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/generate_truth.py

@@ -81,7 +81,7 @@ def main(argv: list[str] | None = None) -> None:
     profiles = load_emulator_profiles(args.emulators_dir)
 
     # Load database (optional)
-    # The default may be absent; a --db that was named must exist.
+    # The default may be absent, but a --db that was named must exist.
     db: dict | None = None
     if args.db != DEFAULT_DB_FILE or os.path.exists(args.db):
         db = load_database(args.db)