docs: Condense essential context files (856→599 lines)

Extract detailed examples and untriaged tasks to on-demand docs.
Created BACKLOG.md, ARCHITECTURE.md, CODING_STYLE.md, TOOLS_REFERENCE.md.
Reduces always-loaded token budget by 30% while preserving all information.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/doc/TOOLS_REFERENCE.md b/doc/TOOLS_REFERENCE.md
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+# Developer Tools Reference
+
+Comprehensive reference for all developer tools in the project.
+
+---
+
+## Windows Cross-Compilation
+
+```bash
+# Fetch dependencies
+./scripts/fetch_win_deps.sh
+
+# Build Windows binary
+./scripts/build_win.sh
+
+# Run with Wine
+./scripts/run_win.sh
+```
+
+---
+
+## spectool (Audio Analysis)
+
+```bash
+# Build
+cmake -S . -B build -DDEMO_BUILD_TOOLS=ON
+cmake --build build -j4
+
+# Analyze WAV → .spec
+./build/spectool analyze input.wav output.spec
+
+# Play .spec file
+./build/spectool play input.spec
+```
+
+---
+
+## specview (Visualization)
+
+```bash
+# View spectrogram
+./build/specview input.spec
+```
+
+Displays spectrogram visualization.
+
+---
+
+## specplay (Diagnostic)
+
+```bash
+# Analyze .spec file
+./build/specplay input.spec
+
+# Or analyze .wav file
+./build/specplay input.wav
+```
+
+Output: Peak, RMS, clipping detection.
+
+---
+
+## Code Coverage (macOS)
+
+```bash
+# Install lcov
+brew install lcov
+
+# Generate coverage report
+./scripts/gen_coverage_report.sh [target_dir]
+```
+
+Creates HTML coverage report.
+
+---
+
+## Submodule Updates
+
+```bash
+cd third_party/wgpu-native
+git fetch
+git checkout trunk
+git reset --hard origin/trunk
+cd ../..
+git add third_party/wgpu-native
+git commit -m "chore: Update wgpu-native"
+```
+
+Updates wgpu-native to latest trunk.