fix(re-capture): name_block_bases reads the disc from $SYLPHEED_DISC, loudly

Its data-table section globbed `/work/sylph_extract/**/*.pak`, a path that has
existed nowhere since `/work` became a clone. The glob matched nothing, so the
section reported "0 disc names" and an empty table with no error — while the
committed `docs/re/data/name-block-bases.txt`, generated back when the path
existed, records 13 450. The disc is required for that section, so a missing or
non-disc `$SYLPHEED_DISC` is now an error (exit 1), not an empty result.

Verified: without the disc, exit 1 with the message; with
`SYLPHEED_DISC=…/sylph_extract` (the original /work/sylph_extract), the section
reproduces the committed figures exactly — 13 450 distinct disc names,
50 / 261 data-table rows, `sub_82341A20 r30 0x82088F94 217 names 89% disc`.

⚠️ The artefact itself is deliberately NOT regenerated. Rebuilt from the current
database it changes findings — solved bases move, three 15/15 rows vanish, −280
lines — and the cause is the database, not this script: the string extractor's
Shift-JIS path requires kana, so kanji-only Japanese (e.g. the allocator's
`32B  未開放 %4d : 最大…使用量 %4d / %4d` debug lines) is not in `strings`, and
the bases those names pinned no longer resolve (sub_8285F2C8 r5 @ 0x820AE7AC:
15/15 before, 7 now). Regenerating would bake that regression into a cited
research artefact (`docs/re/structures/player-tuning-tables.md`).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tools/re-capture/name_block_bases.py

@@ -194,7 +194,19 @@ def main():
     from unit_substructures import pak_entries
     import unitgroup as _U
     disc = set()
-    for pk in sorted(glob.glob('/work/sylph_extract/**/*.pak', recursive=True)):
+    # 🔴 This globbed `/work/sylph_extract/**/*.pak`, a path that exists nowhere
+    # since `/work` became a clone. The glob matched nothing, so this section
+    # reported `0` disc names and an empty table WITHOUT an error — while the
+    # committed artefact, generated back when the path existed, shows 13 450.
+    # The disc is required for this section, so a missing disc is an error.
+    disc_root = os.environ.get('SYLPHEED_DISC')
+    if not disc_root or not os.path.isdir(os.path.join(disc_root, 'dat')):
+        sys.exit('this report needs the disc: set $SYLPHEED_DISC to an extracted '
+                 'disc root (the directory holding dat/)')
+    paks = sorted(glob.glob(os.path.join(disc_root, '**', '*.pak'), recursive=True))
+    if not paks:
+        sys.exit(f'no .pak files under $SYLPHEED_DISC={disc_root}')
+    for pk in paks:
         for _h, b in pak_entries(pk):
             if b[:4] != b'IDXD':
                 continue