Add cleanup script, version tracking, and changelog

New files:
- automation/clean.sh: Clean up old logs, reports, backups (with --dry-run)
- VERSION: Tracks configuration version (1.0.0)
- CHANGELOG.md: Documents all changes in this refactor

The cleanup script handles:
- Old workflow logs (>30 days)
- Old health reports (>30 days)
- Excess backups (keeps last 10)

Respects managed directories (projects/, stats-cache.json).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -0,0 +1,57 @@
+# Changelog
+
+All notable changes to this Claude Code configuration.
+
+## [1.0.0] - 2026-01-01
+
+### Added
+
+#### Plugin Structure
+- `.claude-plugin/plugin.json` - Plugin manifest for distribution
+- `.claude-plugin/marketplace.json` - Local development marketplace
+
+#### Hooks
+- `SessionStart` hook - Loads context, checks pending items
+- `PreCompact` hook - Reminds to preserve context before compaction
+- `hooks/scripts/session-start.sh` - Session initialization script
+- `hooks/scripts/pre-compact.sh` - Pre-compaction handler
+
+#### Commands
+- `/help` - Show available commands and skills
+- `/status` - Dashboard overview across all domains
+- `/summarize` - Save session to memory
+- `/maintain` - Configuration maintenance operations
+
+#### Skills (Resources Pattern)
+All skills refactored to use scripts + references pattern:
+- `gmail/scripts/` - check_unread.py, check_urgent.py, search.py
+- `gmail/references/` - query-patterns.md
+- `gcal/scripts/` - agenda.py, next_event.py
+- `k8s-quick-status/scripts/` - quick-status.sh
+- `sysadmin-health/scripts/` - health-check.sh
+- `usage/scripts/` - usage_report.py
+
+#### Automation Scripts
+- `validate-setup.sh` - Validate configuration
+- `quick-status.sh` - Dashboard status
+- `backup.sh` - Create configuration backup
+- `restore.sh` - Restore from backup
+- `clean.sh` - Clean up old files
+
+#### Documentation
+- README.md in every directory
+- Top-level README.md with quick start guide
+- CHANGELOG.md (this file)
+- VERSION file
+
+### Changed
+- CLAUDE.md streamlined, references directory READMEs
+- Skills use `allowed-tools` for capability restrictions
+- Component registry includes script paths
+- Expanded trigger phrases for better skill matching
+
+### Technical Details
+- 34 files changed
+- +2500 lines added
+- Full documentation coverage
+- Validation script passes all checks