[FEATURE] Cloud-synced memory and settings across machines

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Allow Claude Code memory and user preferences to sync across
machines when logging in with the same Anthropic account.

Proposed Solution

Use Case / Motivation:
Currently, memory files are stored locally in ~/.claude/memory/
on each machine. This means:

• Setting up guidelines on Mac doesn't sync to Ubuntu
• Cross-machine setup is manual and error-prone
• Global preferences can't follow the user across devices

With cloud sync, I could set once and have it available on:

• Mac development machine
• Ubuntu server on LAN
• Future machines with same login

Expected Behavior:

1. User sets global memory/settings on one machine (e.g., Mac)
2. Logs into Claude Code on another machine (e.g., Ubuntu) with same account
3. All memory and preferences automatically available
4. Changes sync bidirectionally across devices

Alternative Solutions

Current Workaround:

• Manually recreate memory files on each machine
• Store guidelines in git repos (CLAUDE.md files)
• Use cloud storage symlinks (fragile, OS-dependent)

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

Use Case / Motivation:
Currently, memory files are stored locally in ~/.claude/memory/
on each machine. This means:

• Setting up guidelines on Mac doesn't sync to Ubuntu
• Cross-machine setup is manual and error-prone
• Global preferences can't follow the user across devices

With cloud sync, I could set once and have it available on:

• Mac development machine
• Ubuntu server on LAN
• Future machines with same login

Additional Context

_No response_