- Added stripInternalArgs() utility function to filter harness-internal keys from tool arguments.
- Hidden agent__intent parameter from UI and log displays across agent, session, MCP, and tool-execution components.
- Implemented HIDDEN_ARG_KEYS constant to centrally manage internal argument filtering.
- Updated formatArgsInline() to exclude internal keys when rendering tool arguments.
- Extracted JSON tree rendering utilities into dedicated module for reuse across tool renderers.
- Moved formatArgsInline, renderJsonTreeLines, and related constants from mcp/render.ts to tools/json-tree.ts.
- Updated tool-execution.ts to import and use shared JSON tree rendering functions.
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