feat: single-source cross-app wire contracts in @boocode/contracts (v2.7.13)

Move all hand-synced cross-app wire contracts into one built workspace
package, @boocode/contracts, consumed by server/web/coder/coder-web via
workspace:* + a per-subpath exports map. The ws-frames and provider-config
Zod schemas are schema-first (z.infer); MessageMetadata, ErrorReason,
AgentSessionConfig, the provider snapshot types, and WorktreeRiskReport are
each single-sourced. Deletes the byte-identical copies and their parity
tests, fixes a live AgentSessionConfig drift (coder dead copy removed,
unified to the web required/nullable shape), removes the dead pending_change
WS arms in the fallback SPA, and inverts the build order (contracts builds
first) across root build, Dockerfile, and the coder deploy docs. Reverses
the shared-package decision declined in v2.5.12.

apps/coder/web/src/components/DiffPane.tsx

@@ -5,10 +5,9 @@ import { api } from '@/api/client';
 
 interface Props {
   sessionId: string;
-  onPendingChange: (cb: (change: PendingChange) => void) => () => void;
 }
 
-export function DiffPane({ sessionId, onPendingChange }: Props) {
+export function DiffPane({ sessionId }: Props) {
   const [changes, setChanges] = useState<PendingChange[]>([]);
   const [loading, setLoading] = useState(true);
   const [expandedId, setExpandedId] = useState<string | null>(null);
@@ -24,27 +23,13 @@ export function DiffPane({ sessionId, onPendingChange }: Props) {
     }
   }, [sessionId]);
 
-  // Initial load
+  // Initial load. Pending changes are delivered over HTTP (list + apply/reject/
+  // rewind below); there is no WS pending-change frame, so the list refreshes on
+  // mount, on the Refresh button, and optimistically as the user acts on it.
   useEffect(() => {
     fetchPending();
   }, [fetchPending]);
 
-  // Listen for WS pending change events
-  useEffect(() => {
-    const unsub = onPendingChange((change) => {
-      setChanges((prev) => {
-        const idx = prev.findIndex((c) => c.id === change.id);
-        if (idx >= 0) {
-          const next = [...prev];
-          next[idx] = change;
-          return next;
-        }
-        return [...prev, change];
-      });
-    });
-    return unsub;
-  }, [onPendingChange]);
-
   const pendingChanges = changes.filter((c) => c.status === 'pending');
   const resolvedChanges = changes.filter((c) => c.status !== 'pending');