PPC hit scrambles the secondary displays (phase-14, all three work items)

Restores the PPC's authentic secondary-display effect: an EnergyDamageType hit
scrambles every secondary cockpit display for 0.8s while the main out-the-window
view stays clean.  Was fully specced (phase-14) with the engine half already
present under the original VWE names; only the trigger and the visual were
missing (the visual STUBBED since 2007).

A -- TRIGGER (game/reconstructed/mech.cpp): in TakeDamageMessageHandler, at the
  binary's @0x4a03f3 position (after the cylinder resolve, before the burst
  loop, so ONCE per damage message) fire
  GetGaugeRenderer()->SpecialEffect(scrambleVideo, damageType*0.2f) on
  EnergyDamageType (==4).  That type is authored on exactly the 14 PPC/ERPPC
  records, so the branch is structurally PPC-exclusive -- no weapon-class check.
  Duration DERIVED from the ordinal (4*0.2==0.8s), not a literal.  BT_DMG_LOG
  prints [ppc-scramble].

B -- VISUAL (SVGA16::FunkyVideo, was the 2007 stub): FunkyVideo now arms
  scrambleActive; new SVGA16::ScrambleRowShift is a per-source-row horizontal
  shear+roll, read by BOTH DrawDevSurface (surround/dock) and ExpandPlaneToBGRA
  (glass windows, native + rotated radar), so all secondary surfaces shear
  together in source space and the main 3D view (separate timing chain) is
  untouched -- the modern stand-in for the VGA CRTC Horizontal-Total detune.
  Tunable: BT_SCRAMBLE_SHEAR (px/line, def 4), BT_SCRAMBLE_ROLL (px/sec, def
  220); BT_SCRAMBLE_TEST=1 forces it on for tuning by eye.

C -- NON-STACKING LATCH (L4GaugeRenderer::SpecialEffect): ignore the re-arm while
  scrambleVideoFlag is set (matches the binary's `modified` latch) -- a second
  PPC during the window no longer extends it.  Was a divergence.

Verified: Release links clean; surround boots + runs with the effect forced on,
every secondary MFD + the radar shear while the out-the-window view stays clean,
no crash (screenshot).  Open (for the playtesters who filed the report): live
PPC-fire confirmation + by-eye shear tuning -- k/roll are not recoverable from
the binary.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

phases/phase-14-ppc-sync-distortion.md

@@ -3,11 +3,34 @@
 **Goal:** restore the PPC's authentic secondary effect — a PPC strike scrambles
 **every secondary cockpit display for 0.8 s**, leaving the main view untouched.
 
-**Status:** NOT STARTED. Spec only. Discovered 2026-08-06 by disassembly of the
-shipped `BTL4OPT.EXE` (md5 `a97075bcb5634d13263e9ad5a2b96fd0`) after playtesters
-reported *"being hit by a PPC makes it look like all of the secondary CRTs were
-being degaussed."* Full findings: `context/gauges-hud.md` §"PPC HIT = a
-deliberate CRTC horizontal-sync DETUNE"; cross-ref in `context/combat-damage.md`.
+**Status:** ✅ IMPLEMENTED 2026-08-06 (branch `ppc-sync-distortion`) [T2 —
+visual screenshot-verified, trigger by construction]. Discovered 2026-08-06 by
+disassembly of the shipped `BTL4OPT.EXE` (md5 `a97075bcb5634d13263e9ad5a2b96fd0`)
+after playtesters reported *"being hit by a PPC makes it look like all of the
+secondary CRTs were being degaussed."* Full findings: `context/gauges-hud.md`
+§"PPC HIT = a deliberate CRTC horizontal-sync DETUNE"; cross-ref in
+`context/combat-damage.md`.
+
+**What shipped (all three work items):**
+- **A — trigger:** `game/reconstructed/mech.cpp`, `Mech::TakeDamageMessageHandler`
+  @0x4a03f3 position (after the cylinder resolve, before the burst loop) — fires
+  `GetGaugeRenderer()->SpecialEffect(scrambleVideo, damageType*0.2f)` once per
+  EnergyDamageType message. `BT_DMG_LOG` prints `[ppc-scramble]`.
+- **B — visual:** `SVGA16::FunkyVideo` (was the 2007 stub) now arms `scrambleActive`;
+  `SVGA16::ScrambleRowShift` (new) is the per-source-row horizontal shear, read by
+  BOTH `DrawDevSurface` (surround/dock) and `ExpandPlaneToBGRA` (glass windows), so
+  all secondary surfaces + the rotated radar shear together and the main 3D view
+  (a separate timing chain) is untouched. Tunable: `BT_SCRAMBLE_SHEAR` (px/line,
+  default 4), `BT_SCRAMBLE_ROLL` (px/sec, default 220). **`BT_SCRAMBLE_TEST=1`
+  forces it always-on for tuning by eye without waiting for a PPC hit.**
+- **C — non-stacking latch:** `L4GaugeRenderer::SpecialEffect` now ignores the
+  re-arm while `scrambleVideoFlag` is set (matches the binary's `modified` latch);
+  a second PPC during the window no longer extends it.
+- Verified: Release links clean; surround boots + runs with the effect forced on,
+  every secondary MFD + the radar shear while the out-the-window view stays clean,
+  no crash. **Open:** live PPC-fire confirmation (one arm per hit, non-stacking
+  across two hits) + the by-eye shear tuning belong to the playtesters who filed
+  the report — `k`/`roll` are not recoverable from the binary.
 
 **Good news up front:** the engine half already exists in our tree under the
 **original VWE names** (`SpecialEffect` / `scrambleVideo` / `FunkyVideo`). Only