fix(cli): normalize hosted agent lookups

[Cvv9]

What changed

• normalize managed-agent projection coordinates from raw 64-hex or the documented hosted-agent:<64-hex> compatibility form
• ignore malformed projection coordinates instead of surfacing pseudo-pubkeys
• allow users get --owner --pubkey to verify an exact existing profile without depending on a legacy projection
• do not mint or publish any new owner authorization tags

Verification

• cargo test -p buzz-cli --lib (353 passed)
• cargo clippy -p buzz-cli --all-targets -- -D warnings
• cargo fmt --all -- --check
• git diff --check