Phase 3: Stabilization (checkhealth, tests, docs)

[Schmarvinius]

Minimum non-functional work to keep the expanded plugin stable and maintainable.

Tasks

• :checkhealth nvim-ask delegating to backend.health() (claude on PATH, version, Neovim >= 0.9).
• Tests (plenary/busted) for:
  • parser multi-block extraction (Phase 0)
  • prompt builder
  • backend registry (Phase 1)
• README updates: new config keys, diff-apply flow, multi-turn, presets, context providers.

Notes

Can proceed incrementally alongside Phases 1-2; checkhealth depends on the backend.health() interface from Phase 1.