[devin-ai-integration]

Summary

Closes #18. DocumentQueries::Descendants walks the owned members of each namespace, so a document query never sees the relationships that own a model's elements — memberships, specializations, typings, feature values, imports — nor the elements those own in turn (a connector's implied ends, a port definition's conjugated ~P, a satisfy usage's subject parameter). KerML 8.3.2.1 defines ownership through exactly those relationships (ownedRelationship, then ownedRelatedElement), and a reflection view needs them.

One optional parameter on the existing calc def, default false, so every existing query reads as before:

calc def Descendants {
    in source : Element[0..*] ordered;
    in maxDepth : Integer[0..1] default null;
    in relationships : Boolean[0..1] default false;   // new
    return result : Element[0..*] ordered;
}

relationships = true walks ownedRelationship, then the related elements each relationship owns, recursively to maxDepth; the doc comment states the semantics. .meta.json is regenerated (write-project-meta.py: the unit's checksum).

• Semver impact: MINOR — a new optional parameter; no name or existing meaning changes.
• Engine contract: unchanged — engine-contract.json lists DocumentQueries::Descendants by name only.
• Matching OpenSysML change: the engine side (internal/doc/queryexec/operations.go, with a test walking a part definition's memberships, typings and connector ends) is ready on feat/descendants-relationships; its PR re-pins the vendored copy to this merge.
• Validation: ./scripts/validate-libraries.sh on the pinned pilot, ./scripts/check-readme-table.sh, ./scripts/write-project-meta.py --check.

Link to Devin session: https://nasa-jpl-demo.devinenterprise.com/sessions/18ad47adf36f44e9b6824a4472f9678d
Open in Devin Desktop: https://nasa-jpl-demo.devinenterprise.com/desktop/session/18ad47adf36f44e9b6824a4472f9678d?variant=devin
Requested by: @NicolasRouquette

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[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.