Altimate Code release notes do not reach 3 of 4 changelog surfaces

[HighnessAtharva]

Three of four Altimate Code changelog surfaces are out of date. Only the main CHANGELOG.md shows the latest release.

Surface	Last release shown
Main CHANGELOG.md	22 Sep 2026
Product changelog page	Aug 2026
Repository tree on main	Apr 2026
Help site changelog page	21 Mar 2026

The release build process has no step to update the release note, so each release updates CHANGELOG.md and nothing else. The product changelog page reads from a separate internal app and does not read CHANGELOG.md.

Every surface should read from CHANGELOG.md:

1. Add a release-note update step to the release build process.
2. Make the internal app behind the product changelog read from CHANGELOG.md.
3. Make the help site changelog page read from CHANGELOG.md.

CHANGELOG.md should be the source of truth because it is the only current surface.

[sahrizvi]

Noted @HighnessAtharva. If possible, please edit to remove unnecessary internal references.