feat: Add documentation for project-level skills and their distinction from plugin skills

.claude/skills/CLAUDE.md

@@ -0,0 +1,29 @@
+# Project-Level Skills
+
+This directory contains skills **for developing and maintaining the claude-mem project itself**, not skills that are released as part of the plugin.
+
+## Distinction
+
+**Project Skills** (`.claude/skills/`):
+- Used by developers working on claude-mem
+- Not included in the plugin distribution
+- Project-specific workflows (version bumps, release management, etc.)
+- Not synced to `~/.claude/plugins/marketplaces/thedotmack/`
+
+**Plugin Skills** (`plugin/skills/`):
+- Released as part of the claude-mem plugin
+- Available to all users who install the plugin
+- General-purpose memory search functionality
+- Synced to user installations via `npm run sync-marketplace`
+
+## Skills in This Directory
+
+### version-bump
+Manages semantic versioning for the claude-mem project itself. Handles updating all four version files (package.json, marketplace.json, plugin.json, CLAUDE.md), creating git tags, and GitHub releases.
+
+**Usage**: Only for claude-mem maintainers releasing new versions.
+
+## Adding New Skills
+
+**For claude-mem development** → Add to `.claude/skills/`
+**For end users** → Add to `plugin/skills/` (gets distributed with plugin)