Initial release of the transport-investigation-acas-aligned-pack skill.

• Generates ACAS-aligned investigation invite letters, neutral question plans, and evidence log templates for transport incidents.
• Ensures outputs are suitable for investigation (fact-finding) stages, not for disciplinary outcome drafting.
• Outputs include Word-ready invite, question sets, and Excel-ready evidence log with chain of custody fields.
• Mandates neutral language, right-to-be-accompanied wording, and clear evidence handling per ACAS guidance.
• Advises users when HR/legal review may be required and requests clarification if the process stage is unclear.