Refine email-proposal review UX (v0.1.0:91)

Three post-smoke refinements to the Matrix email-proposal review:

1. Dash separators (bot): every card/reply is framed with a dash rule top and
   bottom so threads stop bleeding together vertically on mobile.

2. Remove decided threads (bot): on a conclusive approve/dismiss from either
   surface, the bot redacts the card (client.room_redact) so the room clears
   down to only undecided items. Redacting the bot's own card needs no power;
   the web->Matrix path now redacts instead of posting a closure note.

3. Clearer note wording (server v91 + bot): the proposed grid note now names who
   emailed whom -- "{teammate} emailed {investor}" (outbound) / "{sender} emailed
   the team" (inbound) -- instead of an ambiguous "Sent"/"Received". Outbound
   detection also matches our corporate domain (public providers excluded), so a
   teammate's mail from a non-enrolled @ten31.xyz address no longer reads as
   "Received". Going-forward only; no schema change. The card drops its bare
   direction label since the note now carries the relationship.

Tests updated; 30/30 green, render-smoke green.

backend/matrix_intake/email_proposals.py

@@ -16,6 +16,12 @@ _YES = {"yes", "y", "approve", "approved", "ok", "confirm", "go", "add", "👍",
 _NO = {"no", "n", "cancel", "discard", "reject", "skip", "stop", "👎", "❌"}
 
 _SNIPPET_MAX = 400  # email snippet shown on the card; the full body is in the web popup
+RULE = "-----------------------"  # top/bottom rule so threads don't bleed together on mobile
+
+
+def frame(text):
+    """Wrap a message in dash rules so each card/reply is visually bounded in the room."""
+    return f"{RULE}\n{text}\n{RULE}"
 
 
 def _truncate(s, n):
@@ -26,11 +32,10 @@ def _truncate(s, n):
 def render_card(item):
     """The review card posted to the Matrix review room: who/when + a short email snippet + the
     drafted note. Deliberately compact for mobile — the full scrollable body is in the web Email
-    Capture popup (this is the metadata+snippet+note choice)."""
+    Capture popup. Direction isn't a bare label anymore — the note itself names who emailed whom."""
     name = item.get("investor_name") or "Unknown investor"
-    direction = "Sent" if item.get("direction") == "sent" else "Received"
     frm = item.get("from_name") or item.get("from_email") or "?"
-    lines = [f"📧 Proposed **grid note** for **{name}** ({direction})"]
+    lines = [f"📧 Proposed **grid note** for **{name}**"]
     if item.get("email_subject"):
         lines.append(f"· Subject: {item['email_subject']}")
     if item.get("email_date"):
@@ -44,13 +49,7 @@ def render_card(item):
     lines.append("")
     lines.append("Reply **yes** to add it to the grid, **no** to dismiss, or just tell me how to "
                  "change the note (e.g. *say we discussed the Q3 raise*).")
-    return "\n".join(lines)
-
-
-def closure_line(status):
-    """Posted in-thread when a proposal was decided on the WEB while its Matrix thread was open."""
-    verb = "approved ✅ and added to the grid" if status == "approved" else "dismissed 🗑️"
-    return f"This was {verb} on the web — nothing more to do here. Thread closed."
+    return frame("\n".join(lines))
 
 
 def interpret(text):