backend-infra-engineer: Post v0.3.9-hotfix7 snapshot (build cleanup)

docs/internal/research/implot-visualization-ideas.md

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+# ImPlot Integration and Visualization Ideas
+
+This repository now ships a thin wrapper for ImPlot under `yaze::gui::plotting`
+(`src/app/gui/plots/implot_support.*`). The helpers:
+- Ensure the ImPlot context exists (`EnsureImPlotContext()`).
+- Apply theme-aware styling (`PlotStyleScope`, `BuildStyleFromTheme`).
+- Wrap `BeginPlot`/`EndPlot` with RAII (`PlotGuard`).
+
+Example usage:
+```c++
+using namespace yaze::gui::plotting;
+
+PlotStyleScope plot_style(ThemeManager::Get().GetCurrentTheme());
+PlotConfig config{.id = "Tile Usage", .flags = ImPlotFlags_NoLegend};
+PlotGuard plot(config);
+if (plot) {
+  ImPlot::PlotHistogram("tiles", tile_hist.data(), tile_hist.size());
+}
+```
+
+Candidate ROM-hacking visualizations worth adding:
+- Tile and palette analytics: histograms of tile IDs per region; stacked bars of palette usage; scatter of tile index vs. frequency to find unused art.
+- VRAM/CHR timelines: line plots of VRAM writes or DMA burst sizes during playback; overlays comparing two builds to spot regressions.
+- Memory watch dashboards: line plots of key WRAM variables (health, rupees, mode flags) with markers for room transitions or boss flags.
+- RNG/logic inspection: scatter of RNG seed vs. outcome (drops, patterns); step plots of RNG state across frames to debug determinism.
+- Audio/SPC insight: per-channel volume over time; simple spectrum snapshots before/after a music tweak.
+- Compression/asset diffs: bar charts of bank sizes and free space; plot of LZ chunk sizes to catch anomalies.
+- Overworld/dungeon tuning: line plots of enemy counts, chest density, or item rarity per region; cumulative difficulty curves across progression.
+- Performance profiling: stacked bars for frame time breakdowns (render vs. emu vs. scripting); list of slowest frames with hover tooltips describing scene state.
+- Script/event timelines: Gantt-like plots for cutscene steps or event triggers, with hover showing script IDs and offsets.