fix(nu): ignore missing history id in pre-prompt

[cyphercodes]

Fixes #3520.

This changes the Nushell pre-prompt hook to use hide-env -i ATUIN_HISTORY_ID, matching the startup cleanup above it. That keeps overlay/subshell prompts from erroring when ATUIN_HISTORY_ID is already absent.

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

Verification:

• git diff --check
• nu was not available in this runner, so I could not run a local Nushell source smoke test.

[github-actions]

Fossier: Manual Review Requested

@cyphercodes is a new contributor. A maintainer should review this PR before merging.

Score Breakdown

Total Score: 58.3/100 | Confidence: 100% | Outcome: REVIEW

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contribution_history	338	1.00	0.05
follower_ratio	7.0	1.00	0.05
bot_signals	False	0.50	0.04
open_prs_elsewhere	166	0.00	0.09
closed_prs_elsewhere	125	0.00	0.10
merged_prs_elsewhere	139	1.00	0.08
prior_interaction	0	0.00	0.08
activity_velocity	1	1.00	0.08
pr_content	...	0.70	0.08
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org_membership	0	0.20	0.03
commit_verification	...	0.30	0.04
contributor_stars	83	1.00	0.04

[greptile-apps]

Greptile Summary

Adds -i (ignore) flag to hide-env ATUIN_HISTORY_ID in the Nushell pre-prompt hook, matching the identical call already present in the startup block (line 15). This prevents errors in overlay/subshell prompts where ATUIN_HISTORY_ID may be absent.

One subtlety: _atuin_pre_prompt already has an early-return guard (if 'ATUIN_HISTORY_ID' not-in $env { return }) that should prevent hide-env from being reached when the variable is absent. The fix is still correct and defensive — it suggests Nushell overlay/subshell scoping can make $env not-in checks and hide-env see different environments.

Confidence Score: 4/5

Safe to merge — minimal one-line defensive fix with no regression risk.

Change is correct, matches existing startup code, and fixes a real user-reported error. Minor open question about the overlay scoping edge case that makes both the guard and -i necessary, but that doesn't block merging.

No files require special attention.

Important Files Changed

Filename	Overview
crates/atuin/src/shell/atuin.nu	One-line fix: adds -i to hide-env in pre-prompt hook, matching startup behavior. No regression risk.

_{Reviews (1): Last reviewed commit: "fix(nu): ignore missing history id in pr..." | Re-trigger Greptile}

[greptile-apps]

The hide-env -i addition is correct and matches the startup call on line 15. However, _atuin_pre_prompt already has if 'ATUIN_HISTORY_ID' not-in $env { return } at the top — logically, hide-env should only be reached when the variable is present, so the original should not error under normal scoping.

The fact that it does error (#3520) implies Nushell overlay/subshell environments can make not-in $env and hide-env disagree about variable visibility. Adding -i is the right defensive fix, but it would be useful to document this overlay-scoping edge case in a comment so future maintainers understand why both the guard and -i are needed.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!