Added

• pslua is now a first-class Spago backend. With
  workspace.backend.cmd: pslua in spago.yaml, spago build links the
  project to Lua, and a new --run <Module>.<entry> flag lets spago run and
  spago test compile an entry point, execute it with lua, and forward the
  interpreter's exit code (#117).
• Projects consume the published Lua package set through
  workspace.packageSet.url in spago.yaml: the PureScript Registry baseline
  with the Lua FFI forks overlaid.

Changed

• Migrated the toolchain to the current Spago (spago.yaml + spago.lock and
  the PureScript Registry), replacing the Dhall-based configuration (#55).
• Deeply nested Effect/ST do-blocks (magic-do) and other deep monadic
  spines are flattened so the generated Lua stays under the interpreter's
  syntactic nesting limit (#46, #104, #108).
• The Nix toolchain moved to purescript-overlay for a pinned purs
  0.15.16 and Spago 1.0.4 (#54).

Fixed

• De Bruijn indices are lowered correctly when a binder is removed, closing a
  class of silent miscompilations (#56).
• Eta reduction no longer rewrites programs unsoundly (#32); shift,
  substitute, and free-reference counting now respect sequential Let
  scoping (#37).
• Array-literal pattern binders read 1-based Lua indices instead of 0-based
  (#49).
• Char literals are escaped correctly, and table literals are parenthesised
  before they are indexed.
• The parent directory of --lua-output-file is created when it is missing
  (#61).