v0.4.0

Changelog

• 0821b49 feat: add MEMORY.md loading and system prompt injection
• 6952e11 feat: add missing Anthropic and OpenAI models to catalog
• 3d8d92a feat: add per-model pricing to catalog and display in UI
• 4eeb036 feat: execute tool calls in parallel instead of sequentially
• d48579c feat: improve MEMORY.md system prompt with detailed use case explanation
• b38806a feat: instruct LLM to prefer parallel tool calls for independent operations
• a46946d fix: add nil-safety checks for GetPart in tool result processing
• 22c3013 fix: always inject MEMORY.md instructions in system prompt
• e204b03 fix: bump version references from 0.3.0 to 0.3.1 to match git tag
• 2d8b1a8 release: bump version to v0.4.0 with release notes