feat(cli): /put and /get in the interactive chat

/put FILE sends one local file, relative to the current directory or
absolute, into the chat's folder, then posts the application's attachment
message naming it ({"text": "", "attachment": {filename, size, type}}), so
the page shows it as its paperclip's. /get NAME saves a file of that folder,
named from it, into the current directory, never over a file already there.
The chat's folder is the page's rule: the operator's choice while its root
is writable and present, else the first such root; a chat_directory_ack
moves it. A line above the one written in shows the transfer's progress.

Attachment messages, from the page or from /put, read as [file: name, size]
in the room and in `chat`, and as an `attachment` field with --json.

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

1 files changed, 7 insertions, 2 deletions

diff --git a/packages/meshbay-cli/src/meshbay_cli/commands/chat.py b/packages/meshbay-cli/src/meshbay_cli/commands/chat.py
index d650af3..e410a6a 100644
--- a/packages/meshbay-cli/src/meshbay_cli/commands/chat.py
+++ b/packages/meshbay-cli/src/meshbay_cli/commands/chat.py
@@ -28,7 +28,7 @@ from ..client.groups import my_groups, open_group
 from ..client.paths import group_arg, handle, resolve_group
 from ..client.roster import RosterCheck
 from ..errors import NODE, USAGE, CliError
-from ..output import date, err, safe, sentence
+from ..output import date, err, human_size, safe, sentence
 from .context import Context
 
 HELP = ("chat: alone, interactively; with a group, its last 10 messages (-N for N), "
@@ -147,6 +147,10 @@ def print_message(m, *, flush: bool = False) -> None:
         print(f"{head}[this message cannot be read: {m.unreadable}]", flush=flush)
         return
     lines = safe_lines(m.text)
+    if m.attachment:
+        file_line = (f"[file: {safe(m.attachment['filename'])}, "
+                     f"{human_size(m.attachment['size'])}]")
+        lines = [file_line] if lines == [""] else [file_line, *lines]
     print(head + lines[0])
     for line in lines[1:]:
         print(" " * len(head) + line)
@@ -158,7 +162,8 @@ def print_message(m, *, flush: bool = False) -> None:
 
 def as_json(m) -> dict:
     return {"id": m.id, "timestamp": m.timestamp, "sender": m.sender, "text": m.text,
-            "trust": m.trust, **({"unreadable": m.unreadable} if m.unreadable else {})}
+            "trust": m.trust, **({"unreadable": m.unreadable} if m.unreadable else {}),
+            **({"attachment": m.attachment} if m.attachment else {})}
 
 
 class Follower: