Enforce project name in some settings fole

[github-actions[bot]]

Originally posted as issue #551 by @mpasternak
#551

Is your feature request related to a problem? Please describe.
I want to use git worktrees.

claude-mem thinks I am working on a different project, because directory name is changed.

Describe the solution you'd like
I want to be able to specify common project name for all my worktrees, for example in a file like ".project" or something else.

Describe alternatives you've considered
No idea, GPT suggests changing code of claude-mem :-)

Additional context
None.

[mpasternak]

Silly me... is it enough to setenv CLAUDE_MEM_PROJECT ?