hive-agent: the per-agent page has no message box; its send route and the broker's operator message are removed

The page's composer (its input, slash commands and completion), POST /send in
hive-agent, the OperatorMsg request of the agent socket and its handler in
hive-c0re, and the broker-error helper only the send route used are deleted:
writing to an agent is the swarm UI's terminal. cancel turn, new session and
log out stay in the state badge's menu; POST /api/compact stays, with nothing
on the page calling it. The request-line limit keeps its size, and its comment
says it is a generous bound now. The docs describe the actions in place of the
footer and the prompt.

docs/web-ui/README.md

@@ -75,8 +75,8 @@ JS renders — no full-page reloads.
 - **[Dashboard layout](dashboard.md)** — every tab and standalone page,
   in full implementation detail: endpoint shapes, event wiring, exact
   badge-derivation rules.
-- **[Per-agent page](agent.md)** — the per-agent terminal, composer,
-  side panel, slash commands, and per-agent endpoints.
+- **[Per-agent page](agent.md)** — the per-agent terminal,
+  side panel, actions, and per-agent endpoints.
 - **[Shape (shared by both)](shape.md)** — the SPA skeleton, SSE
   multiplexing, terminal pane, listener bind, per-agent relative
   paths, `data-async` form pattern, atomic repaint.
@@ -106,8 +106,8 @@ touching the code rather than using the UI:
   [`terminal-rendering.md`](terminal-rendering.md) (full row taxonomy
   and dispatch walkthrough); for a high-level summary see
   [`agent.md`](agent.md) (Per-stream rendering).
-- **"What slash commands does the agent accept?"** →
-  [`agent.md`](agent.md) (Terminal-embedded prompt).
+- **"What actions does the agent page offer?"** →
+  [`agent.md`](agent.md) (Actions).
 - **"What are the per-agent HTTP endpoints?"** →
   [`agent.md`](agent.md) (Per-agent endpoints).
 - **"Which CSS variable to use / where are colours defined?"** →

docs/web-ui/agent.md

@@ -4,9 +4,10 @@
 > [Shape (shared)](shape.md) · [Dashboard layout](dashboard.md)
 
 
-Three fixed-position layers frame a full-viewport terminal: a header,
-scrollable main content, and a footer composer — plus a slide-in side
-panel for flyouts and long content.
+Two fixed-position layers frame a full-viewport terminal: a header and
+scrollable main content — plus a slide-in side panel for flyouts and long
+content. The page has no message box: to write to an agent, use the swarm
+UI's terminal.
 
 ## Header
 
@@ -91,13 +92,9 @@ at a given viewport width. Two columns:
     (`GET /api/state`'s `links` field) also feeds
     `DashboardState.links` for the dashboard card's icon strip —
     `agent_links()` in hive-agent is the single source of truth for
-    both. The dashboard link lives in this 🔗 popover, and
-    `/new-session` / `/logout` are
-    typed slash commands with their own type-twice confirm (see
-    below).
-  - `/cancel` (slash command, below) is the only cancel-turn path; the
-    turn-loop state badge already shows `thinking` as the
-    discoverability cue.
+    both. The dashboard link lives in this 🔗 popover. `cancel turn`,
+    `new session` and `log out` are rows of the state badge's menu, each
+    with a click-again confirm (see Actions below).
 <!-- vale write-good.Passive = YES -->
 
 Values throughout come from `GET /api/state`'s cold-load snapshot,
@@ -129,22 +126,14 @@ and scrolls behind the fixed header + footer.
   `.terminal-wrap` applies `backdrop-filter: blur` for the frost
   effect, which creates a CSS stacking context — anchoring the
   pill inside that context would confine its `z-index` below the
-  fixed composer in the root stacking context, and it'd never
+  fixed header in the root stacking context, and it'd never
   float. `.agent-main` has no backdrop-filter (no stacking-context
   creators), so the pill's `z-index` reaches the root and properly
-  composites above the composer. Geometry is unchanged —
+  composites above the header. Geometry is unchanged —
   `.agent-main` and `.terminal-wrap` both `inset: 0` fill the same
   area.
 <!-- vale write-good.Passive = YES -->
 
-## Footer / composer
-
-**Fixed-overlay footer** (`<footer class="agent-composer">`): frosted
-glass, symmetric with the header. Contains the operator-input
-textarea (`#term-input`) — multi-line, Enter sends, Shift+Enter
-newlines, Tab-completes slash commands (see [Terminal-embedded
-prompt](#terminal-embedded-prompt) below).
-
 ## Side panel
 
 **Side panel** (slide-in from right): singleton shared with the
@@ -226,35 +215,27 @@ the full row taxonomy and dispatch logic):
   turn-start), triggers a `refreshState()`. The time suffix is
   guarded on a numeric `ts`, so rows degrade cleanly when absent.
 
-## Terminal-embedded prompt
+## Actions
 
-The operator input lives *inside* the terminal-wrap as a
-prompt-style textarea below the live tail: multi-line (Enter
-sends, Shift+Enter newlines), tab-completes slash commands.
+The state badge's menu carries the actions on the agent's claude:
 
-Slash commands today:
-
-- `/help` — list commands locally.
-- `/clear` — wipe the local terminal view (server history kept).
-- `/cancel` — `POST /api/cancel` → SIGINT to the turn's claude and every
+- `cancel turn` — `POST /api/cancel` → SIGINT to the turn's claude and every
   command it started (its process group), emits a Note. On an ACP agent
   it sends the agent `session/cancel` instead, and SIGINT if the turn
-  hasn't ended 10s later. Also surfaces as a `■ cancel turn` button in
-  the state row while state=thinking.
-- `/compact` — `POST /api/compact` → sets the deferred
-  `Bus::request_compact()` flag and returns immediately. The harness
-  runs the `/compact` at the next turn boundary (end of the in-flight
-  turn, or `turn::run_pending_compact` when idle); output streams into
-  the live panel. Works mid-turn, not only when idle. Either way the live
-  panel ends with a `/compact done` or `/compact failed: …` note.
-- `/new-session` — `POST /api/new-session` (confirms first).
+  hasn't ended 10s later. Offered while the state is `thinking`.
+- `new session` — `POST /api/new-session` (confirms first).
   Arms a one-shot on the Bus; next turn runs without
   `--continue`, dropping the resume session entirely.
-- `/logout` — `POST /api/logout` (confirms first). Wipes OAuth
+- `log out` — `POST /api/logout` (confirms first). Wipes OAuth
   credential files, parks the agent in `needs_login`, and preserves
   session history (`~/.claude/projects/`).
 
-Unknown `/foo` shows an error row instead of being silently sent.
+`POST /api/compact` sets the deferred `Bus::request_compact()` flag and
+returns immediately. The harness runs the `/compact` at the next turn
+boundary (end of the in-flight turn, or `turn::run_pending_compact` when
+idle); output streams into the live panel, which ends with a `/compact done`
+or `/compact failed: …` note. It works mid-turn, not only when idle. Nothing
+on this page calls it now.
 
 ## Per-agent endpoints
 
@@ -270,7 +251,6 @@ delivers the new state faster anyway. Only the login flow still
 polls (session output streams in updates that aren't event-
 shaped).
 
-- `POST /send` — operator-injected message into this agent's inbox.
 - `POST /login/{start,code,cancel}` — claude OAuth login flow.
   Start/cancel emit `LiveEvent::StatusChanged` to flip the
   badge to/from `needs_login_in_progress`.