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I am looking for verification/documentation on force:hasRecordId. It appears from my experience that recordId is only provided to the "container" component, and it does not feed down to any child components without explicitly passing the value.

Is that right?

BTW, I've read the docs here. They don't address my question.

I think the documentation covers it, but it's not very explicit and relies on us to read into a couple of key words that aren't obviously key words.

A marker interface is a signal to the component’s container to add the interface’s behavior to the component

Emphasis mine. Later,

Important The recordId attribute is set only when you place or invoke the component in an explicit record context. For example, when you place the component directly on a record page layout, or invoke it as an object-specific action from a record page or object home.

Emphasis again mine.

So if we have Components A and B, here:

componentA.cmp

<aura:component implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >

    <c:componentB />

</aura:component>

componentB.cmp

<aura:component implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >

    {! v.recordId }

</aura:component>

You get no output if you place this on a record page. (I did validate this directly).

But if componentA, which is componentB's container, supplies the record Id:

<aura:component implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >

    <c:componentB recordId="{! v.recordId }" />

</aura:component>

You will indeed observe the output.

Only componentA is in an "explicit record context", which the documentation implicitly defines for us as a record page container or use as an object-specific action.

componentB is not in an explicit record context (it could be anywhere) and requires its container, componentA, to provide the recordId.