Recover agent-loop progress: lua/prolog/forth/erlang/haskell phases 1-2

Salvaged from worktree-agent-* branches killed during sx-tree MCP outage:
- lua: tokenizer + parser + phase-2 transpile (~157 tests)
- prolog: tokenizer + parser + unification (72 tests, plan update lost to WIP)
- forth: phase-1 reader/interpreter + phase-2 colon/VARIABLE (134 tests)
- erlang: tokenizer + parser (114 tests)
- haskell: tokenizer + parse tests (43 tests)

Cherry-picked file contents only, not branch history, to avoid pulling in
unrelated ocaml-vm merge commits that were in those branches' bases.

plans/erlang-on-sx.md

@@ -50,10 +50,11 @@ Core mapping:
 ## Roadmap
 
 ### Phase 1 — tokenizer + parser
-- [ ] Tokenizer: atoms (bare + single-quoted), variables (Uppercase/`_`-prefixed), numbers (int, float, `16#HEX`), strings `"..."`, chars `$c`, punct `( ) { } [ ] , ; . : :: ->`
-- [ ] Parser: module declarations, `-module`/`-export`/`-import` attributes, function clauses with head patterns + guards + body
-- [ ] Expressions: literals, vars, calls, tuples `{...}`, lists `[...|...]`, binaries `<<...>>`, `if`, `case`, `receive`, `fun`, `try/catch`, operators
-- [ ] Unit tests in `lib/erlang/tests/parse.sx`
+- [x] Tokenizer: atoms (bare + single-quoted), variables (Uppercase/`_`-prefixed), numbers (int, float, `16#HEX`), strings `"..."`, chars `$c`, punct `( ) { } [ ] , ; . : :: ->` — **62/62 tests**
+- [x] Parser: module declarations, `-module`/`-export`/`-import` attributes, function clauses with head patterns + guards + body — **52/52 tests**
+- [x] Expressions: literals, vars, calls, tuples `{...}`, lists `[...|...]`, `if`, `case`, `receive`, `fun`, `try/catch`, operators, precedence
+- [ ] Binaries `<<...>>` — not yet parsed (deferred to Phase 6)
+- [x] Unit tests in `lib/erlang/tests/parse.sx`
 
 ### Phase 2 — sequential eval + pattern matching + BIFs
 - [ ] `erlang-eval-ast`: evaluate sequential expressions
@@ -98,7 +99,8 @@ Core mapping:
 
 _Newest first._
 
-- _(not started)_
+- **parser green** — `lib/erlang/parser.sx` + `parser-core.sx` + `parser-expr.sx` + `parser-module.sx`. 52/52 in `tests/parse.sx`. Covers literals, tuples, lists (incl. `[H|T]`), operator precedence (8 levels, `match`/`send`/`or`/`and`/cmp/`++`/arith/mul/unary), local + remote calls (`M:F(A)`), `if`, `case` (with guards), `receive ... after ... end`, `begin..end` blocks, anonymous `fun`, `try..of..catch..after..end` with `Class:Pattern` catch clauses. Module-level: `-module(M).`, `-export([...]).`, multi-clause functions with guards. SX gotcha: dict key order isn't stable, so tests use `deep=` (structural) rather than `=`.
+- **tokenizer green** — `lib/erlang/tokenizer.sx` + `lib/erlang/tests/tokenize.sx`. Covers atoms (bare, quoted, `node@host`), variables, integers (incl. `16#FF`, `$c`), floats with exponent, strings with escapes, keywords (`case of end receive after fun try catch andalso orelse div rem` etc.), punct (`( ) { } [ ] , ; . : :: -> <- <= => << >> | ||`), ops (`+ - * / = == /= =:= =/= < > =< >= ++ -- ! ?`), `%` line comments. 62/62 green.
 
 ## Blockers