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hyperframes/packages
Vance Ingalls f44bc3a525 fix(engine,producer): drive forceScreenshot from one authoritative local
Miguel R4 blocker on #2359: my R3 fix at renderOrchestrator only updated
the observability copy, leaving the authoritative captureForceScreenshot
local at compileResult.forceScreenshot (false for auto→software). The
frameCapture side clamped its own local and correctly routed screenshot,
but downstream orchestrator code overwrote observability back to
beginframe from the still-false local at two sites:

  - Parallel-stream label at renderOrchestrator.ts:2293 mis-labelled the
    stream as 'beginframe' when actual capture was 'screenshot'.
  - capture_strategy telemetry at renderOrchestrator.ts:2440-2450
    overwrote the earlier observability correction, so the final
    captureMode observation flipped back to 'beginframe' while the
    engine actually captured screenshot.

Fix: extract the clamp into a caller-facing helper
applyConcreteGpuScreenshotClamp(current, resolvedGpuMode, cfg) that
returns the (possibly-promoted) new boolean. Callers assign it back to
their authoritative local, so routing + telemetry + strategy code read
one value.

Changes:

  - packages/engine/src/config.ts: new exported
    applyConcreteGpuScreenshotClamp; delegates to
    shouldClampToScreenshotForConcreteGpu but computes the caller's
    final value, not just the clamp decision. Reads the programmatic
    opt-out from cfg.forceScreenshotExplicitlyOptedOut. Idempotent on
    already-true input.
  - packages/engine/src/index.ts: export the new helper.
  - packages/engine/src/services/frameCapture.ts: replace the inline
    OR expression with applyConcreteGpuScreenshotClamp.
  - packages/producer/src/services/renderOrchestrator.ts: assign result
    into the AUTHORITATIVE captureForceScreenshot local (was updating
    only observability). Downstream parallel-stream label at :2293 and
    capture_strategy telemetry at :2440-2450 now read the corrected
    value.

Tests: 6 new caller-level cases for applyConcreteGpuScreenshotClamp
covering the exact matrix Miguel called out:

  - resolved software + default false → promotes to true (screenshot)
  - resolved software + programmatic opt-out → stays false (BeginFrame)
  - resolved hardware + default false → stays false
  - resolved software + already-true → stays true (idempotent)
  - resolved software + env PRODUCER_FORCE_SCREENSHOT=false → stays false
  - resolved software + undefined cfg → promotes to true (frameCapture path)

Local: 67/67 engine config tests pass (was 61). oxfmt clean.
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