v0.3.0

Added

• animfx.setup(config) registers effects declaratively — a table mapping
  events to an effect or a list of them. Re-running replaces its own
  registrations without affecting on() calls.
• effects.range_flash highlights an arbitrary column-aware range, falling
  back to the '[ / '] change marks; clamps out-of-range coordinates.
• animfx.sources — curated, opt-in adapters that emit animfx events from
  Neovim happenings. First source: on_yank() (emits "Yank" with the yanked
  range). Combined with range_flash, this reimplements yank highlighting
  through the registry (see examples/yank-highlight.lua).
• effects.blink (flash a line on/off N times) and effects.virt_badge
  (end-of-line virtual-text label that clears after a duration).
• animfx.enable() / animfx.disable() / animfx.is_enabled() global switch.
  Effects are also skipped during macro record/replay by default
  (vim.g.animfx_animate_in_macros opts back in).
• More sources: sources.on_diagnostic() (emits "Diagnostic" with
  { buf, count }) and sources.on_search() (wraps n/N, emits "Search"
  with the landing position).
• effects.shake — jitters a floating cue at the cursor (best-effort error
  feedback; Neovim can't move a non-floating window).
• sources.on_harpoon() — the motivating integration: emits "HarpoonAdd"
  when a file is added to a harpoon list (v2), no-op if harpoon is absent.
  See examples/harpoon-add.lua. Verified against real harpoon in the
  integration suite.