docs: write prose without dashes or semicolons

Profiles, the wiki, comments, docstrings, command output and schema descriptions carried em-dashes, clause-joining semicolons, unicode arrows, box-drawing banners and check-mark glyphs. Each sentence was rewritten rather than having its character swapped. Hashes, paths, source_ref values and every cited file:line are unchanged, which a comparison of each parsed profile against the previous revision confirms.

validate_pr comments now say PASS and FAIL in words, and source_ref values in a profile's structured blocks render as code. test_prose_style fails if any of these comes back, in tracked files or in the generated site.

scripts/split_pack.py

@@ -225,7 +225,7 @@ def main() -> int:
     parser.add_argument("target", type=Path, help="a pack, or a directory of packs")
     parser.add_argument(
         "--max-size", type=_size, default=ASSET_LIMIT, metavar="SIZE",
-        help="a part stays under this many bytes (K, M, G suffixes; default 2G)",
+        help="a part stays under this many bytes (K, M, G suffixes, default 2G)",
     )
     args = parser.parse_args()
     # The packs are rewritten in place by generate_pack under this lock: a