v0.2.0

Added

• OpenSpec specs under openspec/ documenting v0.1.0 behavior across five
  capabilities (registry, effects, combinators, introspection, remote).
• Spec-to-test traceability: every test is tagged with the requirement it
  covers, and a coverage gate fails the build on dangling references or
  uncovered requirements.
• CONTRIBUTING.md describing the spec-driven loop and traceability rule.
• Backend-integration suite (make test-integration) that installs a real
  nvim-notify and verifies the adapters, the remote bridge end-to-end, and the
  health check.
• This changelog and a release workflow that cuts a GitHub release from the
  matching changelog section on tag push.
• lua-language-server type-checking of the LuaCATS annotations (.luarc.json,
  make typecheck, CI job); delegate's spec is now a typed
  animfx.DelegateSpec class.
• animfx.clear(event) removes all effects for an event, or every animfx
  registration when called with no argument.
• Vim help documentation (:help animfx, doc/animfx.txt).

Changed

• The unit suite now runs with nvim --clean so results don't depend on the
  user's config.

Fixed

• line_flash/sign_flash now clamp an out-of-range data.line into the
  buffer instead of raising (e.g. when data.buf is set but data.line falls
  back to a longer buffer's cursor line).
• Concurrent line_flash({ fade = true }) invocations no longer share global
  highlight groups, so overlapping fades with different colors don't overwrite
  one another mid-animation.
• delegate now warns once (via vim.notify) when the module loads but the
  fn path isn't callable, instead of silently doing nothing.
• Animated effects (line_flash fade, cursor_beacon) now cancel their
  repeating timers on VimLeavePre, so none leak or fire a callback into a
  closing Neovim.