Sync with the audited manuscript

The jammed OMA model now matches the transmit chain the paper
describes, the key-length sweep averages the eavesdropper over eight
substitute-key draws, and verify_math gains the coded-OMA outage
reference, symbolic checks of the three algebraic identities, and the
cross-period remainder of Proposition 2. The README records the energy
and channel conventions.

code/check_texhealth.py

@@ -1,49 +0,0 @@
-# -*- coding: utf-8 -*-
-"""Guard against mangled TeX control sequences.
-
-Shell heredocs silently turn a backslash escape into the control
-character it names, so \times becomes a tab followed by "imes" and \ref
-becomes a carriage return followed by "ef". LaTeX compiles both without
-an error and prints the wreckage, so the build log cannot catch this.
-This scan can.
-"""
-import re
-import sys
-from pathlib import Path
-
-TEX = Path(__file__).resolve().parents[1] / "main.tex"
-CTRL = {"\t": "TAB", "\r": "CR", "\x08": "BS", "\x0c": "FF",
-        "\x07": "BEL", "\x0b": "VT", "\x00": "NUL"}
-# a macro name shorn of its first letter, which is what the escape ate
-STUBS = ["ef{", "abel{", "ite{", "extbf{", "extit{", "ext{", "imes",
-         "rac{", "eft(", "ight)", "ho_", "elta", "psilon", "ambda",
-         "igma", "ewline", "otag", "uad", "nderline", "ag{", "egin{",
-         "nd{", "aption{", "ilde{", "ar{", "at{", "ec{"]
-PAT = re.compile("(?<![" + chr(92)*2 + "A-Za-z0-9])(" +
-                 "|".join(re.escape(x) for x in STUBS) + ")")
-
-
-def main():
-    if not TEX.exists():
-        print("  SKIP  tex health :: main.tex not in this package")
-        return 0
-    lines = TEX.read_text(encoding="utf-8").split("\n")
-    hits = []
-    for i, line in enumerate(lines, 1):
-        for ch, name in CTRL.items():
-            if ch in line:
-                hits.append("CTRL %s line %d: %r" % (name, i, line[:90]))
-        for m in PAT.finditer(line):
-            seg = line[max(0, m.start() - 30):m.start() + 30]
-            hits.append("STUB %r line %d: %r" % (m.group(1), i, seg))
-    for h in hits:
-        print("  FAIL  " + h)
-    if hits:
-        print("tex health: %d suspicious sequences" % len(hits))
-        return 1
-    print("  PASS  tex health :: no mangled control sequences")
-    return 0
-
-
-if __name__ == "__main__":
-    sys.exit(main())