[mkirk111]

Release notes for quality of life mutational signature improvements.

[stjudecloud-cloudy]

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[Copilot]

🟢 Approval recommended

The documentation changes are internally consistent, with no identified blocking issues.

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What changed in this PR

This documentation-only PR adds October 2026 release notes for PeCan’s mutational signature improvements and updates the Genomics Platform’s RTCG sample counts.

Changes:

• Documents heatmap controls, navigation, sortable columns, sample search/export, and sample metadata.
• Updates both RTCG sample counts to 8,235.

File	Description
content/​4.pecan/​6.release-notes/​1.index.md	Adds October 2026 mutational signature release notes.
content/​3.genomics-platform/​2.about-our-data/​1.data-sets-and-data-access-units.md	Aligns RTCG sample counts in the summary table and detail section.

_{Review effort: Balanced}