[WIP] Update agent framework workflows documentation after upstream change

[Copilot]

• Update references/official-docs/tutorials/workflows/simple-sequential-workflow.md to reflect the new orchestrations-sequential content now served at that URL
• Update references/workflows.md to note AgentWorkflowBuilder.BuildSequential() is now the featured sequential API
• Update references/examples.md sequential workflow row to reflect updated tutorial source
• Bump SKILL.md version to 1.5.0
• Validate catalog with generate_catalog.py --validate-only
• Code review and security scan

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upstream update: learn.microsoft.comagent-framework/tutorials/workflows/simple-sequential-workflow documentation documentation changed</issue_title>
<issue_description>Automation detected an upstream change for learn.microsoft.comagent-framework/tutorials/workflows/simple-sequential-workflow documentation.

• Watch id: agent-framework-docs-tutorials-workflows-simple-sequential-workflow
• Kind: http_document
• Source: https://learn.microsoft.com/agent-framework/tutorials/workflows/simple-sequential-workflow
• Current value: "CIHYB6xFo9gG1y1bGhGG6iqwaIY="
• Previous value: "loetUtQ48pr0I7+wjXOxYk0p01Q="

Observed detail:

• Microsoft Agent Framework Workflows Orchestrations - Sequential | Microsoft Learn | ETag "CIHYB6xFo9gG1y1bGhGG6iqwaIY="

Why this matters:

• Review the linked skills when https://learn.microsoft.com/agent-framework/tutorials/workflows/simple-sequential-workflow changes.

Likely skills to review:

• dotnet-microsoft-agent-framework

Suggested follow-up:

• Review the upstream release notes or documentation diff
• Update the affected files under skills/
• Update README.md if framework coverage or guidance changed
• Close this issue after the catalog has been refreshed

<agent_instructions>Review all tasks and if needed make jsut one pr an done branch with all updates for skills and docs </agent_instructions>

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

• Fixes Upstream update: learn.microsoft.comagent-framework/tutorials/workflows/simple-sequential-workflow documentation documentation changed #5

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