feat(web): W3-3 site workbench, sources/feeds/snapshots, downloads with business timeline, organization records and agent sessions

- sites + /sites/:siteId: organized view with snapshot-first release list, inventory overlay,
  candidate reasons, volatile-field recheck, stale marking that keeps existing data, live search,
  unified download entry; origin view placeholder (M2)
- sources: feed CRUD/enable/fetch/reset, cursor/health/gap hints; per-site snapshot history
- tasks: download tasks with pause/resume (threshold pause cannot be bypassed), plans,
  cache volume thresholds and cleanup, business timeline (observation → plan → download →
  organization → agent/engine)
- organize: record list/detail with file-level results, manual organize with dryRun preview
- agent: session list/page and layout drawer with context prefix; streaming events,
  tool cards, rejection alerts, compaction, budget meters, model text vs server report;
  mock switch (?mock=1) until W2-D endpoints land

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/routes/console/layout.tsx

@@ -3,6 +3,7 @@ import { ChevronLeft, ChevronRight, Clapperboard, LoaderCircle, Menu } from "luc
 import { useCallback, useEffect, useLayoutEffect, useRef, useState } from "react";
 import { Link, NavLink, Outlet, useLocation } from "react-router";
 import { useSession } from "~/api/auth.ts";
+import { AgentDrawer, AgentDrawerTrigger } from "~/components/agent/agent-drawer.tsx";
 import { AccountMenu } from "~/components/console/account-menu.tsx";
 import { ErrorState } from "~/components/console/empty-state.tsx";
 import { CONSOLE_BASE, findNavItem, NAV_GROUPS, NAV_ITEMS, type NavGroup } from "~/components/console/nav.ts";
@@ -222,6 +223,7 @@ function ConsoleShell({ session }: { session: SessionInfo }) {
             <span className="truncate text-sm font-semibold text-foreground">{activeLabel}</span>
           </div>
           <div className="ml-auto flex items-center gap-2">
+            <AgentDrawerTrigger />
             <ThemeToggle />
             <AccountMenu session={session} />
           </div>
@@ -232,6 +234,7 @@ function ConsoleShell({ session }: { session: SessionInfo }) {
             <Outlet />
           </div>
         </main>
+        <AgentDrawer />
       </div>
     </div>
   );