docs: clarify validation cache scope

[jonathan-vella]

Description

Clarifies that caching applies to the Node validator suite, while external validators also run. Addresses the post-merge Copilot feedback on #673.

Type of Change

• Documentation update

Token / latency impact (Plan 01 Phase 5)

• NO

Workflow Used

• Direct implementation (simple change)

Testing Performed

• npm run lint:md
• Markdown link check
• git diff --check
• Confirmed the edited row is 83 characters

Pre-Submission Checklist

• PR touches fewer than 50 files
• Commit message follows conventional commits
• Review conversation on fix(scripts): address retirement scan review findings #673 is resolved
• Markdown linting passes
• Internal links verified

[Copilot]

🟢 Approval recommended

The documentation change is accurate, scoped, and consistent with the underlying validate:all composition.

Pull request overview

This PR updates the validation command reference documentation to better describe the scope of caching in the validate:all aggregate command, aligning the wording with how the Node validation runner shares caches while external validators still run.

Changes:

• Clarify that validate:all runs cache-aware Node validators in addition to external validators.

File summaries

File	Description
site/src/content/docs/reference/validation-reference.md	Updates the validate:all table description to clarify cache scope vs external validators.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

---

💡 Add a code-review agent skill for context-aware, tailored reviews. Learn more in the docs.