Feature: Per-project disable support

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Originally posted as issue #2752 by @ai-super-niko
#2752

Before submitting

• I searched existing issues and confirmed this is not a duplicate

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Is your feature request related to a problem? Please describe.

All claude-mem settings are currently global. I cannot disable memory capture or context injection for just one project. This is frustrating when I want claude-mem
active in most projects, but silent in specific ones — for example throwaway experiments, sensitive codebases, or projects where injected cross-project context adds
noise instead of value.

Describe the solution you'd like

Per-project disable support, ideally via one of:

1. A single environment variable like CLAUDE_MEM_ENABLED=false that fully disables both capture and injection when set. This works naturally with Claude Code's
   project-level .claude/settings.json env block.

2. An ignoredProjects array in ~/.claude-mem/settings.json:

   {
     "ignoredProjects": ["/Users/me/workspace/chat"]
   }
   Any session whose CWD matches an entry would skip both capture and injection.
   

3. A claude-mem disable / claude-mem enable CLI command that toggles the current project, writing to whichever of the above is chosen.

Describe alternatives you've considered

• Setting CLAUDE_MEM_CONTEXT_OBSERVATIONS=0 in project .claude/settings.json — works for suppressing injection, but capture still runs.
• Renaming ~/.claude/plugins/claude-mem@thedotmack to disable globally — too coarse, kills it for every project.
• Using tags — only excludes specific content, not whole projects.

None of these cleanly express "this project, off, both directions."

Additional context

Related Claude Code request for per-project plugin disable: anthropics/claude-code#62879. A claude-mem-side solution would unblock users today without waiting on
upstream.