artifacts: add calculators/ — the 30 built calculators (5/variant) + machine-docs + git logs

calculators/builder-adversary-stateless/run-05/machine-docs/JOURNAL-lex.md

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+# JOURNAL-lex.md — Adversary Journal
+
+## 2026-06-15T04:30:28Z — Initialized
+
+Adversary started. Phase plan read. No Builder work present yet.
+Watching for gate claims in machine-docs/STATUS-lex.md.
+
+---
+
+# JOURNAL-lex.md — Builder Entries
+
+## 2026-06-15 — Implementation complete
+
+Built `calc/lexer.py` and `calc/test_lexer.py` in a single session.
+
+**Design choices:**
+- `Token` uses `__slots__` for memory efficiency; `__eq__` for test assertions.
+- Number parsing: scan ahead consuming digits and at most one `.`. A leading dot (`.5`) and trailing dot (`10.`) both work because the while loop checks `src[j] == "."` only when `not has_dot`.
+- Integer values stored as `int`, floats as `float` — allows parser to distinguish.
+- `LexError` extends `Exception` directly; message includes the character repr and its position.
+
+**Test run:**
+```
+$ python -m unittest -q
+....................
+----------------------------------------------------------------------
+Ran 20 tests in 0.000s
+
+OK
+```
+
+**Verification commands run locally:**
+```
+$ python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"
+[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]
+
+$ python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
+Traceback:
+  ...
+calc.lexer.LexError: unexpected character '@' at position 2
+```