1 files changed, 83 insertions, 0 deletions
diff --git a/HANDOFF_2026-02-07_GpuContext.md b/HANDOFF_2026-02-07_GpuContext.md
new file mode 100644
index 0000000..bff2932
--- /dev/null
+++ b/HANDOFF_2026-02-07_GpuContext.md
@@ -0,0 +1,83 @@
+# Handoff: GpuContext Refactor (February 7, 2026)
+
+## Session Summary
+Completed two-phase refactor to improve GPU context management in Effect system.
+
+## Commits Made
+
+### Commit 1: bd939ac
+**Title:** `refactor: Bundle GPU context into GpuContext struct`
+
+**Changes:**
+- Created `GpuContext` struct bundling device/queue/format
+- Updated Effect/PostProcessEffect constructors to take `const GpuContext&`
+- Updated all 19 effect implementations
+- Updated MainSequence.init() and LoadTimeline() signatures
+- Added `gpu_get_context()` accessor
+- Fixed test_mesh.cc compilation error (g_device/g_queue/g_format conflicts)
+
+**Files:** 35 changed, 470 insertions(+), 248 deletions(-)
+
+### Commit 2: 8c9815a
+**Title:** `refactor: Store const GpuContext& in Effect base class`
+
+**Rationale:** User suggested storing `const GpuContext& ctx_` instead of splitting into individual members.
+
+**Changes:**
+- Effect now stores `const GpuContext& ctx_` instead of `device_`, `queue_`, `format_`
+- Simplified constructor: `ctx_(ctx)` vs `device_(ctx.device), queue_(ctx.queue), format_(ctx.format)`
+- Updated all effects to use `ctx_.device`, `ctx_.queue`, `ctx_.format`
+
+**Lifetime Safety:** Reference points to static global `g_gpu_context` from `gpu_get_context()`, which outlives all effects.
+
+**Files:** 16 changed, 58 insertions(+), 60 deletions(-)
+
+## Build Status
+- ✅ All targets build successfully (demo64k, test_demo, all tests)
+- ✅ All 28 tests pass (100% success rate)
+- ✅ Working tree clean
+- ✅ 3 commits ahead of origin/main
+
+## Technical Notes
+
+**GpuContext Lifetime:**
+```cpp
+// Safe reference chain:
+static GpuContext g_gpu_context = {};  // Static global
+gpu_get_context() → &g_gpu_context     // Returns pointer to static
+*gpu_ctx                                // Dereference
+LoadTimeline(..., *gpu_ctx)             // Pass by reference
+Effect::ctx_                            // Store reference to static
+```
+
+**Effect Access Pattern:**
+```cpp
+class Effect {
+ protected:
+  const GpuContext& ctx_;
+  // Effects access: ctx_.device, ctx_.queue, ctx_.format
+};
+```
+
+## Files Modified (Total: 51 files across both commits)
+
+**Core:**
+- src/gpu/gpu.{h,cc}
+- src/gpu/effect.{h,cc}
+- src/gpu/demo_effects.h
+
+**Effects (19 files):**
+- All effects in src/gpu/effects/*.cc
+
+**Generated:**
+- src/generated/timeline.cc
+- src/generated/test_demo_timeline.cc
+
+**Tests (all test files updated to use fixture.ctx())**
+
+## Ready For
+- Push to origin (`git push`)
+- Continue with Task #5 (Spectral Brush Editor) or other priorities
+
+---
+**handoff(Claude):** GpuContext refactor complete. Effect base class now stores const GpuContext& reference. All 28 tests pass.