feat(cli): chat — read a group's last messages, post one

chat GROUP prints the last ten messages, oldest first (-N, as head -N, or
-n N for another count, paging back past the node's 200), and -m posts one
(- reads it from stdin). The application's construction: every epoch key
from chat_keys_req, a post sealed under the current epoch through the
device subkey and signed with this machine's key on the node, the sender's
name inside the envelope; nothing sent past the node's ciphertext bound.
A stored message is read signature first, then key, then content, and one
that fails is shown as unreadable, never dropped. Not done here: the Tier 2
roster check on the signing device.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/packages/meshbay-cli/src/meshbay_cli/__main__.py b/packages/meshbay-cli/src/meshbay_cli/__main__.py
index dbb5a19..dd13d50 100644
--- a/packages/meshbay-cli/src/meshbay_cli/__main__.py
+++ b/packages/meshbay-cli/src/meshbay_cli/__main__.py
@@ -13,6 +13,7 @@ import sys
 from . import __version__
 from .commands import (
     browser_access,
+    chat,
     decline,
     devices,
     get,
@@ -33,7 +34,7 @@ from .errors import INTERRUPTED, USAGE, CliError
 
 ACTIONS = {"login": login, "logout": logout, "groups": groups, "invitations": invitations,
            "join": join, "decline": decline, "leave": leave, "ls": ls, "search": search, "get": get,
-           "put": put, "rm": rm, "devices": devices, "trust": trust,
+           "put": put, "rm": rm, "chat": chat, "devices": devices, "trust": trust,
            "browser-access": browser_access}
 
 
@@ -118,6 +119,7 @@ def main(argv: list[str] | None = None) -> int:
         return run()
     parser = build_parser()
     interactive = not argv
+    argv = chat.rewrite_count(argv, ACTIONS)
     try:
         args = parser.parse_args(argv)
     except SystemExit as e:          # --help, --version, or a usage error