add rig extraction scripts

scripts/rig-rewrite-imports.sh  — package rewrites yesman.epicfight.* → com.tiedup.remake.rig.*
scripts/rig-headers.sh          — GPLv3 + attribution Epic Fight header injection
scripts/rig-extract-phase0.sh   — master script Phase 0 (copy + rewrite + headers)

Cf. docs/plans/rig/EXTRACTION.md §9 (docs restent locales).

scripts/rig-headers.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# rig-headers.sh
+# Ajoute un header attribution Epic Fight + GPLv3 à chaque fichier .java
+# forké dans v3/rig qui n'en a pas déjà un.
+
+set -u
+
+TARGET="${1:-src/main/java/com/tiedup/remake/rig}"
+
+if [ ! -d "$TARGET" ]; then
+    echo "ERROR: target dir not found: $TARGET"
+    exit 1
+fi
+
+HEADER='/*
+ * Derived from Epic Fight (https://github.com/Epic-Fight/epicfight)
+ * by the Epic Fight Team, licensed under GPLv3.
+ * Modifications © 2026 TiedUp! Remake Contributors, distributed under GPLv3.
+ */
+
+'
+
+count=0
+skipped=0
+find "$TARGET" -type f -name "*.java" | while read f; do
+    if head -5 "$f" | grep -q "Derived from Epic Fight"; then
+        skipped=$((skipped + 1))
+    else
+        tmp=$(mktemp)
+        printf '%s' "$HEADER" > "$tmp"
+        cat "$f" >> "$tmp"
+        mv "$tmp" "$f"
+        count=$((count + 1))
+    fi
+done
+
+echo "Headers injected in files (check count via grep)."
+echo "Run: grep -l 'Derived from Epic Fight' $TARGET -r | wc -l"