The Pirate Phase 1.b: Lidarr + Whisparr + Overseerr tools

Adds 9 read-only tools across three new services:
- Lidarr: queue, artist_search, library_stats (music library awareness)
- Whisparr: queue, series_search, library_stats (adult content, v3 API)
- Overseerr: search, requests, request_counts (cross-library availability,
  request tracking via X-Api-Key header reusing arr_get helper)

Fix _common.py urlencode to use %20 instead of + for query values —
Overseerr rejects + as reserved. Safe for all arr services.

Pirate catalog: 11 → 20 tools.

agents/pirate/tools/_common.py

@@ -27,7 +27,7 @@ def arr_get(service_name, path, params=None):
         raise RuntimeError(f"{service_name} not configured (base_url + api_key required)")
     url = f"{base}{path}"
     if params:
-        url += "?" + urlparse.urlencode(params)
+        url += "?" + urlparse.urlencode(params, quote_via=urlparse.quote)
     req = urlreq.Request(url, headers={"X-Api-Key": key})
     with urlreq.urlopen(req, timeout=15) as resp:
         return json.loads(resp.read().decode())
@@ -41,7 +41,7 @@ def qbit_request(path, method="GET", params=None, data=None, cookies=None):
         raise RuntimeError("qbittorrent not configured")
     url = f"{base}{path}"
     if params:
-        url += "?" + urlparse.urlencode(params)
+        url += "?" + urlparse.urlencode(params, quote_via=urlparse.quote)
     body = None
     headers = {}
     if cookies: