chore: remove auto-generated per-directory CLAUDE.md files

Leftover artifacts from an abandoned context-injection feature. The
project-level CLAUDE.md stays; the directory-level ones were generated
timeline scaffolding that never panned out.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/CLAUDE.md

@@ -1,29 +0,0 @@
-# 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 three version files (package.json, marketplace.json, plugin.json), 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)