feat(node): skip a file the disk stops answering for, then pause its root

A Windows tester's scan stuck for good on one directory of a large disk:
one read that never returned held the indexer's only thread, and with it
every root behind that one.

- A disk call is timed by its silence, not its length: each directory
  entry listed and each megabyte read counts as an answer. After 60 s of
  silence the call is abandoned on its daemon thread, the file is noted
  unread and the scan goes on.
- Three silent files in a row pause the root (not persisted). Resume
  skips the files already known to give no answer; a restart, a replug
  or a change to the file retries them.
- The walk is per directory with os.scandir: a subdirectory that cannot
  be listed costs itself, and a listing that stops answering pauses the
  root at once. A scan no longer stats anything from the event loop.
- The log names the file after 10 s of silence, the indexing band shows
  it, and Group settings shows the paused root, where it stuck and the
  unread files with their reason, on the node's machine only.
- generate_http_api.py writes LF on Windows too.

Verified with real kernel-blocked opens (an unacknowledged oplock) in the
installed frozen app.

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

1 files changed, 8 insertions, 1 deletions

diff --git a/packages/meshbay-node/tests/test_indexer.py b/packages/meshbay-node/tests/test_indexer.py
index fda40c8..5540be8 100644
--- a/packages/meshbay-node/tests/test_indexer.py
+++ b/packages/meshbay-node/tests/test_indexer.py
@@ -418,7 +418,14 @@ async def test_realtime_watchdog_add_reports_progress_like_a_bulk_scan(tmp_path,
     assert indexer.progress.total_bytes == total_size
     assert indexer.progress.scanned_bytes == 0
 
-    await asyncio.sleep(0.05)   # past debounce_secs; lets all three fire and finish
+    # Past debounce_secs, until all three have fired and finished. Not a fixed
+    # 50 ms: a Windows timer ticks every 15.6 ms, the debounce alone can take
+    # two of them, and the test failed one run in five there on a count of
+    # milliseconds that says nothing about the indexer.
+    for _ in range(200):
+        if not indexer.progress.scanning:
+            break
+        await asyncio.sleep(0.01)
 
     assert indexer.progress.scanning is False, "must end idle, not stuck scanning"
     assert indexer.progress.scanned_bytes == total_size