Explicitly include DITA validation in docs-writer.md agent instructions

[GabiNecasova]

Description

While reviewing the documentation workflow in this repository, I noticed a slight disconnect between our available tools and the instructions provided to the docs-writer agent.

Current State:

• DITA rules are already configured in .vale.ini.
• There is a dedicated skill available: dita-validate-asciidoc.
• However, the docs-writer.md agent instructions mention running vale generally but do not specifically reference the DITA validation script or the necessity of DITA-safe conversion.

Proposed Change:

I suggest updating docs-tools/agents/docs-writer.md to explicitly include a DITA validation step. This ensures the agent is aware that content must be successfully convertible to DITA format and knows which script to run to verify this.

Proposed Content Addition:

## DITA validation
Run the DITA validation skill to check for DITA conversion issues:

bash dita-tools/skills/dita-validate-asciidoc/scripts/validate_asciidoc.sh /path/to/file.adoc

This validates against the AsciiDocDITA rules from https://github.com/jhradilek/asciidoctor-dita-vale to ensure the content can be successfully converted to DITA format. Fix all ERROR-level issues before saving.