One namespace prefix list, and the settings-boundary assertion covers all three verbs

[sameera]

Close the two instrumentation gaps epic #253 left: the namespace prefix list has one definition rather than a predicate plus a hand-copied pair of ignore globs, and the settings-file before/after assertion covers uninstall and migrate-components as well as install.

Meta

• feature: docs/features/component-distribution
• estimate: S
• source: deferred from epic Build the install, removal and migration verbs on one component-mirror primitive (Build the install, removal and migration verbs on one component-mirror primitive #253) (2026-08-27)