Fix the PR-divergence respawn loop: loop gate, CEO god-mode, PR conflict resolver, sequence-ordered merge (#164)

* fix(orchestrator,panel): bound the respawn loop gate and give the CEO a status override

The PM respawn loop gate could never fire on a recurring tracing_gap: every
same-status respawn that emitted a tracing_gap reset the strike counter, so a
task whose unblock can never satisfy its decision gate respawned forever. Cap
the number of tracing_gap resets (pm_respawn_max_tracing_resets) so strikes
accrue once a gap is clearly recurring rather than progressing, and route the
pm-review and blocker dispatch respawn paths through the gate so it actually
applies to those loops.

Panel: the task status dropdown was driven solely by the lifecycle graph, so a
task wedged in a terminal/blocked state offered no actionable transitions. Add
an audited admin status override (PATCH status -> admin_set_status) for every
non-in-band target, letting the human operator force any state.

* feat(git): add rebase_onto_base and close_pull_request PR-divergence primitives

Agents had no way to resolve a PR that could not merge because a sibling merged
overlapping work first: their only moves were complete (which 405s) or block
(which loops). Add the two missing operations:

- rebase_onto_base rebases a head branch onto the latest base and classifies
  the outcome: superseded (no unique commits -> safe to close), rebased (unique
  work -> force-pushed, ready to merge), or conflicts (aborted, needs a human).
- close_pull_request retires a superseded PR with an explanatory comment.

These back both the sequence-ordered merge and the conflict resolver.

* feat(gateway): auto-resolve a leaf PR that can't merge instead of looping

When a sibling lands overlapping work first, the cell PM's complete() merge
hits a GitHub 405 and the task re-blocks, respawning the PM forever (the
production wedge: one task burned 6000+ tool calls over 3 hours). The merge
now raises MergeConflictError, and cell_pm_complete resolves it:

- rebase the branch onto the current base;
- superseded (no unique commits) -> close the dead PR + complete the task
  without a redundant merge (the manual action operators kept requesting);
- rebased (unique work) -> retry the merge, then complete;
- genuine conflicts -> admin-override the task to awaiting_ceo_approval and
  alert the CEO, so it leaves agent dispatch instead of looping.

MergeConflictError subclasses GitError, so existing handlers are unaffected.

* test(git): silence unused-arg lint in close_pull_request stub

* feat(orchestrator): sequence-ordered merge for leaf siblings

Leaf siblings share one cell branch, but within-cell siblings were all left at
the default sequence 0, so two leaf PRs raced into the same branch and the
second wedged. Now:

- decomposition assigns each new sibling the next ordinal within its parent, so
  the merge order is well-defined;
- the pm-review dispatcher holds a higher-sequence leaf until its earlier
  same-team siblings are terminal, so they merge into the shared branch in order
  instead of racing.

Loop-free by construction: a gated task is simply not dispatched this tick (no
reject, no respawn). Terminal siblings never block, so a cancelled sibling can't
deadlock the rest; any sibling lookup failure degrades to dispatch.

* test: use monkeypatch.setattr instead of type:ignore in new tests

CI type-checks tests/ (the type-gated suite) which my local 'mypy roboco/' skipped.
The method-mock assignments tripped mypy method-assign/assignment; replace the
silencing comments with monkeypatch.setattr and local mock refs for assertions,
matching the project's no-type:ignore rule.

* fix(git): stop get_status misreporting an unstaged deletion as staged

git_status used stdout.strip().split() before parsing porcelain. strip() eats
the leading space on the first line, so an unstaged deletion (' D file') became
'D file' and parsed as a STAGED deletion — the false 'staged' that caused 6
wasted QA cycles when a dev deleted a file without staging it. Use splitlines(),
which preserves the index/worktree status columns.

* feat(panel): mobile sidebar hamburger + Sheet drawer (AC1)

The umbrella's AC1 was never built: on mobile the sidebar had no entry point.
Extract the nav/footer into shared SidebarNav/SidebarFooter, hide the static
sidebar below md, and add a hamburger in the header that opens the same nav in a
left Sheet drawer (closing on navigation). Desktop is unchanged.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/src/components/layout/sidebar.tsx

@@ -27,7 +27,7 @@ import { Button } from "@/components/ui/button";
 import { ScrollArea } from "@/components/ui/scroll-area";
 import { useUIStore } from "@/store";
 
-const navItems = [
+export const navItems = [
   // Dashboard
   { title: "Overview", href: "/overview", icon: LayoutDashboard },
 
@@ -55,14 +55,89 @@ const navItems = [
   { title: "Metrics", href: "/metrics", icon: Activity },
 ];
 
