pos communication matrix sender: send (plain/--markdown/--room), login
(password->access token via m.login.password), test. Implements the
lib/notify.sh sender contract, so NOTIFY_PLATFORM=telegram,matrix now
fans out for real; matrix.env config scope registered for pos config.
pos communication matrix listener: systemd user daemon long-polling
/sync (since token, compact m.room.message filter); reacts to own user's
messages (/ and ! both resolve), threaded m.in_reply_to replies, @quiet
marker, ai bridge with per-room session, interactive editor. Added to
INTERACTIVE_CMDS.
Docs: POS.md, howto/communication.md, HOWTO.md, usage EXAMPLES.
Verified against a mock homeserver (send shape, login, owner filter,
replies, exit codes, editor). make gen && make check green.
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