openplanr 1.2.0

Add agent-friendly non-interactive mode and API key UX improvements

• Add --yes/-y flag for fully unattended planning workflows (Claude Code, Cursor, Codex)
• Auto-detect non-interactive terminals via TTY detection
• All prompts return sensible defaults when non-interactive
• Add openplanr config remove-key command to delete stored API keys
• Show clear multi-line guidance when API key is not configured
• Detect existing API keys (env var, OS keychain, encrypted file) during init
• Replace magic numbers with named CHECKLIST constants
• Fix TOCTOU race condition in checklist reads

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.