docs: Add Neptune to list of users

[Sword-Smith]

Description

AI Assistance Disclosure

Tools used (required — write none if no AI was used): none

Attestation (required):

• I have read every line of this diff, understand what it does, and can explain it in review.

Notes & open questions

Respect alphabetical sorting of list of users

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-06-09 12:21 UTC · Rule: default
• ✅ Checks skipped · PR is already up-to-date
• ✅ Merged — 2026-06-09 12:22 UTC · at 9076d604852a35d686d5cccb6ee765b1152b452e · squash

This pull request spent 1 minute 38 seconds in the queue, including 20 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • docs: Add Neptune to list of users #6480
• #review-threads-unresolved = 0 [🛡 GitHub branch protection]
  • docs: Add Neptune to list of users #6480
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