13B. Pin that a boot past the barrier wires nothing

[nikolaystrikhar]

What: SchedulerTest pins that a boot() past the barrier runs the sequence inline and wires nothing on plugins_loaded.

Usage:

$before = $this->callbacks_at( 'plugins_loaded' );   // every priority
Absorber::boot();                                    // past the barrier
$this->assertTrue( defined( self::GUARD ) );         // the inline branch ran
$this->assertSame( $before, $this->callbacks_at( 'plugins_loaded' ) );

Why this way:

Deleting the return used to leave the suite green. The inline branch defines the guard constant, so the step it then wired found the sub-plugin already loaded and skipped quietly — the wiring that should never have happened had no symptom left to assert on.

The probe is proved before it is trusted. A counter reading the wrong hook name reports "nothing wired" and passes for the wrong reason, so the test resets, boots inside the window, and asserts the same count rises.

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