4B. Pin what a container set after boot really does

[nikolaystrikhar]

What: tests for Absorber::boot(), the collaborator accessors and the plugins_loaded steps when Config::set_container() is called after boot.

Usage: none — the behaviour is unchanged. What changes is that the warning on boot() is now a behaviour the suite holds: the hooks keep the container boot closed over, the accessors answer for the replacement, and a second boot() binds nothing into it.

Why this way:

A warning only a docblock makes is a warning nothing enforces. Two live containers is the failure mode a host hits by wiring set_container() from a service provider, and until now the suite would have stayed green through any change to which half resolves from where.

Asserted by loading a sub-plugin and reading Absorber::all(), not by counting resolutions. The damage is not that two containers exist — it is that the load pass works while the registry a host can reach reports nothing, with no report in between, which is exactly what a host would go debugging.

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[nikolaystrikhar]

Folded into #70: 53-registrar-agrees-with-all now carries this commit, so the diff here is empty and there is no stack left to order. Closing.