fix(inbox-send): clean error on an unreadable source, dedupe overlapping roots

main caught ValueError and FileNotFoundError around the send, so an unreadable source raised a PermissionError as a raw traceback instead of the clean "inbox-send: <message>" every other failure produces. Widening the catch to OSError covers the unreadable source, the missing source, and any atomic-write failure alike.

discover_projects appended without deduping, so a roots config naming both a parent directory and one of its children listed the same project at two indices. It now dedupes on the resolved path, first-seen order preserved.

0 files changed, 0 insertions, 0 deletions