fix(ci): llms-full.txt over size budget — drop what-schemas-unlock from full bundle

The toolLoop + budget bug-fix annotations grew CLAUDE.md, pushing llms-full.txt
to 756KB over the 750KB FULL_SIZE_BUDGET (the `build-llms > size budget` test
failed, failing the `test` CI job). CLAUDE.md stays inlined by design (it's the
point of the one-fetch bundle), so per the budget comment's own guidance ("ship
with includeInFull=false exclusions") this excludes docs/what-schemas-unlock.md
(15.4KB value-explainer, not load-bearing operational reference) from
llms-full.txt; it stays linked in llms.txt. Bundle now 740KB with ~9KB headroom.
No budget bump — 750KB is near the ~190k-token-context fit ceiling.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/llms-config.ts

@@ -87,6 +87,11 @@ export const SECTIONS: DocSection[] = [
         includeInFull: false,
       },
       {
+        // Excluded from llms-full.txt (stays linked in llms.txt) to keep the
+        // single-fetch bundle under FULL_SIZE_BUDGET as CLAUDE.md grows. This is
+        // a value-explainer, not load-bearing operational reference for an agent
+        // reading the bundle — the right thing to link rather than inline.
+        includeInFull: false,
         title: "docs/what-schemas-unlock.md",
         description:
           "Why schemas matter: 7 killer use cases (4000 invisible meetings, founder ops brain, research brain, legal brain, team brain, agent-as-co-curator) + the structural argument for typed page kinds. Read this before pitching schema authoring (v0.40.7.0).",