chore: extract shared inject.sh, add red-team-sweep.sh (#806)

## What
- `tools/push3-transpiler/inject.sh` — shared transpile+inject logic used by both batch-eval and red-team-sweep
- `batch-eval.sh` — replaced inline 60-line Python block with `inject.sh` call
- `scripts/harb-evaluator/red-team-sweep.sh` — red-teams each kindergarten seed using existing `red-team.sh`, with random smoke test gate

## Why
Sweep script kept breaking because I rewrote the injection logic instead of reusing batch-eval's proven Python. Now there's one copy.

## Testing
- inject.sh tested manually on DO box with optimizer_v3 seed
- Smoke test picks random seed, injects + compiles before starting sweep

Co-authored-by: openhands <openhands@all-hands.dev>
Reviewed-on: https://codeberg.org/johba/harb/pulls/806
Reviewed-by: review_bot <review_bot@noreply.codeberg.org>

tools/push3-transpiler/inject.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# inject.sh — Transpile a Push3 file and inject into OptimizerV3.sol
+# Usage: bash inject.sh <push3_file> [optimizer_v3_sol]
+# Default OptimizerV3.sol: onchain/src/OptimizerV3.sol (relative to repo root)
+# Exit codes: 0=success, 1=transpile failed, 2=inject failed
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+PUSH3_FILE="${1:?Usage: inject.sh <push3_file> [optimizer_v3_sol]}"
+OPTIMIZERV3_SOL="${2:-$REPO_ROOT/onchain/src/OptimizerV3.sol}"
+TRANSPILER_OUT="$REPO_ROOT/onchain/src/OptimizerV3Push3.sol"
+
+# Ensure transpiler deps
+if [ ! -d "$SCRIPT_DIR/node_modules" ]; then
+  (cd "$SCRIPT_DIR" && npm install --silent) || exit 1
+fi
+
+# 1. Transpile Push3 → OptimizerV3Push3.sol (full contract)
+(cd "$SCRIPT_DIR" && npx ts-node src/index.ts "$PUSH3_FILE" "$TRANSPILER_OUT") || exit 1
+
+# 2. Extract function body and inject between BEGIN/END markers in OptimizerV3.sol
+python3 - "$TRANSPILER_OUT" "$OPTIMIZERV3_SOL" <<'PYEOF' || exit 2
+import sys
+
+push3_path = sys.argv[1]
+v3_path = sys.argv[2]
+
+with open(push3_path) as f:
+    push3 = f.read()
+
+fn_start = push3.find("function calculateParams")
+if fn_start == -1:
+    sys.exit("calculateParams not found in OptimizerV3Push3")
+brace_start = push3.find("{", fn_start)
+body_start = push3.index("\n", brace_start) + 1
+
+lines = push3[body_start:].split("\n")
+body_lines = []
+for line in lines:
+    if line.strip() == "}" and (line.startswith("    }") or line == "}"):
+        break
+    body_lines.append(line)
+
+body = "\n".join(body_lines)
+
+with open(v3_path) as f:
+    v3 = f.read()
+
+begin_marker = "// ── BEGIN TRANSPILER OUTPUT"
+end_marker = "// ── END TRANSPILER OUTPUT"
+begin_idx = v3.find(begin_marker)
+end_idx = v3.find(end_marker)
+if begin_idx == -1 or end_idx == -1:
+    sys.exit("markers not found in OptimizerV3.sol")
+
+begin_line_end = v3.index("\n", begin_idx) + 1
+with open(v3_path, "w") as f:
+    f.write(v3[:begin_line_end])
+    f.write(body + "\n")
+    f.write(v3[end_idx:])
+PYEOF