autoMemoryDirectory: default global memory dir still created each session

Bug

When autoMemoryDirectory is set in settings.local.json, Claude Code still creates an empty directory at the default global memory path (~/.claude/projects/<hashed-path>/memory/) at the start of each session.

Steps to reproduce

1. Set autoMemoryDirectory in .claude/settings.local.json to a project-local path (e.g. /path/to/project/.claude/memory).
2. Start a Claude Code session.
3. Observe that ~/.claude/projects/<hashed-path>/memory/ is created as an empty directory even though autoMemoryDirectory points elsewhere.

Expected behavior

When autoMemoryDirectory is set, the default global memory directory should not be created. The override should suppress the default path entirely.

Actual behavior

An empty directory is created at the default global path each session. It contains no files (writes correctly go to autoMemoryDirectory), but the phantom directory persists and must be manually removed.

Context

• Platform: macOS (Darwin 24.6.0)
• Shell: zsh
• Use case: keeping memory files version-controlled in the project repo rather than the global ~/.claude/ location