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/main/connectors.ts

@@ -57,6 +57,7 @@ const CONNECTORS: ConnectorDefinition[] = [
       execute: codexExecute,
       testEnvironment: codexTestEnvironment,
       sessionCodec: codexSessionCodec,
+      nativeContextManagement: true,
       models: codexModels,
     },
     listModels: async () => codexModels,
@@ -81,6 +82,7 @@ const CONNECTORS: ConnectorDefinition[] = [
       execute: claudeExecute,
       testEnvironment: claudeTestEnvironment,
       sessionCodec: claudeSessionCodec,
+      nativeContextManagement: true,
       models: claudeModels,
     },
     listModels: async () => claudeModels,
@@ -105,6 +107,7 @@ const CONNECTORS: ConnectorDefinition[] = [
       execute: geminiExecute,
       testEnvironment: geminiTestEnvironment,
       sessionCodec: geminiSessionCodec,
+      nativeContextManagement: false,
       models: geminiModels,
     },
     listModels: async () => geminiModels,