sendspin-cli: add new package - #30577

Checking PR #30577: sendspin-cli: add new package (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (sendspin-cli)

Commit e469eb5 - sendspin-cli: add new package:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "sendspin-cli: add new package"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.