fix: settle the Count and Sheet Set merge

- Both PRs registered "Requires an integer between {min} and {max}." under
  their own key; keep the sheet set one, which every locale translates.
- Pin the MCP tool schema digest with the sheet set actions added.
- searchable_layer_coexists_with_outlines read glyph outlines from the
  shared atlas while other tests could re-bake it, and failed now and
  then; lay out and export under one atlas generation.

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

src/locale_catalog.rs

@@ -5719,7 +5719,6 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "count area is active." => Some(("count-feature", "area-active")),
         "{name} = {v} (read only)" => Some(("count-feature", "read-only-value")),
         "Requires 0 or 1 only." => Some(("count-feature", "requires-0-or-1")),
-        "Requires an integer between {min} and {max}." => Some(("count-feature", "requires-int-range")),
         "{name} ...... {n}" => Some(("count-feature", "target-count")),
         "MTEXT Current text style:  \"{}\"  Text height:  {:.4}" => Some(("count-feature", "mtext-current-style")),
         "{found} field(s) found." => Some(("count-feature", "fields-found")),