-export function Sidebar() {
+const footerItems = [
+  { title: "AI Providers", href: "/settings/ai-providers", icon: Cpu },
+  { title: "Settings", href: "/settings", icon: Settings },
+];
+
+/**
+ * The navigation links, shared by the desktop sidebar and the mobile Sheet
+ * drawer so both stay in sync. `collapsed` hides labels (desktop rail);
+ * `onNavigate` lets the mobile drawer close itself when a link is tapped.
+ */
+export function SidebarNav({
+  collapsed = false,
+  onNavigate,
+}: {
+  collapsed?: boolean;
+  onNavigate?: () => void;
+}) {
   const pathname = usePathname();
+  return (
+    <nav className="space-y-1 px-2">
+      {navItems.map((item) => {
+        const isActive = pathname.startsWith(item.href);
+        return (
+          <Link
+            key={item.href}
+            href={item.href}
+            onClick={onNavigate}
+            className={cn(
+              "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors",
+              isActive
+                ? "bg-primary text-primary-foreground"
+                : "text-muted-foreground hover:bg-muted hover:text-foreground",
+              collapsed && "justify-center px-2"
+            )}
+            title={collapsed ? item.title : undefined}
+          >
+            <item.icon className="h-5 w-5 shrink-0" />
+            {!collapsed && <span>{item.title}</span>}
+          </Link>
+        );
+      })}
+    </nav>
+  );
+}
+
+/** Footer links (AI Providers, Settings), shared by desktop + mobile. */
+export function SidebarFooter({
+  collapsed = false,
+  onNavigate,
+}: {
+  collapsed?: boolean;
+  onNavigate?: () => void;
+}) {
+  return (
+    <div className="space-y-1">
+      {footerItems.map((item) => (
+        <Link
+          key={item.href}
+          href={item.href}
+          onClick={onNavigate}
+          className={cn(
+            "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium text-muted-foreground hover:bg-muted hover:text-foreground transition-colors",
+            collapsed && "justify-center px-2"
+          )}
+          title={collapsed ? item.title : undefined}
+        >
+          <item.icon className="h-5 w-5" />
+          {!collapsed && <span>{item.title}</span>}
+        </Link>
+      ))}
+    </div>
+  );
+}
+
+export function Sidebar() {
   const { sidebarCollapsed, setSidebarCollapsed } = useUIStore();
 
   return (
     <aside
       className={cn(
-        "flex h-screen flex-col border-r bg-background transition-all duration-300",
+        // Hidden on mobile — the Header's hamburger opens the same nav in a
+        // Sheet drawer there (see MobileSidebar). Shown from md upward.
+        "hidden h-screen flex-col border-r bg-background transition-all duration-300 md:flex",
         sidebarCollapsed ? "w-16" : "w-64"
       )}
     >
@@ -99,54 +174,12 @@ export function Sidebar() {
 
       {/* Navigation */}
       <ScrollArea className="flex-1 py-4">
-        <nav className="space-y-1 px-2">
-          {navItems.map((item) => {
-            const isActive = pathname.startsWith(item.href);
-            return (
-              <Link
-                key={item.href}
-                href={item.href}
-                className={cn(
-                  "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors",
-                  isActive
-                    ? "bg-primary text-primary-foreground"
-                    : "text-muted-foreground hover:bg-muted hover:text-foreground",
-                  sidebarCollapsed && "justify-center px-2"
-                )}
-                title={sidebarCollapsed ? item.title : undefined}
-              >
-                <item.icon className="h-5 w-5 shrink-0" />
-                {!sidebarCollapsed && <span>{item.title}</span>}
-              </Link>
-            );
-          })}
-        </nav>
+        <SidebarNav collapsed={sidebarCollapsed} />
       </ScrollArea>
 
       {/* Footer */}
-      <div className="border-t p-2 space-y-1">
-        <Link
-          href="/settings/ai-providers"
-          className={cn(
-            "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium text-muted-foreground hover:bg-muted hover:text-foreground transition-colors",
-            sidebarCollapsed && "justify-center px-2"
-          )}
-          title={sidebarCollapsed ? "AI Providers" : undefined}
-        >
-          <Cpu className="h-5 w-5" />
-          {!sidebarCollapsed && <span>AI Providers</span>}
-        </Link>
-        <Link
-          href="/settings"
-          className={cn(
-            "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium text-muted-foreground hover:bg-muted hover:text-foreground transition-colors",
-            sidebarCollapsed && "justify-center px-2"
-          )}
-          title={sidebarCollapsed ? "Settings" : undefined}
-        >
-          <Settings className="h-5 w-5" />
-          {!sidebarCollapsed && <span>Settings</span>}
-        </Link>
+      <div className="border-t p-2">
+        <SidebarFooter collapsed={sidebarCollapsed} />
       </div>
     </aside>
   );