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/check_buildbot_system.py

@@ -153,7 +153,7 @@ def print_report(report: dict) -> None:
 
 
 def update_changed(report: dict) -> list[str]:
-    """Refresh entries that have changed; the keys whose refresh failed."""
+    """Refresh entries that have changed and return the keys whose refresh failed."""
     failed: list[str] = []
     for e in report.get("entries", []):
         if e["status"] == "UPDATED" and e.get("key"):