fix(just): call the shell lint recipe that exists

[kixelated]

Summary

just ci currently fails on every PR. #2650 replaced the inline shfmt/shellcheck lines in the ci recipe with just _shell-files, but that recipe does not exist:

error: justfile does not contain recipe `_shell-files`

git log -S"_shell-files:" finds nothing, so it was never defined here or in the history. #2690 and #2707 landed the tracked-scripts change as _shell <action>, which is what _check-common and _fix-common already call. #2650 was carrying the earlier _shell-files naming and it never got reconciled on the way in.

This points ci at _shell check, matching _check-common.

Why it matters

The step runs after cargo deny, the full clippy/doc/nextest pass, and the JS build, so every PR burns a complete CI run before failing on it. Six open PRs are affected (#2693, #2697, #2703, #2704, #2705, #2710).

_shell no-ops when shfmt or shellcheck is missing, where the old inline lines would have failed. Both are in the CI dev shell, so the coverage in CI is unchanged; locally this now matches what just check already did.

Test plan

• nix develop --command just _shell check — resolves and passes
• nix develop --command just --fmt --check --justfile justfile — clean

Public API changes

None; repository tooling only.

(Written by Opus 5)

🤖 Generated with Claude Code

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7512857f-5de1-420b-9d5e-b1dc136c2afc

📥 Commits

Reviewing files that changed from the base of the PR and between f4ce4d5 and 60e16ed.

📒 Files selected for processing (1)

• justfile

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Walkthrough

The ci recipe now calls _shell check for shell validation. It no longer invokes shfmt and shellcheck directly over _shell-files.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states that the existing shell lint recipe is called for just ci.
Description check	✅ Passed	The description explains the nonexistent recipe failure and the change to use _shell check.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/fix-just-shell-files

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