chore: Remove useless HANDOFF_*.md files and their references

- Deleted all HANDOFF_*.md files from the repository.
- Removed the corresponding reference from GEMINI.md to avoid broken links.

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diff --git a/HANDOFF_2026-02-07_GpuContext.md b/HANDOFF_2026-02-07_GpuContext.md
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-# 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.