Addresses:

• Allow agents/subagents to load and remove MCP servers #554
• Stack trace when syntax errors in conf file #576

Includes:

• Add /hot-reload command that can live reload configuration and preserve current conversation
• Fix adjacent replace operations merging onto one line
• Small TUI updates, ctrl+c when text is selected, copies it, and when not selected cancels the current prompt
• Allow agents and subagents to have distinct sets of MCP servers active
• Remove insert from EditText tool since it can be accomplished with replace and it confuses models which to use when
• ReadRange tool to count tokens in snippet not lines for decision logic on what to show LLM
• Let LiteLLM manage github copilot provider headers