feat(stats): add v1 immersion stats dashboard (#19)

docs/architecture/domains.md

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+<!-- read_when: locating ownership for a runtime, feature, or integration -->
+
+# Domain Ownership
+
+Status: active
+Last verified: 2026-03-13
+Owner: Kyle Yasuda
+Read when: you need to find the owner module for a behavior or test surface
+
+## Runtime Domains
+
+- Desktop app runtime: `src/main.ts`, `src/main/`, `src/core/services/`
+- Overlay renderer: `src/renderer/`
+- Launcher CLI: `launcher/`
+- mpv plugin: `plugin/subminer/`
+
+## Product / Integration Domains
+
+- Config system: `src/config/`
+- Overlay/window state: `src/core/services/overlay-*`, `src/main/overlay-*.ts`
+- MPV runtime and protocol: `src/core/services/mpv*.ts`
+- Subtitle/token pipeline: `src/core/services/tokenizer*`, `src/subtitle/`, `src/tokenizers/`
+- Anki workflow: `src/anki-integration/`, `src/core/services/anki-jimaku*.ts`
+- Immersion tracking: `src/core/services/immersion-tracker/`
+- AniList tracking: `src/core/services/anilist/`, `src/main/runtime/composers/anilist-*`
+- Jellyfin integration: `src/core/services/jellyfin*.ts`, `src/main/runtime/composers/jellyfin-*`
+- Window trackers: `src/window-trackers/`
+- Stats app: `stats/`
+- Public docs site: `docs-site/`
+
+## Ownership Heuristics
+
+- Runtime wiring or dependency setup: start in `src/main/`
+- Business logic or service behavior: start in `src/core/services/`
+- UI interaction or overlay DOM behavior: start in `src/renderer/`
+- Command parsing or mpv launch flow: start in `launcher/`
+- User-facing docs: `docs-site/`
+- Internal process/docs: `docs/`