Stop the shell asserting things that are not true

The footer was rebuilt on a real ledger two commits ago. The rest of the shell
was never audited the same way, and a multi-agent pass over it found the same
class of defect everywhere else:

- A sidebar card reading "Buzz · lumbridgecode / connected · signed identity"
  in the success colour. lumbridge-buzz is not a dependency of this binary.
- A saved host "amd-server", and a WORKTREES section with five entries and a
  working selector, backed by a lumbridge-git crate that does not exist.
- A first-run workspace of six panes announcing "Codex · runtime / metal ·
  Tailscale SSH", "Claude Code · UI / MacBook Air · local" and a Pi pane on a
  saved host. Every one of them was a /bin/sh, and the machine names were this
  developer's.
- A declared "Pi · spark-1 · laguna-s-2.1" usage profile with no probe of any
  kind behind it. Declaring a profile promises the gap is real; that one could
  never be filled.
- FOOTER_CENTER = "Codex · ChatGPT subscription · 62% window remaining",
  rendered by the Floem shell. Decision 0013 names that exact form as the thing
  that must never be shown.
- The header's PTY count painted green unconditionally, so "0/5 LIVE PTYS" read
  as success. runtime_rows already had the right rule three hundred lines away.
- A browser panel describing itself as "An isolated system-web-engine surface"
  on the chooser screen where you pick it. There is no web engine in this build.

First run is now three real local shells, and a pane claims a harness when one
has actually been launched into it. The seed mapping stays for when that is
possible.

Also removes the only unsafe block in the shell: a test set LUMBRIDGE_*_PROBE
through the environment, which needs unsafe under edition 2024 and silently
disabled both probes for every other test in the binary. Replaced with
UsageFeedOptions passed to start_with.

Clippy pedantic on the spike goes 79 -> 15 against root CI's -D warnings, so
graduating it into the workspace is not gated on a warning cleanup. The four
remaining too_many_lines are the render split, which the sidebar work needs to
do anyway.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

spikes/floem-shell/src/main.rs

@@ -12,8 +12,7 @@ use floem::{
     window::WindowConfig,
 };
 use lumbridge_spike_model::{
-    FOOTER_CENTER, FOOTER_RIGHT, FocusDirection, PaneId, PaneState, ShellAction, ShellModel,
-    SurfaceKind, WORKSPACES,
+    FOOTER_FIXTURE_NOTICE, FocusDirection, PaneId, PaneState, ShellAction, ShellModel, SurfaceKind,
 };
 
 const BG: Color = Color::from_rgb8(9, 12, 18);
@@ -132,22 +131,16 @@ fn render_pane_card(pane: PaneState, selected: bool, model: RwSignal<ShellModel>
 }
 
 fn sidebar() -> impl IntoView {
-    let worktrees = Stack::from_iter(WORKSPACES.into_iter().enumerate().map(|(index, name)| {
-        Stack::vertical((
-            Label::new(name),
-            Label::new(if index == 0 { "main · metal" } else { "" })
-                .style(|s| s.font_size(10.0).color(MUTED).margin_top(2.0)),
-        ))
-        .style(move |s| {
-            s.width_full()
-                .padding_vert(7.0)
-                .padding_horiz(10.0)
-                .margin_bottom(3.0)
-                .color(if index == 0 { TEXT } else { MUTED })
-                .apply_if(index == 0, |s| s.background(PANEL_ALT).border_radius(5.0))
-        })
-    }))
-    .style(|s| s.flex_col().padding_horiz(8.0));
+    // The worktree list this shell used to render came from a five-entry
+    // fixture naming this developer's machines, backed by no git integration.
+    // The GPUI shell's copy was deleted in the same pass; this one renders the
+    // workspace it is actually open on.
+    let worktrees = Stack::vertical((Label::new("Lumbridge Code"),)).style(|s| {
+        s.flex_col()
+            .padding_horiz(8.0)
+            .padding_vert(7.0)
+            .color(TEXT)
+    });
 
     Stack::vertical((
         Label::new("ATTENTION · 1").style(|s| s.font_size(10.0).color(ATTENTION).padding(12.0)),
@@ -434,8 +427,7 @@ fn app_view() -> impl IntoView {
             })
         })
         .style(|s| s.flex_grow(1.0)),
-        Label::new(FOOTER_CENTER).style(|s| s.flex_grow(1.0)),
-        Label::new(FOOTER_RIGHT),
+        Label::new(FOOTER_FIXTURE_NOTICE).style(|s| s.flex_grow(1.0)),
     ))
     .style(|s| {
         s.height(32.0)