feat(roms): add igir per-platform dry-run + rename sweep helpers

igir-dryrun.sh: read-only igir report for one platform vs given DAT(s),
prints an identified%% summary + sample of unmatched files (the scoring
step of the platform sweep).

igir-dorename.sh: igir move to canonical names in place for one platform,
with before/after manifests for reversibility and --dir-game-subdir never
to keep folders flat. Cart-safe; not for disc systems with .m3u.

scripts/igir-dorename.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# scripts/igir-dorename.sh   (runs ON valhalla)
+#
+# igir 'move' to canonical No-Intro/Redump names, in place, for one platform.
+# Records a before/after filename manifest under /storage1/igir/manifests for
+# reversibility. Unmatched files are left untouched; --dir-game-subdir never
+# keeps the folder flat (EmuDeck expects flat per-platform dirs).
+#
+# Only run on platforms that scored healthy in igir-dryrun.sh (>=~80% identified)
+# AND have no co-located saves keyed to ROM basenames (renaming would orphan
+# them) AND are NOT disc systems with .m3u multi-disc playlists (renaming the
+# images breaks the playlists). Carts are the safe case.
+#
+#   ssh ginnoir@valhalla 'bash -s -- gb "no-intro/Nintendo - Game Boy.dat"' < scripts/igir-dorename.sh
+#   # or, already deployed on the host:
+#   ssh ginnoir@valhalla 'bash /storage1/igir/dorename.sh nes "no-intro/Nintendo - Nintendo Entertainment System.dat"'
+#
+# Undo: the before-manifest lists original names; igir is deterministic, so
+# re-running against the same DAT is idempotent.
+set -uo pipefail
+plat="$1"; shift
+dargs=(); for d in "$@"; do dargs+=(-d "/dats/$d"); done
+mkdir -p /storage1/igir/manifests
+before="/storage1/igir/manifests/${plat}-before.txt"
+after="/storage1/igir/manifests/${plat}-after.txt"
+ls -1 "/storage1/Emulation/roms/$plat" > "$before"
+docker run --rm \
+  -v /storage1/Emulation/roms:/input \
+  -v /storage1/igir/dats/libretro-database/metadat:/dats:ro \
+  -v /storage1/igir/reports:/output \
+  node:lts npx -y igir@latest move "${dargs[@]}" \
+    --dir-game-subdir never \
+    -i "/input/$plat" -o "/input/$plat" 2>&1 \
+  | grep -vE "npm notice|npm warn" || true
+ls -1 "/storage1/Emulation/roms/$plat" > "$after"
+echo "RENAME $plat: before_files=$(wc -l < "$before") after_files=$(wc -l < "$after")"