Toby r1 finding: test 13's body-ref filter let the stated mutation escape
('add _pcNewFn to return only → RED' was actually GREEN), and the cut-4
stale-private-reference class (_pcSync bare ref in screen.js) was also
unguarded.
Fix test 13: drop the && screen.js body-ref condition from the leaked
filter — pure 'returned ⊆ destructure' check. Mutation-verified RED:
add _pcNewFn to return but not destructure → leaked = ['_pcNewFn'] → fail 1.
Add test 14: extract every _pc* symbol defined in bg-control.js (function/
let/const declarations), filter to private (not in the destructure), assert
none appears bare in screen.js IIFE body after stripping imports, block
comments, line comments, and the destructure statement. Mutation-verified RED:
inject _pcSync() in screen.js body → stale = ['_pcSync'] → fail 1.
Suite: 235/235 (c4eebe1 base) → 236/236 tip.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014uZ169yfoFYArXz962g7KW
Extracted _pc* subsystem (420 lines) from screen.js IIFE into
src/bg-control.js using a factory DI pattern (createBgControl({...})).
Exports: createBgControl({ BG_STYLE_IDS, _bgReadGlobal, _bgSubscribe,
_bgUnsubscribe, getVenueSceneOverride })
→ { _pcAcquire, _pcRelease }
screen.js: const { _pcAcquire, _pcRelease } = createBgControl({...})
Beyond-subst (2):
1. Factory wrapper (IIFE-scope closure → DI params) — factory export pattern
required because DI values are IIFE-scope, not ES module imports.
2. _venueSceneOverride → getVenueSceneOverride() (live accessor, 1 call site
in _pcSync — mutable let at screen.js:1523 must be read per-call).
DI values all defined before the createBgControl call (screen.js):
- BG_STYLE_IDS: line 1435 | _bgReadGlobal: 1825
- _bgSubscribe/_bgUnsubscribe: 1917-18 | _venueSceneOverride: 1523
First _pcAcquire caller: init() in createFactory() (~line 14850 post-cut).
Construction order correct: createBgControl call before createFactory.
Surprise declared to god before commit (outbox/h3d-cut5-surprise.json):
No bc-panel.js dependency — §8's anticipation was wrong. The
_bcCreateController call at what was ~line 8082 is in _bcSyncMode
(P-section / factory scope), not the H-section. bg-control.js has ZERO
dependency on bc-panel.js.
Tests:
- tests/js/highway_3d_bg_control.test.js (new, 13 class-killers):
stranded-caller (test 13, factory-adapted from bc-panel test 12),
construction-order (tests 11-12), DI completeness (test 2),
live-accessor enforcement (test 3), lifecycle (tests 4-7).
- plugins/highway_3d/tests/background_control.test.js: retargeted from
screen.js slice → bg-control.js factory eval; all 20 existing behaviour
tests preserved (load() uses vm.createContext + augmented return getters).
- tests/js/highway_3d_panel_controls.test.js: createBgControl stub added.
Suite: node --test tests/js/highway_3d*.test.js plugins/highway_3d/tests/*.test.js
base 222/222 (f69c544) → tip 235/235 (+13: 13 new class-killers)
plugin.json: 3.40.0 → 3.41.0
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014uZ169yfoFYArXz962g7KW
