mistral CLI v0.4.1

Added

• mistral apps capability (init, add, update, remove) now 3-way merges
  each generated file instead of overwriting it, so manual edits to Helm values,
  compose overlays, route aggregators, and apps/*/pyproject.toml survive the
  next wire operation. Unresolvable overlaps are written as conflict markers
  rather than silently discarded.
• mistral apps capability merge [--continue | --abort] reconciles the generated
  files left in conflict by a merge.

Fixed

• CLI reference docs now include the fully gated skills, prompts, and evals
  command groups. Root command groups are always registered and disabled ones are
  filtered at runtime, so the reference generator sees them.
• Feature-flag docs use the real mistral_cli_ gate-key prefix and cover the
  ai-registry and evals disciplines; the snapshot filename, refresh budget,
  identity-hash contents, and ungated-command list are corrected.