Add up direction to syntax

[EarlPitts]

Implements #2591

Adds the up direction to the syntax as a noop.
Will be useful later for things that can be traversed both up and down.

[byorgey]

Looks good to me! Thanks!

[mergify]

Merge Queue Status

Rule: default

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• ✅ Entered queue — 2026-02-20 20:57 UTC
• ✅ Checks passed · in-place
• ✅ Merged — 2026-02-20 20:57 UTC · at ba9aa57add4d89bda7837b140f1d703732277f35

This pull request spent 5 seconds in the queue, with no time running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • Add up direction to syntax #2689
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • Add up direction to syntax #2689

[byorgey]

@EarlPitts , congrats on having your first PR accepted to Swarm! We appreciate the contribution and we're really glad to welcome you as part of the community. In a minute we will send you an invite to the repo (see https://github.com/swarm-game/swarm/blob/main/CONTRIBUTING.md#i-have-push-access-to-the-swarm-repository-now-what ). If you use Discord, feel free to also join the Swarm server at https://discord.gg/kp8MuSgkPw .

@all-contributors, please add @EarlPitts for code!