feat: move to Claude's native memory management

Enable CLAUDE_CODE_DISABLE_AUTO_MEMORY=0 and
CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD=1 in container env so
agents use Claude Code's built-in persistent memory instead of
manually editing CLAUDE.md. Remove instructions that told agents to
write context into CLAUDE.md files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/container-runner.ts

@@ -108,7 +108,17 @@ function buildVolumeMounts(
   const settingsFile = path.join(groupSessionsDir, 'settings.json');
   if (!fs.existsSync(settingsFile)) {
     fs.writeFileSync(settingsFile, JSON.stringify({
-      env: { CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS: '1' },
+      env: {
+        // Enable agent swarms (subagent orchestration)
+        // https://code.claude.com/docs/en/agent-teams#orchestrate-teams-of-claude-code-sessions
+        CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS: '1',
+        // Load CLAUDE.md from additional mounted directories
+        // https://code.claude.com/docs/en/memory#load-memory-from-additional-directories
+        CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD: '1',
+        // Enable Claude's memory feature (persists user preferences between sessions)
+        // https://code.claude.com/docs/en/memory#manage-auto-memory
+        CLAUDE_CODE_DISABLE_AUTO_MEMORY: '0',
+      },
     }, null, 2) + '\n');
   }