot-api-1.0.2.jar}"
+OUT="${OUT:-$HERE/out}"
+
+mkdir -p "$TARGET"
+cat > "$TARGET/$NAME.json" <<JSON
+{
+  "name": "DrussGT",
+  "version": "3.1.4159",
+  "authors": ["Jacob"],
+  "description": "Real classic DrussGT running on Tank Royale via the robocode_shim bridge",
+  "homepage": "",
+  "countryCodes": ["se"],
+  "gameTypes": ["classic", "1v1"],
+  "platform": "JVM",
+  "programmingLang": "Java 8"
+}
+JSON
+
+cat > "$TARGET/$NAME.sh" <<SH
+#!/bin/sh
+cd "\$(dirname "\$0")"
+exec java -cp "$OUT:$ROBOCODE_JAR:$TR_BOT_API_JAR" robocode_shim.DrussGTBridge
+SH
+chmod +x "$TARGET/$NAME.sh"
+
+echo "bot dir ready: $TARGET"
+echo "  $TARGET/$NAME.json"
+echo "  $TARGET/$NAME.sh"
+echo "  (classpath: $OUT:$ROBOCODE_JAR:$TR_BOT_API_JAR)"