feat(web,docs): visual summaries (curve, pips/sources incl. 'C', non‑land sources), tooltip copy, favicon; diagnostics (/healthz, request‑id, global handlers); fetches excluded, basics CSV fallback, list highlight polish; README/DOCKER/release-notes/CHANGELOG updated

DOCKER.md

@@ -34,6 +34,16 @@ docker compose up --no-deps web
 Then open http://localhost:8080
 
 Volumes are the same as the CLI service, so deck exports/logs/configs persist in your working folder.
+The app serves a favicon at `/favicon.ico` and exposes a health endpoint at `/healthz`.
+
+### Setup speed: parallel tagging (Web)
+First-time setup or stale data triggers card tagging. The web service uses parallel workers by default.
+
+Configure via environment variables on the `web` service:
+- `WEB_TAG_PARALLEL=1|0` — enable/disable parallel tagging (default: 1)
+- `WEB_TAG_WORKERS=<N>` — number of worker processes (default: 4 in compose)
+
+If parallel initialization fails, the service falls back to sequential tagging and continues.
 
 ### From Docker Hub (PowerShell)
 If you prefer not to build locally, pull `mwisnowski/mtg-python-deckbuilder:latest` and run uvicorn:
@@ -49,6 +59,11 @@ docker run --rm `
     bash -lc "cd /app && uvicorn code.web.app:app --host 0.0.0.0 --port 8080"
 ```
 
+Health check:
+```text
+GET http://localhost:8080/healthz  ->  { "status": "ok", "version": "dev", "uptime_seconds": 123 }
+```
+
 ## Volumes
 - `/app/deck_files` ↔ `./deck_files`
 - `/app/logs` ↔ `./logs`
@@ -77,6 +92,10 @@ docker run --rm `
 - DECK_ADD_LANDS, DECK_FETCH_COUNT
  - DECK_TAG_MODE=AND|OR (combine mode used by the builder)
 
+### Web UI tuning env vars
+- WEB_TAG_PARALLEL=1|0 (parallel tagging on/off)
+- WEB_TAG_WORKERS=<N> (process count; set based on CPU/memory)
+
 ## Manual build/run
 ```powershell
 docker build -t mtg-deckbuilder .