docs(web-ui/agent): add section headers, dedupe shared shape/rendering detail, trim changelog framing

docs/web-ui/agent.md

@@ -4,7 +4,11 @@
 > [Shape (shared)](shape.md) · [Dashboard layout](dashboard.md)
 
 
-Three fixed-position layers frame a full-viewport terminal:
+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.
+
+## Header
 
 **Fixed-overlay header** (`<header class="agent-header">`): frosted
 glass — `backdrop-filter: blur` lets scrolled terminal rows show
@@ -121,8 +125,11 @@ just `name`). The frontend uses `qualified_label` to set the browser
 tab title so two tabs from different hives are distinguishable; the
 header `<h2 id="title">` stays short.
 
+## Main content
+
 **Main content** (`<main class="agent-main">`): fills the viewport
 and scrolls behind the fixed header + footer.
+
 - `#status` overlay: empty when online; shows the login form / OAuth
   URL when `status` is `needs_login_*`. The OAuth code input is
   `type="password"` with a `👁 reveal` toggle that flips it back to
@@ -146,11 +153,15 @@ and scrolls behind the fixed header + footer.
   `.agent-main` and `.terminal-wrap` both `inset: 0` fill the same
   area.
 
+## 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" below).
+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
 dashboard's side panel shape. Carries inbox and todos flyouts (opened
@@ -175,21 +186,12 @@ the checked ids to `POST /api/todos/mark-done`, which dismisses them
 from the harness-local store (same effect as `cancel_loose_end(kind:
 "todo")`, just from the web UI instead of the agent's own tool calls).
 
-Older per-agent flyouts this doc used to describe (a "loose-ends"
-list of questions/approvals/reminders backed by a since-removed
-`GET /api/loose-ends`, and a read-only "tasks" list of in-flight bash
-tasks backed by a since-removed `GET /api/bash-tasks`) no longer
-exist — todos superseded both. A third casualty of that migration —
-an "ask → operator" inline-answer form that used to mount under an
-`mcp__hyperhive__ask(to: "operator", ...)` row in the terminal
-scrollback — depended on the same removed `/api/loose-ends` endpoint
-and was found dead (hyperhive#2922: the binding never fired, so the
-slot never mounted a form). Per mara's call on that issue, it was
-removed rather than rebuilt — the main dashboard's own question
-surfacing (`dashboard/src/swarm.js` + `call.js`) is the one supported
-path for answering a pending question as the operator; this agent's
-own terminal just shows the `ask` tool call like any other tool call,
-with no inline answer affordance.
+The todos flyout is the only per-agent flyout — there is no separate
+"loose-ends" or "tasks" list. There is also no inline answer form for
+`ask` tool calls in this terminal: an `ask` renders like any other
+tool call, and the operator answers a pending question from the
+dashboard's Y3R C4LL tab instead (see
+[`terminal-rendering.md`](../terminal-rendering.md#inline-ask-operator-answer)).
 
 ## Live view
 
@@ -202,17 +204,19 @@ seconds) — a flattened sibling of the event tag on both the live
 SSE frame and the replayed history rows. The web UI:
 
 - fetches `GET /events/history` on page load and replays the last
-  2000 events (oldest first, with `.no-anim` so they don't
-  stagger);
+  2000 events (oldest first);
 - then subscribes to `GET /events/stream` (SSE) for live tail;
 - shows a granular state badge above the terminal, driven
   authoritatively from `/api/state.turn_state`. SSE turn_start /
   turn_end still flip the badge instantly between renders;
-- sticky-bottom auto-scroll: scrolling up parks the view; new rows
-  surface a "↓ N new" pill instead of yanking;
 - terminal-themed: phosphor mauve glow, Crust bg,
   backdrop-filter blur, row fade-in slide-up.
 
+The backfill/live-tail dedupe, sticky-bottom auto-scroll, and "↓ N
+new" pill are the shared terminal-pane mechanics described in
+[Shape](shape.md#shared-terminal-pane) — this page's log is one
+instance of that same factory.
+
 Per-stream rendering (see [`docs/terminal-rendering.md`](../terminal-rendering.md) for
 the full row taxonomy and dispatch logic):
 
@@ -323,9 +327,9 @@ shaped).
      (`projects/<hash>/*.jsonl`), sessions, shell-snapshots,
      plans, settings, telemetry, and the dir itself, so
      `claude --continue` keeps working after a fresh login.
-     Wholesale `remove_dir_all` of `~/.claude/` was the previous
-     shape and broke session continuity; the narrowed allow-list
-     is the fix.
+     ⚠️ Deleting the whole `~/.claude/` directory instead breaks
+     session continuity — logout must stay narrowed to just the
+     credential files.
   3. Flip `LoginState::NeedsLogin` + emit a `LiveEvent::Note`
      describing exactly what was wiped, then emit
      `needs_login_idle`. The turn-loop's next iteration parks