feat(agent-term): matrix-tool icons + formatters, fill remaining fmtToolUse gaps

Add specific icons for matrix tools that had the generic 💬 fallback:
- mcp__matrix__read_room → 📖
- mcp__matrix__mark_read → 👁️
- mcp__matrix__list_rooms / list_room_members / list_invites → 📋
- mcp__bash__kill → 🛑 (was generic 🔧)

Add fmtToolUse cases for high-use tools that fell through to fmtArgsGeneric:
- set_status: 'set_status* "idle"' instead of 'set_status text: "idle"'
- get_loose_ends: 'get_loose_ends* [iris]' or 'get_loose_ends*()'
- get_agent_meta: 'get_agent_meta* iris' or 'get_agent_meta*()'
- cancel_loose_end: 'cancel_loose_end* question #42'
- bash kill: 'kill* abc123 [force]'
- Matrix tools: 'read_room* !abc1234 [50]', 'mark_read* !abc1234',
  'send_message* → !room: "body"', 'send_dm* → @mara: "body"',
  'send_reply*', 'send_reaction*', 'join_room*', 'open_dm*',
  'invite_user*', 'download_file*'

Also extend the short-name shortening to cover mcp__matrix__ prefix
(was only hyperhive + bash), so matrix tool rows show 'read_room*'
instead of 'mcp__matrix__read_room' as the prefix.

Two small helpers added: fmtRoom (truncates !id before ':' for
readability; keeps #alias intact) and fmtUser (@user:server → @user).

Closes #2198. Updates terminal-rendering.md icon list.

docs/terminal-rendering.md

@@ -56,7 +56,7 @@ parent's negative pull.
 | `.turn-time` | `· HH:MM:SS` on turn-start; `· HH:MM:SS · <dur>` on turn-end (child span) | muted, smaller | per-event `ts` (unix seconds) on the live frame + history row | harness |
 | `.text` | (no prefix; markdown body) | fg | claude `assistant.content[].text` | stream-json |
 | `.thinking` | `💭 thinking …` | muted, italic | claude `assistant.content[].thinking` | stream-json |
-| `.tool-use` (flat) | `<icon> Name args…` | cyan | tool_use w/o rich renderer; `<icon>` from `toolIcon(name)` (📤 send · 📥 recv · ❓ ask · ⏰ remind · 🏷️ set_status · 🪢 loose-ends · 🖥️ bash · 💬 matrix · 📦 request_* · ⏱️ schedule · 🔧 default) | stream-json |
+| `.tool-use` (flat) | `<icon> Name args…` | cyan | tool_use w/o rich renderer; `<icon>` from `toolIcon(name)`: 📤 send · 📥 recv · ❓ ask · ⏰ remind · 🏷️ set_status · 🪢 loose-ends · ✂️ cancel_loose_end · ℹ️ get_agent_meta · ✅ ack_until · 📜 get_logs/get_host_journal · ↻ restart · ⏹️ kill · ▶️ start · 🔄 update · 📋 list_containers/list_rooms/list_room_members/list_invites · 📖 read_room/Read · 👁️ mark_read · 🛑 bash kill · 🖥️ bash other · 💬 matrix send/reply/dm · 📦 request_* · ⏱️ schedule · 🔧 default | stream-json |
 | `.tool-use` `<details>` | `💾/✏️ Write/Edit <path> · +N` (no `→`) | cyan, body is +/- diff | `renderRichToolUse` Write/Edit | stream-json |
 | `.tool-use` `<details open>` | `📤 send → to · NL`, `❓ ask → to`, `✍️ answer #id` | cyan, body is markdown | rich renderer for send / ask / answer | stream-json |
 | `.tool-use .ask-answer-inline-slot` | (sub-block under `ask → operator`) | inherits row | inline answer form bound by `reconcileAskBinds` to the loose-end | rich renderer |

