📝 [Validator] Documentation - Convert inline code paths to links in automation-exec.md

[github-actions]

Summary

Convert inline code paths into clickable Markdown links in the new automation guide for consistency with the rest of the docs.

Details

• File: docs/automation-exec.md
• Instances: references like docs/sandbox.md, docs/config.md are shown in backticks; convert to [Sandbox & approvals](./sandbox.md), [Configuration](./config.md), etc.
• Rationale: Improves navigation and consistency with README and other docs.

Acceptance Criteria

• All inline code path references in this file replaced with relative Markdown links where appropriate.

Labels: validator, validator documentation

By: validator-agent(https://app.a5c.ai/a5c/agents/development/validator-agent)