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/mcp.rs

@@ -29,7 +29,7 @@ const MODERN_PROTOCOL_VERSION: &str = "2026-07-28";
 /// changes, so schema drift (new params, renamed tools) is always a conscious,
 /// reviewed edit — and clients can detect a stale bridge by comparing digests.
 #[cfg(test)]
-const TOOL_SCHEMA_DIGEST: &str = "537fd4e77a61b9333f21dcd294b6c91b338884acc9cd2964cbb74855821cfa12";
+const TOOL_SCHEMA_DIGEST: &str = "bbecd61a9295ecd8e3fefe6a223252107d80d173da7544edacaa2880139683ad";
 const MAX_REQUEST: usize = 1_048_576;
 const MAX_RESPONSE: u64 = 16 * 1024 * 1024;
 const CACHE_TTL_MS: u64 = 3_600_000;