Add Audit Trail Tool for decision timeline generation

[arjunkotwal-del]

Description

Add an Audit Trail Tool to generate chronological decision timelines from agent runs
for analysis, debugging, and documentation.

Motivation

Developers need visibility into agent decision-making to debug behavior and
understand reasoning paths.

Scope

• Generate audit trail for a given run (JSON + Markdown)
• List available runs in runtime storage
• Proper error handling and validation
• Unit tests + documentation

Acceptance Criteria

• Tool follows existing MCP tool patterns
• Supports structured and human-readable output
• Includes tests

[github-actions]

Found a possible duplicate of #1412: Both issues request the same Audit Trail Tool feature for generating chronological decision timelines from agent runs with identical scope (JSON + Markdown output, run listing, error handling, tests).

If you believe this issue adds unique context or requirements not covered in #1412, please react with a thumbs-down and provide additional details.

[shruti2522]

Hi, I would like to work on this