terminal: show recv wait/max params + bash [bg] flag

recv tool-use rows rendered as a bare recv() regardless of args,
hiding whether a turn is parked on a long-poll (wait_seconds) or
draining a burst (max). fmtToolUse now surfaces both. Bash rows
gain a [bg] flag when run_in_background is set.

closes #158

docs/terminal-rendering.md

@@ -69,6 +69,10 @@ parent's negative pull.
      `renderRichToolUse` (Write/Edit/send/ask/answer get
      custom renderings); on miss fall through to a flat
      `.tool-use` row with `fmtToolUse → fmtArgsGeneric`.
+     `fmtToolUse` surfaces the salient arg per built-in tool —
+     e.g. `recv` shows `wait <N>s` / `max <N>` when set (bare
+     `recv()` otherwise), `Bash` flags `[bg]` for
+     `run_in_background` commands.
 4. `type == "user"` → walk `message.content[]` for
    `tool_result`; `renderToolResult` correlates via
    `tool_use_id → toolNameById` to default-open `recv`

hive-ag3nt/assets/app.js

@@ -822,11 +822,20 @@
         case 'Edit':       return short + ' ' + (input.file_path || '');
         case 'Glob':       return short + ' ' + (input.pattern || '');
         case 'Grep':       return short + ' ' + (input.pattern || '');
-        case 'Bash':       return short + ' $ ' + (input.command || '');
+        case 'Bash':       return short + (input.run_in_background ? ' [bg]' : '')
+          + ' $ ' + (input.command || '');
         case 'TodoWrite':  return short + ' (' + ((input.todos || []).length) + ' items)';
         case 'mcp__hyperhive__send': return short + ' → ' + (input.to || '?') + ': '
           + JSON.stringify(input.body || '').slice(0, 80);
-        case 'mcp__hyperhive__recv': return short + '()';
+        case 'mcp__hyperhive__recv': {
+          // Surface the long-poll wait + batch size — a bare `recv()` row
+          // hides whether the agent is parking a turn (wait_seconds) or
+          // draining a burst (max).
+          const parts = [];
+          if (input.wait_seconds != null) parts.push('wait ' + input.wait_seconds + 's');
+          if (input.max != null) parts.push('max ' + input.max);
+          return short + (parts.length ? ' ' + parts.join(' · ') : '()');
+        }
         case 'mcp__hyperhive__request_spawn': return short + ' ' + (input.name || '');
         case 'mcp__hyperhive__kill':          return short + ' ' + (input.name || '');
         case 'mcp__hyperhive__request_apply_commit':