v0.4.0: differentiator — prose for TUI-side (on-daemon-msg, status bar, add-msg)

Prose added:
- gateway-tui-main.org: Contract item 2 updated — on-daemon-msg now
  extracts :gate-trace, :rule-count, :foveal-id from daemon response
- gateway-tui-view.org: Status Bar section — explains the three
  differentiator visualizations (rule counter, focus map, gate trace),
  noting they cost 0 LLM tokens and are unique to Passepartout's
  deterministic gate architecture
- gateway-tui-model.org: Contract item 2 updated — add-msg supports
  &key gate-trace for message-attached trace rendering

org/gateway-tui-view.org

@@ -9,7 +9,8 @@ State is read via ~(st :key)~ — no mutation here.
 ** Contract
 
 1. (view-status win): renders the status bar with connection info,
-   version, and timestamp.
+   msg count, scroll offset, rule counter, focus map (v0.4.0), and
+   timestamp. Two lines: line 1 (status + rules), line 2 (focus + time).
 2. (view-chat win h): renders the scrolled chat message list. Takes
    window and available height. Messages are color-coded: green (user),
    white (agent), yellow (system).
@@ -19,6 +20,23 @@ State is read via ~(st :key)~ — no mutation here.
    flags (status, chat, input). Minimizes terminal writes.
 
 ** Status Bar
+
+The status bar, as of v0.4.0, renders Passepartout's three differentiator
+visualizations — data only available because of the deterministic gate
+architecture:
+
+- *Rule counter* (~Rules:N~): the number of pending HITL actions from the
+  Dispatcher's ~*hitl-pending*~ hash table. The user watches this tick up
+  as they teach the agent their preferences through approve/deny decisions.
+- *Focus map* (~[Focus: <id>]~): the foveal focus from the daemon's signal
+  context. Shows the user what the agent is currently looking at.
+- *Gate trace* (not rendered in status bar — attached to individual
+  messages via ~:gate-trace~ field for future collapsible rendering per
+  message).
+
+All three enrichments cost 0 LLM tokens — they are daemon-state queries
+that the TUI actuator attaches to the response plist before transmission.
+
 #+begin_src lisp
 (in-package :passepartout.gateway-tui)