CAS v1.0

• Bump version to 1.0.0
• Remove .env.example in favor of .env.worktree.template
• Sync .claude rules/skills after cas update and add MCP config
• Fix unused Content import warning when mcp-proxy feature is disabled
• Fix m165 migration crash when verifications table doesn't exist
• Remove duplicate install.sh and trim Quick Start
• Add factory TUI screenshot to README header
• Fix release workflow: move secret check from job-level if to step script
• CI: use default features only, add homebrew conditional
• Fix release workflow: use GITHUB_TOKEN, add homebrew auto-update