Introduce health (hp) and damage handling to Robot/BaseRobot
interfaces. Add SmartBot implementation. Refactor bot mining and
movement to use new World APIs (mine, mineAllPositive,
sortPositiveValues). Simplify RandomBot, DigDeepBot, and SortBot
logic, rename/overhaul World rearrange/display, and fix several
indexing/logic bugs and minor cleanups.
Move UML PDF to doc/ and update .gitignore. Normalize includes,
whitespace and function signatures across headers/sources and add
concise class/function documentation. Fix RandomBot so the mine
limit is computed once and simplify DigDeepBot/SortBot mining logic.
Tidy World/Game initialization, error handling, and minor const/var
clarifications for readability and correctness
fegger