Add 2026-04-07 auth session public report

[ChiragAgg5k]

Summary

• add the public incident report for the 2026-04-07 auth session failure incident
• place it in the repositorys standard dated path at 2026/04/07/readme.md

Why

• publish the external-facing write-up in appwrite/incidents

Validation

• reviewed the rendered markdown content locally
• docs-only change; no code tests apply

[greptile-apps]

Greptile Summary

This PR adds the public post-incident report for the 2026-04-07 auth session failure at 2026/04/07/readme.md, following the repository's standard dated-path convention. The report is well-structured and internally consistent, covering timeline, root cause (URL-encoded cookie values not decoded server-side), resolution, lessons learned, and action items with appropriate links to the Better Stack incident and fix PR.

Confidence Score: 5/5

Documentation-only change with no code impact; safe to merge.

This is a single markdown file addition. The content follows the repository's established format, the timeline and root cause are internally consistent, and appropriate external links are included. No functional code is changed.

No files require special attention.

Important Files Changed

Filename	Overview
2026/04/07/readme.md	New public incident report for the 2026-04-07 auth session failure; follows repo conventions, timeline and root cause are internally consistent, links provided for status page and fix PR.

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