Remove duplicate capability entry in capabilities.md

[Copilot]

docs/reference/capabilities.md contained duplicate IdLE.Identity.Attribute.Ensure entries—once under ### Identity and again under a redundant ### Identity attributes subsection.

Changes

• Removed redundant ### Identity attributes subsection (lines 71-76)
• Retained single IdLE.Identity.Attribute.Ensure definition under ### Identity section
• All 16 capabilities now unique

The file is manually maintained (not generated), so no generator updates needed.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Deduplicate capability entry in docs/reference/capabilities.md</issue_title>
<issue_description>## Problem Statement

docs/reference/capabilities.md contains a duplicated capability entry. This is a small but visible consistency defect that can confuse users and implies missing editorial validation in documentation pages.

Proposed Solution

• Remove the duplicate capability entry.
• Ensure the final capability list is unique and consistently formatted.
• If capabilities are generated from source, fix the generator/source-of-truth instead of editing generated output manually.

Alternatives Considered

• Leaving the duplicate in place.
  • Rejected: contradicts the consistency principle and reduces documentation quality.

Impact

• Does this affect existing workflows?
  • No runtime impact.
• Any backward compatibility concerns?
  • None.

Acceptance Criteria:

• The duplicate entry is removed and the document remains valid Markdown (linting).
• If docs are generated, the duplication is fixed at the source/generator level so it cannot regress.

Additional Context

Verification:

• Run any existing docs lint/check pipeline locally or via CI.

Definition of Done:

• Doc fixed at the correct layer (source-of-truth).
• Optional: add a small docs check (unique headings/ids) only if trivial and aligned with existing tooling.
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Deduplicate capability entry in docs/reference/capabilities.md #181

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[Copilot]

Pull request overview

Removes a duplicated capability entry in the IdLE capability catalog documentation to keep the list unique and avoid confusion for readers.

Changes:

• Removed the redundant ### Identity attributes subsection that duplicated IdLE.Identity.Attribute.Ensure.
• Kept the single canonical IdLE.Identity.Attribute.Ensure entry under ### Identity.