[bug] ix map can register duplicate or invalid workspace roots

[Hiro-Chiba]

Description

ix map derives workspace identity from the invocation path without first selecting and canonicalizing the repository root. Running it from a nested directory can register that directory as a second workspace, while a symlink to the same repository can produce another workspace ID. A nonexistent explicit path is registered before the command fails.

Steps to reproduce

1. Initialize a Git repository with a src subdirectory.
2. Run ix map from the repository root.
3. Change to src and run ix map without a path.
4. Run ix map through a symlink to the same repository.
5. Run ix map /tmp/path-that-does-not-exist.

Expected behavior

Without an explicit path, map uses the nearest registered workspace root or Git root. Workspace paths and lock keys use the canonical real path. Missing and non-directory paths fail before workspace registration.

Actual behavior

Nested and symlink paths can become separate workspaces for the same repository. A missing path can remain in configuration after map exits with an error.

CLI output

The workspace configuration contains multiple roots for one physical repository, or a root that does not exist.

Environment

• OS: macOS
• Node: 22.x
• Ix version: 0.10.5 and current main (3baa7dc)