- Multi-user: a non-admin's folder must resolve inside their own userSpacePath
or the session's workingDir (folderAllowedForUser, the path picker's rule),
checked on the resolved folder before it is read and again on each served
file after symlink resolution; 403 otherwise.
- listFolder probes the local folder with probePathKind({ pastCap: true })
first (unknown -> 503 via describeUnknownPath, never 404), then async
fs.realpath; resolveFolderFile uses probePathKind instead of fs.stat.
- The guard runs on the realpath before readdir.
- FOLDER_PATH_LINK_PATTERN ends a folder at ':' (quadratic `://` rescan on
colon runs; PATH=/a:/b linked as one folder).
- Load counters drop stale preview / folder-grid responses; closing the grid
invalidates a listing still in flight.
- validFolderFileName refuses a leading dot; the remote listing matches
extensions in any case.
- Docs: folder grid in the z-index lists; multi-user rule and bounded probe in
the invariants and security docs.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
