_abbrev_table used a list comprehension inline inside a generator
expression filter. In Python 3, list comprehensions have their own
scope, so the loop variable 'cu' was not visible to the outer 'if'
condition — causing a NameError on every !h / !help DM command.
Extract the comprehension to a local variable 'cats_upper' so both
the iteration and the filter operate on the same pre-built list.
Adds an offline BBS accessible via Direct Message to the node's own key.
Access is channel-based: anyone seen on a configured BBS channel is
automatically whitelisted for DM access. Channels stay clean.
- Multi-channel configuration: any combination of device channels can be
selected; senders on any of them are auto-whitelisted
- Short syntax: !p <cat> <text> and !r [cat] alongside full !bbs syntax
- Category abbreviations computed automatically (shortest unique prefix)
- handle_channel_msg: bootstrap reply on channel + auto-whitelist sender
- handle_dm: DM entry point, checks whitelist, routes to post/read/help
- DM reply routed back to sender via command_sink
- SQLite message store with WAL mode and configurable retention
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