perf: overhaul session loading, caching, and runtime isolation (#2360)

Improve OpenChamber responsiveness under large session workloads while fixing
cache, synchronization, and persistence correctness across runtimes, projects,
directories, and worktrees.

- prioritize selected and visible sessions during bootstrap and defer
  non-critical enrichment work
- reduce redundant message loading, event processing, store publication, and
  hidden sidebar work
- prevent stale session and message requests from overwriting newer
  authoritative state
- preserve existing data when authoritative fetches fail instead of treating
  failures as successful empty responses
- scope session materialization, messages, drafts, queues, todos, pins,
  permissions, folders, tabs, Git state, and pull request data by runtime and
  directory identity
- harden runtime switching, reconnect, cleanup, mutation reconciliation, and
  persisted-state ordering
- preserve live subagent Task linkage when metadata arrives after an older
  message request or while streaming parts are suspended
- coalesce overlapping tail refreshes without losing newer refresh demand
- improve cold-session loading by moving deferrable work out of the critical
  bootstrap path
- isolate URL authentication, mobile credentials, native secrets, and other
  runtime-owned state across endpoint changes
- bound long-lived caches and remove avoidable allocations from event and
  rendering hot paths
- limit virtualization to archive collections where it improves rendering
  without disrupting active sidebar layout
- stabilize session folders, pin ordering, expanded state, and persisted
  sidebar behavior
- open skill files through the same secure editor and outside-workspace grant
  flow used by file navigation, including worktree sessions
- expand regression coverage for stale completions, runtime collisions,
  reconnect behavior, persistence races, authoritative empty results, and
  subagent refresh ordering
- document the updated synchronization, cache ownership, performance, and
  runtime-isolation invariants

packages/ui/src/components/views/TerminalView.tsx

@@ -615,9 +615,8 @@ export const TerminalView: React.FC<TerminalViewProps> = ({ visible }) => {
     const handleAttachSelection = React.useCallback(() => {
         const selection = terminalControllerRef.current?.getSelection();
         const sessionKey = currentSessionId ?? (newSessionDraft?.open ? 'draft' : null);
-        if (!selection || !sessionKey || !activeTab) return;
-        addContextDraft({
-            sessionKey,
+        if (!selection || !sessionKey || !activeTab || !effectiveDirectory) return;
+        addContextDraft({ directory: effectiveDirectory, sessionKey }, {
             source: 'terminal',
             fileLabel: activeTab.label,
             startLine: selection.startLine,
@@ -626,7 +625,7 @@ export const TerminalView: React.FC<TerminalViewProps> = ({ visible }) => {
             language: activeTab.terminalSessionId ?? activeTab.id,
             text: '',
         });
-    }, [activeTab, addContextDraft, currentSessionId, newSessionDraft?.open]);
+    }, [activeTab, addContextDraft, currentSessionId, effectiveDirectory, newSessionDraft?.open]);
 
     const handleSelectTab = React.useCallback(
         (tabId: string) => {