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, 11 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/style.css b/packages/meshbay-hub/src/meshbay_hub/static/style.css
index 586f36d..a14bdc3 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/style.css
+++ b/packages/meshbay-hub/src/meshbay_hub/static/style.css
@@ -3681,6 +3681,17 @@ h2 .gn-owner, h3 .gn-owner { font-size: 0.55em; }
   font-size: 0.8em;
   color: var(--text-dim);
 }
+/* Files a scan could not read, with their paths: names somebody else chose. */
+.unread-files { margin-top: 10px; font-size: 0.9em; }
+.unread-files summary { cursor: pointer; color: var(--warn, #d97706); }
+.unread-files ul {
+  margin: 6px 0 0;
+  padding-left: 18px;
+  max-height: 240px;
+  overflow-y: auto;
+}
+.unread-files li { word-break: break-word; margin-bottom: 2px; }
+.unread-files .unread-reason { color: var(--text-dim); margin-left: 6px; }
 .node-root-unavailable { opacity: 0.6; }
 
 .node-message {