fix(node): index, serve and write files past Windows' MAX_PATHHEADmain

With the system's default setting (LongPathsEnabled off) every call given
a plain path of 260 characters or more refuses it, so a deep library was
partly invisible: the walk could not list such a directory and its files
never reached the members.

The node now hands each call that touches a group's disk the extended
form (paths.long_path), and keeps the plain path in the index, the hash
cache and the log. A directory is listed under its long form and its
entries named from the plain one (indexer.walk_files, wire._walk_dirs).
Covered: the walk, stats and hashing, reconcile and the watcher, the
folder list members see, serving over WebRTC and QUIC, deletion, uploads
and their recovery, folder creation and removal, audio tags and the
cover beside a track, photos, and a show's episode numbering. ffmpeg
extends a long path itself and keeps the plain one.

long_path now normalises before prefixing (the extended form skips the
system's normalisation) and starts at 248 characters, where creating a
directory is already refused.

test_long_paths.py runs with the setting off: 15 of its 17 tests fail
without the change. Checked by hand in the installed app with files at
312 to 380 characters.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
index 9881298..53f1b27 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
@@ -13,14 +13,16 @@ the rest asynchronously and hands the result back via a callback.
 
 import asyncio
 import logging
+import os
 from collections.abc import Awaitable, Callable
 from pathlib import Path
 
 import blake3
+from meshbay_common.paths import long_path
 from meshbay_common.protocol import IndexEntry
 
 from meshbay_node.indexer import title_parse
-from meshbay_node.indexer.indexer import MEDIA_EXTENSIONS
+from meshbay_node.indexer.indexer import MEDIA_EXTENSIONS, walk_files
 from meshbay_node.media_cache import MediaCache
 from meshbay_node.media_probe import probe_video
 
@@ -102,7 +104,8 @@ def _title_from_siblings(file_path: Path) -> str | None:
     from another Special just like this one.
     """
     try:
-        names = sorted(p.name for p in file_path.parent.iterdir() if p.is_file())
+        with os.scandir(long_path(file_path.parent)) as listing:
+            names = sorted(e.name for e in listing if e.is_file())
     except OSError:
         return None
     checked = 0
@@ -142,8 +145,8 @@ def _synthetic_episode_number(file_path: Path, show_root: Path, season: int) ->
     """
     try:
         candidates = sorted(
-            (p for p in show_root.rglob("*")
-             if p.is_file() and p.suffix.lower() in MEDIA_EXTENSIONS["video"]),
+            (p for p in walk_files(show_root)
+             if p.suffix.lower() in MEDIA_EXTENSIONS["video"]),
             key=lambda p: (str(p.parent), p.name),
         )
     except OSError: