skills(query): delete the planned-eval stub and drop its ceiling row

#14296 item 2 = A (comment 5507419465): the planned-eval stubs are
deleted and their ceilings step down; real fixtures stay. Deletes
skills/objectstack-query/evals/README.md (558-token stub of nine
"Planned Evals" scenarios never built) and drops its row from
scripts/check-skills-token-ratchet.mjs -- the only edit to that
script this flight makes.

Fixes #14302, round 2.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LraLgQVGq8egUwfYZpbYt1

Author: claude

scripts/check-skills-token-ratchet.mjs

@@ -425,7 +425,6 @@ export const CEILINGS = new Map([
   ['skills/objectstack-platform/rules/service-registry.md', 2331],
 
   // objectstack-query
-  ['skills/objectstack-query/evals/README.md', 567],
   ['skills/objectstack-query/rules/aggregation.md', 2357],
   ['skills/objectstack-query/rules/filters.md', 2149],
   ['skills/objectstack-query/rules/pagination.md', 1382],