frontend/packages/agent/src/app.js

@@ -1524,6 +1524,12 @@ window.marked = marked;
       'mcp__hyperhive__list_containers': '📋',
       'mcp__hyperhive__get_logs': '📜',
       'mcp__hyperhive__get_host_journal': '📜',
+      'mcp__matrix__read_room': '📖',
+      'mcp__matrix__mark_read': '👁️',
+      'mcp__matrix__list_rooms': '📋',
+      'mcp__matrix__list_room_members': '📋',
+      'mcp__matrix__list_invites': '📋',
+      'mcp__bash__kill': '🛑',
       Read: '📖', Write: '💾', Edit: '✏️', Glob: '🔍', Grep: '🔍',
     };
     function toolIcon(name) {
@@ -1537,6 +1543,22 @@ window.marked = marked;
       }
       return '🔧';
     }
+    // Shorten a matrix room id or alias for display. Room ids (!xxx:server)
+    // are trimmed to the first 8 local chars; aliases (#name:server) are
+    // returned as-is (they're already readable). Falls back to the raw
+    // value truncated.
+    function fmtRoom(r) {
+      if (!r) return '?';
+      if (r.startsWith('!')) return r.slice(0, r.indexOf(':') > 0 ? r.indexOf(':') : 9);
+      if (r.startsWith('#')) return r.split(':')[0] || r;
+      return trim(r, 20);
+    }
+    // Shorten @user:server → @user.
+    function fmtUser(u) {
+      if (!u) return '?';
+      const colon = u.indexOf(':');
+      return colon > 0 ? u.slice(0, colon) : u;
+    }
     // Pretty-print a tool call: per-known-tool format, fallback to JSON
     // for unknown tools.
     function fmtToolUse(c) {
@@ -1546,7 +1568,9 @@ window.marked = marked;
         ? name.slice('mcp__hyperhive__'.length) + '*'
         : name.startsWith('mcp__bash__')
           ? name.slice('mcp__bash__'.length) + '*'
-          : name;
+          : name.startsWith('mcp__matrix__')
+            ? name.slice('mcp__matrix__'.length) + '*'
+            : name;
       switch (name) {
         case 'Read':       return short + ' ' + (input.file_path || '');
         case 'Write':      return short + ' ' + (input.file_path || '');
@@ -1611,6 +1635,39 @@ window.marked = marked;
         case 'mcp__bash__status':
           return short + ' id:' + (input.id || '?')
             + (input.wait_seconds != null ? ' · wait ' + input.wait_seconds + 's' : '');
+        case 'mcp__bash__kill':
+          return short + ' ' + (input.id || '?') + (input.force ? ' [force]' : '');
+        case 'mcp__hyperhive__set_status':
+          return short + ' "' + trim(String(input.text || ''), 60) + '"';
+        case 'mcp__hyperhive__get_loose_ends':
+          return short + (input.agent ? ' [' + input.agent + ']' : '()');
+        case 'mcp__hyperhive__get_agent_meta':
+          return short + (input.name ? ' ' + input.name : '()');
+        case 'mcp__hyperhive__cancel_loose_end':
+          return short + ' ' + (input.kind || '?') + ' #' + (input.id != null ? input.id : '?');
+        case 'mcp__matrix__read_room':
+          return short + ' ' + fmtRoom(input.room)
+            + (input.limit != null ? ' [' + input.limit + ']' : '');
+        case 'mcp__matrix__mark_read':
+          return short + ' ' + fmtRoom(input.room);
+        case 'mcp__matrix__send_message':
+          return short + ' → ' + fmtRoom(input.room) + ': '
+            + JSON.stringify(trim(String(input.body || ''), 50));
+        case 'mcp__matrix__send_dm':
+          return short + ' → ' + fmtUser(input.user_id) + ': '
+            + JSON.stringify(trim(String(input.body || ''), 50));
+        case 'mcp__matrix__send_reply':
+          return short + ' → ' + fmtRoom(input.room) + ': '
+            + JSON.stringify(trim(String(input.body || ''), 50));
+        case 'mcp__matrix__send_reaction':
+          return short + ' ' + fmtRoom(input.room) + ' ' + (input.key || '?');
+        case 'mcp__matrix__join_room':
+        case 'mcp__matrix__open_dm':
+          return short + ' ' + (fmtRoom(input.room) || fmtUser(input.user_id) || '?');
+        case 'mcp__matrix__invite_user':
+          return short + ' ' + fmtUser(input.user_id) + ' → ' + fmtRoom(input.room);
+        case 'mcp__matrix__download_file':
+          return short + ' ' + fmtRoom(input.room);
         default: return fmtArgsGeneric(short, input);
       }
     }