feat(06-01): add task_sessions CRUD, nativeContextManagement flag, TaskSessionRecord type

- Add getActiveTaskSession, incrementSessionUsage, archiveSession, createNewSession,
  getRecentRunsForTask, getRecentActivityForTask methods to AppDatabase
- Add nativeContextManagement optional boolean to ServerAdapterModule interface
- Set nativeContextManagement: true for claude_local and codex_local, false for gemini_local
- Add TaskSessionRecord interface to shared types
- Add unit tests for task_sessions CRUD and adapter exemption flags

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/shared/types.ts

@@ -317,6 +317,26 @@ export interface BudgetStatusSummary {
   }>;
 }
 
+export interface TaskSessionRecord {
+  id: string;
+  companyId: string;
+  taskId: string;
+  agentId: string;
+  adapterType: string;
+  sessionParamsJson: string | null;
+  sessionDisplayId: string | null;
+  lastRunId: string | null;
+  lastError: string | null;
+  runCount: number;
+  totalInputTokens: number;
+  totalOutputTokens: number;
+  rotatedAt: string | null;
+  rotationReason: string | null;
+  handoffMarkdown: string | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
 export interface ActivityRecord {
   id: string;
   companyId: string;