v1.2.7 - Context injection and defensive improvements

What's Changed

• Simplify default config to only include schema URL (empty dcp.jsonc by default)
• Add defensive array checks for msg.parts iteration (prevents TypeError: {} is not iterable)
• Inject context as user message when last message is user (prunable tools list on every fetch)
• Show extracted token count in prune notifications

Full Changelog: v1.2.6...v1.2.7