docs(skills): drop the bootstrap example's added prose line, which the published-skills token ceiling does not fund

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01REMuzhz6MWRjg8uohedMnM

Author: claude

.changeset/25666-skills-bootstrap-exact-pins.md

@@ -6,4 +6,4 @@ docs(skills): the objectstack-platform bootstrap example pins every `@objectstac
 
 Clause-②: no
 
-The 〈Complete Working Example〉 `package.json` in `objectstack-platform/references/bootstrap.md` gave `^17.0.0` for its five `@objectstack/*` packages, a major behind and a caret range the v18 docs advise against. It now gives `18.1.0` for each, and one sentence says `create-objectstack` writes every `@objectstack/*` dependency as its own version, exactly, so all of them stay on one version.
+The 〈Complete Working Example〉 `package.json` in `objectstack-platform/references/bootstrap.md` gave `^17.0.0` for its five `@objectstack/*` packages, a major behind and a caret range the v18 docs advise against. It now gives `18.1.0` for each, the exact form `create-objectstack` writes, with all of them on one version.

skills/objectstack-platform/references/bootstrap.md

@@ -156,9 +156,6 @@ A minimal but complete project from scratch:
 }
 ```
 
-`npx create-objectstack` writes every `@objectstack/*` dependency as its own version, exactly (no
-caret) — keep all `@objectstack/*` packages on that one version.
-
 **`src/objects/task.object.ts`** — one `ObjectSchema.create({ … })` call. Field
 types, `indexes:` and the rest of the object surface are **objectstack-data**'s;
 the scaffolder's own `note.object.ts` is the shape to copy.