Update HERMES_VERSION to v2026.9.7

[gitricko]

This pull request updates the version of Hermes used in the Docker image to ensure the application uses the latest features and bug fixes.

• Dependency update:
  • Updated the HERMES_VERSION build argument in the docker/Dockerfile from v2026.8.31 to v2026.9.7 to use the latest Hermes release.

[Copilot]

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[greptile-apps]

Greptile Summary

Updates the Hermes version used by the Docker image from v2026.8.31 to v2026.9.7.

• Changes the default HERMES_VERSION build argument.
• The new pin cannot currently be downloaded from the upstream repository, preventing the image build.

Confidence Score: 4/5

This PR is not safe to merge because its Hermes pin prevents the Docker image from building.

The changed version is used directly in a fail-fast installer URL, but the selected upstream ref is unavailable.

Files Needing Attention: docker/Dockerfile

Important Files Changed

Filename	Overview
docker/Dockerfile	Updates the Hermes pin to an unavailable upstream ref, causing the installer download and Docker build to fail.

Prompt To Fix All With AI

### Issue 1
docker/Dockerfile:1
**Unavailable Hermes ref breaks builds**

When the image uses the default `HERMES_VERSION`, the new `v2026.9.7` ref makes the fail-fast installer request return 404, causing the Docker build to fail.

```suggestion
ARG HERMES_VERSION="v2026.8.31"
```

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "Update HERMES_VERSION to v2026.9.7" | Re-trigger Greptile}

[greptile-apps]

Unavailable Hermes ref breaks builds

When the image uses the default HERMES_VERSION, the new v2026.9.7 ref makes the fail-fast installer request return 404, causing the Docker build to fail.

Suggested change

	ARG HERMES_VERSION="v2026.9.7"
	ARG HERMES_VERSION="v2026.8.31"

Prompt To Fix With AI

This is a comment left during a code review.
Path: docker/Dockerfile
Line: 1

Comment:
**Unavailable Hermes ref breaks builds**

When the image uses the default `HERMES_VERSION`, the new `v2026.9.7` ref makes the fail-fast installer request return 404, causing the Docker build to fail.

```suggestion
ARG HERMES_VERSION="v2026.8.31"
```

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.