Project path encoding breaks with non-ASCII (Cyrillic) directory names

Description

Claude Code encodes project paths by replacing / with - to create directory names under ~/.claude/projects/. However, non-ASCII characters (e.g. Cyrillic) in directory names are also replaced with -, making the encoding lossy.

Steps to reproduce

1. Create a project directory with a non-Latin name, e.g. ~/Documents/Проект
2. Start a Claude Code session in that directory
3. Look at ~/.claude/projects/

Expected behavior

The encoded directory name should uniquely and reversibly represent the original path.

Actual behavior

~/Documents/Проект is encoded as -Users-username-Documents------

Each non-ASCII character is replaced with -, so a 6-letter Cyrillic word becomes 6 dashes. This causes several problems:

• Collisions: Two different project directories with the same number of non-Latin characters (e.g. ~/Проект and ~/Привет) produce identical encoded names, potentially merging unrelated project data
• Unreadable: The ~/.claude/projects/ directory becomes impossible to navigate manually — all non-Latin projects look like sequences of dashes
• Non-reversible: The original path cannot be reconstructed from the encoded name

Suggested fix

Use a reversible encoding for non-ASCII characters (e.g. percent-encoding, or keep Unicode characters as-is in directory names) so the original path is always recoverable and unique.

Environment

• Claude Code version: 2.1.96
• OS: macOS (Darwin 25.3.0, arm64)