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.

.github/workflows/validate.yml

@@ -17,7 +17,7 @@ on:
       - "install.py"
       - "install.sh"
       - "install.ps1"
-  # Spelled out twice because the workflow parser reads no YAML anchor; a test
+  # Spelled out twice because the workflow parser reads no YAML anchor. A test
   # holds the two lists equal.
   push:
     branches: [main]
@@ -118,7 +118,7 @@ jobs:
         run: python scripts/validate_schemas.py --source-only
 
   # A profile written from a clone can cite lines that do not hold the value
-  # it declares; schemas and tests pass it. Each profile a change adds is
+  # it declares, and schemas and tests pass it. Each profile a change adds is
   # confronted with its upstream, both roads into main. An edited profile is
   # not held to it: the backlog of older refs is reviewed by hand.
   check-new-profiles:
@@ -141,7 +141,7 @@ jobs:
           BEFORE: ${{ github.event.before }}
         run: |
           # A pull request is checked out as a merge commit whose first
-          # parent is the base; a push names the commit it moved main from.
+          # parent is the base, while a push names the commit it moved main from.
           if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
             base=HEAD^1
           elif [ -z "$BEFORE" ] || [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then