camel-jbang: Add tui_draw MCP tool for on-screen drawing overlay

[davsclaus]

Summary

• Add tui_draw and tui_draw_clear MCP tools that let AI agents draw characters at specific screen coordinates as an overlay on top of the TUI
• AI can highlight areas, annotate the screen for humans, draw shapes, or create fun emoji art (e.g. camel emojis)
• All cells sent in a single MCP call (no chatty networking) with support for auto-dismiss via duration parameter and append mode for composing drawings
• Drawing is a pure overlay -- tui_draw_clear restores the screen to its normal state instantly

New files

• DrawOverlay.java -- overlay that stores positioned cells and renders them on top of the TUI buffer, with auto-dismiss timer and color parsing

Modified files

• CamelMonitor.java -- integrate DrawOverlay into the render pipeline (after content, before captions)
• TuiMcpServer.java -- register tui_draw and tui_draw_clear tool definitions and handlers

Test plan

• Build: cd dsl/camel-jbang/camel-jbang-plugin-tui && mvn install -DskipTests
• Run camel tui monitor --mcp with an integration running
• Call tui_draw with cells at known positions and verify they appear
• Call tui_draw with emoji characters
• Call tui_draw_clear and verify drawing disappears
• Call tui_draw with duration and verify auto-dismiss
• Call tui_draw with append=true to add to existing drawing
• Verify tui_show_caption still renders on top of drawings

Claude Code on behalf of Claus Ibsen

🤖 Generated with Claude Code

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-plugin-tui

All tested modules (2 modules)

• Camel :: JBang :: Plugin :: TUI
• Camel :: Launcher :: Container

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