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")"

scripts/igir-dryrun.sh

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+#!/usr/bin/env bash
+# scripts/igir-dryrun.sh   (runs ON valhalla)
+#
+# Read-only igir REPORT for one platform folder against the given DAT(s), then a
+# checksum-status summary + a sample of unmatched files. Used to score a platform
+# ("identified%") before deciding whether to canonicalize it with igir-dorename.sh.
+#
+# DAT paths are relative to libretro-database/metadat (so "no-intro/..." or
+# "redump/...") — the cache populated by scripts/igir-report.ps1.
+#
+#   ssh ginnoir@valhalla 'bash -s -- gb "no-intro/Nintendo - Game Boy.dat"' < scripts/igir-dryrun.sh
+#   # or, already deployed on the host:
+#   ssh ginnoir@valhalla 'bash /storage1/igir/dryrun.sh nes "no-intro/Nintendo - Nintendo Entertainment System.dat"'
+set -uo pipefail
+plat="$1"; shift
+dargs=(); for d in "$@"; do dargs+=(-d "/dats/$d"); done
+out="_dry_${plat}.csv"
+docker run --rm \
+  -v /storage1/Emulation/roms:/input:ro \
+  -v /storage1/igir/dats/libretro-database/metadat:/dats:ro \
+  -v /storage1/igir/reports:/output \
+  node:lts npx -y igir@latest report "${dargs[@]}" \
+    -i "/input/$plat" --report-output "/output/$out" 2>&1 \
+  | grep -E "files found|games," || true
+python3 - "/storage1/igir/reports/$out" <<'PY'
+import csv,sys
+name=sys.argv[1].split('/')[-1]
+found=unused=dup=missing=0; samp=[]
+with open(sys.argv[1],newline='',encoding='utf-8',errors='replace') as fh:
+    for r in csv.DictReader(fh):
+        s=r.get('Status','')
+        if s=='FOUND': found+=1
+        elif s=='UNUSED':
+            unused+=1
+            if len(samp)<10: samp.append(r.get('ROM Files') or r.get('Game Name',''))
+        elif s=='DUPLICATE': dup+=1
+        elif s=='MISSING': missing+=1
+den=found+dup+unused
+pct=100.0*(found+dup)/den if den else 0
+print(f"SUMMARY {name}: identified={pct:.1f}%  matched={found+dup}/{den}  FOUND={found} DUP={dup} UNUSED={unused} MISSING={missing}")
+for x in samp: print("  UNUSED:",x)
+PY