feat(version): commands tree and default usage

[Traqueur-dev]

✨ New Features

• Hierarchical Command Tree
  Introduced CommandTree<T, S> and CommandNode<T, S> to manage commands in a prefix-tree (trie) structure:

  • Register commands and subcommands by full path (e.g. "parent.child.grandchild")
  • Efficient lookup via findNode(base, rawArgs), which returns the deepest matching node and leftover args
  • Flexible removal (removeCommand(label, prune)) to either clear a single node or prune an entire subtree

• Improved Default Usage Generation
  Refactored generateDefaultUsage(...) to display only a single level of subcommands alongside required and optional arguments:

  1. Full command path (/parent child …)
  2. Direct subcommands in <sub1|sub2>
  3. Required args <arg> and optional args [opt]

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🛠 Changes & Migration Notes

• Command Tree Replaces Flat Map

  • All command registrations now go through the CommandTree internally.
  • Subcommand lookups and tab-completion should use findNode(...) instead of a flat Map<String, Command>.

• Usage Format Update

  • Only first-level subcommands are shown in the autogenerated usage string.
  • Tests or custom parsers relying on the old, multi-level usage format may need updating.