feat(ci): drop the dot between the category glyphs and the role title

Job and run titles read `🐳🧅…𓏴𓏛·Nextcloud#2`; the `·` between the
hieroglyph block and the title only costs width. RoleDisplayName.encode
now joins the two directly (`𓏴𓏛Nextcloud#2`). Spaces inside a README
heading still become `·`, which keeps a display name one token in the
space-separated whitelist and priority inputs.

decode and decode_list still map the dotted form of older runs back to
the role id, so report_failures, the run tooling and selection tokens
pasted from an earlier run keep working. Old and new names cannot
collide: a glyph block holds only hieroglyphs and a title starts with a
letter.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

utils/github/variant/selection.py

@@ -12,7 +12,7 @@ the architecture on both lines.
 Two spellings are accepted, so an operator can either type the token or paste
 back the job title of the run they want repeated:
 
-* the job label CI emits (``🐝🧅🚇🌀🦓🦾𓏴𓏛·Nextcloud#2``) -- the glyphs carry
+* the job label CI emits (``🐝🧅🚇🌀🦓🦾𓏴𓏛Nextcloud#2``) -- the glyphs carry
   mode, network mode, mesh state, distro, filesystem and architecture, the
   ``#`` shard the variants;
 * an ASCII form (``web-app-nextcloud#0,2@swarm+tor%debian/zfs:arm64&vpn``).