test(theme-selector): cover the tier-3 acceptance criteria in the self-test

I extended the hash-guarded self-test harness to assert the tier-3 acceptance criteria against the real emitted code, run in headless Chrome: old-JSON import with no packages key, the full package round-trip (fg, bg, bold, italic, inherit, height, source), cleared-state export, unknown-package preservation, and inheritance-cycle termination. All pass. The two DOM-coupled regressions are handled structurally rather than in the harness: updateColor remaps PKGMAP when a palette color is edited, and PKGMAP stores hexes so a deleted palette color leaves package references in the recoverable "(gone)" state.

This closes the tier-3 package-faces milestone: all seven phases plus the test surface have landed.

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