mesh11sd: add new package - #30168

Checking PR #30168: mesh11sd: add new package (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (add-mesh11sd)

Commit d761389 - mesh11sd: add new package:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "mesh11sd: add new package"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
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