Update agent-builder temporary explicit license string

[Copilot]

Update the agent-builder license requirement notice to clarify that Enterprise subscription applies to {{ech}} or self-managed deployments.

Changes:

• Replaced 5 instances across 4 files in explore-analyze/ai-features/
• Changed "Enterprise [license]" to "Enterprise [subscription] for {{ech}} or self-managed deployments"

Files modified:

• agent-builder/permissions.md
• agent-builder/get-started.md
• agent-builder/limitations-known-issues.md (2 instances)
• elastic-agent-builder.md

Before:

{{agent-builder}} requires an **Enterprise** [license](/deploy-manage/license.md).

After:

{{agent-builder}} requires an **Enterprise [subscription](/deploy-manage/license.md)** for {{ech}} or self-managed deployments.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[agent builder] update temporary explicit license string</issue_title>
<issue_description>Find all the pages under explore-analyze/ai-features/ with the following string:

{{agent-builder}} requires an **Enterprise** [license](/deploy-manage/license.md)..

Replace with:

{{agent-builder}} requires an **Enterprise [subscription](/deploy-manage/license.md)** for non-serverless deployments.
</issue_description>

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

• Fixes [agent builder] update temporary explicit license string #4638

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[leemthompo]

@copilot replace "for non-serverless deployments" with "for {{ech}} or self-managed deployments"

[Copilot]

@copilot replace "for non-serverless deployments" with "for {{ech}} or self-managed deployments"

Updated in commit 02b22f9. Replaced "for non-serverless deployments" with "for {{ech}} or self-managed deployments" across all 5 occurrences in the 4 files.

[github-actions]

✅ Vale Linting Results

No issues found on modified lines!

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[github-actions]

🔍 Preview links for changed docs

• explore-analyze/ai-features/agent-builder/get-started.md
• explore-analyze/ai-features/agent-builder/limitations-known-issues.md
• explore-analyze/ai-features/agent-builder/permissions.md
• explore-analyze/ai-features/elastic-agent-builder.md

[leemthompo]

LGTM, reminder to passersby that we can remove the explicit mention after 9.3 releases :)