refactor: replace doc_auto_cfg with doc_cfg

[arctic-alpaca]

doc_auto_cfg has been merged into doc_cfg in rust-lang/rust#138907.

Also bumps the Rust nightly version to actually capture the doc_cfg change.

Fixes: DEV-1000

[claude]

Change Summary

This PR updates the Rust feature flag from doc_auto_cfg to doc_cfg in veecle-os/src/lib.rs:5. The change replaces the deprecated doc_auto_cfg feature with doc_cfg following the merge of rust-lang/rust#138907.

✅ Review complete - no issues found

The change is correct and necessary:

• Properly updates to the current Rust documentation feature
• Maintains the same functionality for conditional documentation generation
• Follows the upstream consolidation in the Rust compiler

[github-actions]

Deployment - Branch link	Commit link - e0f9cf5
user-manual preview	https://f2589b7f.user-manual-2bd.pages.dev
private-docs preview	https://3fad269f.private-docs-3bh.pages.dev
veecle-telemetry-ui preview	https://5f0f986c.veecle-telemetry-ui.pages.dev
veecle-telemetry-ui-vscode preview	https://6905950f.veecle-telemetry-vscode-extension.pages.dev/veecle-telemetry-ui.vsix

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.64%. Comparing base (3a7bfaa) to head (ed4902e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
veecle-telemetry-server/src/main.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
veecle-os-data-support-someip/src/string.rs	100.00% <100.00%> (ø)
veecle-os-runtime/src/datastore/reader.rs	88.09% <ø> (ø)
veecle-telemetry-server/src/main.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[alexveecle]

I did not follow completely the linked issues, but seems... right?

[arctic-alpaca]

You can also check the error message where it explicitly mentions the merge: https://github.com/veecle/freertos-integration/actions/runs/18135434346/job/51612819143?pr=30

(Different repo as we don't test this in veecle-os in CI)

[alexveecle]

Ah, thanks! I still don't have full understanding of the issue, but that makes me feel better about adding my +1 :D

[Nemo157]

We should update the pinned nightly so that the CI generated docs keep the annotations.

Yeah, maybe nightly needs to be updated :\

[arctic-alpaca]

#54 to bump nightly.

[Nemo157]

I'd like it combined, since this is a behavioral change with the currently pinned version (doc_cfg on this version just allows you to write #[doc(cfg(...))] manually).

[Nemo157]

(we should probably open another issue about flaky someip tests and try to fix them again, they seem to be even flakier on the github-hosted runners)