[Agent Builder] Add an Observability-specific agent builder page

[mdbirnstiehl]

Summary

Closes #4526. This PR adds Observability specific Agent Builder content and points users to the main docs. It also reorganizes the Observability AI information to allow for multiple AI uses.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Tool(s) and model(s) used: Cursor, claude 4.5 opus

[github-actions]

Vale Linting Results

Summary: 20 suggestions found

💡 Suggestions (20)

File	Line	Rule	Message
solutions/observability/ai/agent-builder-observability.md	27	Elastic.Clone	Use clone only when referring to cloning a GitHub repository or creating a copy that is linked to the original. Often confused with 'copy' and 'duplicate'.
solutions/observability/ai/agent-builder-observability.md	35	Elastic.Wordiness	Consider using 'remove' instead of 'Eliminate'.
solutions/observability/ai/observability-ai-assistant.md	30	Elastic.WordChoice	Consider using 'run, start' instead of 'execute', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	60	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	77	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	283	Elastic.Exclamation	Use exclamation points sparingly. Consider removing the exclamation point.
solutions/observability/ai/observability-ai-assistant.md	344	Elastic.WordChoice	Consider using 'run, start' instead of 'execute', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	365	Elastic.WordChoice	Consider using 'refer to (if it's a document), view (if it's a UI element)' instead of 'see', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	405	Elastic.FirstPerson	Avoid first-person pronouns such as ' I '.
solutions/observability/ai/observability-ai-assistant.md	435	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	450	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	455	Elastic.WordChoice	Consider using 'cannot' instead of 'unable', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	487	Elastic.WordChoice	Consider using 'refer to (if it's a document), view (if it's a UI element)' instead of 'See', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	498	Elastic.WordChoice	Consider using 'deactivated, deselected, hidden, turned off, unavailable' instead of 'disabled', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	506	Elastic.Semicolons	Use semicolons judiciously.
solutions/observability/ai/observability-ai-assistant.md	535	Elastic.Semicolons	Use semicolons judiciously.
solutions/observability/ai/observability-ai-assistant.md	565	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
solutions/observability/ai/observability-ai-assistant.md	575	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
solutions/security/ai/ai-assistant.md	48	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.
solutions/security/ai/ai-assistant.md	398	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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[github-actions]

🔍 Preview links for changed docs

• solutions/observability/ai/agent-builder-observability.md
• solutions/observability/ai/observability-ai.md
• contribute-docs/how-to/cumulative-docs/badge-placement.md
• deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md
• explore-analyze/ai-features.md
• explore-analyze/ai-features/ai-chat-experiences/ai-assistant.md
• explore-analyze/ai-features/llm-guides/connect-to-lmstudio-observability.md
• explore-analyze/ai-features/llm-guides/connect-to-vLLM.md
• solutions/elasticsearch-solution-project/ai-assistant.md
• solutions/observability/observability-serverless-feature-tiers.md

More links …

• solutions/security/ai/ai-assistant.md
• solutions/observability/ai/llm-performance-matrix.md
• solutions/observability/ai/observability-ai-assistant.md

[shainaraskas]

link updates on pages I own look fine ✅

[leemthompo]

✨

[florent-leborgne]

LGTM with Liam's comment