Subagents and Compact on the server's /api/v2 facts (server 2.0.0-beta.7)

- Models' `subagents {offered, named_only}` and /models' `subagents_cap`; a chat's
  `subagents {offered, named_only, cap}` decides the chip for an open chat (an agent chat
  gets none where the server says so); `named_only` shows the spec's `own` line in the
  popover and marks the chip. GET /chats/{chat}/team stays the fallback for older servers.
- Context: `auto_compact`, `until_compact` and `compactable` from the server (worked out from
  `threshold` with an older one); Compact greyed while not compactable.
- "Tasks: N" for a task's nested fold, the server's sentence; the subagent words aligned with
  the server's catalogues (Podagenti, Sottoagenti, Podagenci); hint says the same-model rule.

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

CHANGELOG.md

@@ -11,16 +11,19 @@ All notable changes to LLeMbas Desktop. The format follows
 - **Subagents**, by that name everywhere. The chip under the message box says **Subagents** with the
   fewest and the most a chat runs, and opens the two fields under those words; it shows where the
   server offers subagents for the chat (for a new chat, for its model), and the most is the
-  server's cap. Subagents work on the chat's own model unless you name another one in the chat --
-  there is no setting for a subagent's model. A scheduled task's field is **Subagents** too.
+  server's cap. Where the chat's model serves one request at a time, it says that subagents need
+  another model, on another server, named in the chat. Subagents work on the chat's own model
+  unless you name another one in the chat -- there is no setting for a subagent's model. A
+  scheduled task's field is **Subagents** too. Needs LLeMbas 2.0.0-beta.7 for the server's word on
+  all of this; with an older one the app guesses as before.
 - **The activity panel, reshaped.** A button in the chat's header opens it at any time, and the
   line above the message box shows only while something runs ("3 running · 1 queued · 2
   finished"). An agent chat's **Environment** (its folder, and where it is) comes first. **Context**
   says how far it is to the automatic compaction ("80.6k until auto-compact") beside a **Compact**
-  button that summarises the earlier turns now. **Background tasks** lists subagents, a team's
+  button that summarises the earlier turns now (greyed while there is nothing to summarise). **Background tasks** lists subagents, a team's
   members and background commands under **Running**, each with how long it has run and a stop
   square, unfolding to what it is, its latest step, what it is writing and its conversation; the
-  tasks under one fold beneath it ("2 tasks"), and the finished ones fold away under **Finished**.
+  tasks under one fold beneath it ("Tasks: 2"), and the finished ones fold away under **Finished**.
   The team's **Room** and the **Plan** have sections of their own.
 
 ## [1.0.0-beta.4] — 2026-11-09