Drop subject:LiveTrack from the Apps Script's Gmail search, it finds nothing

Documented as matching regardless of language, on the assumption
Gmail's subject: operator does a substring match — empirically false
against a real, currently-arriving LiveTrack email whose subject does
contain the word ("Sledujte LiveTrack používateľa ...", confirmed
2026-09-20): with the filter, the search returned zero threads;
removing it and rerunning found the email immediately. Left out
entirely rather than replaced — from:noreply@garmin.com plus the
session-link regex already narrows this down to real LiveTrack emails
with something usable in them.

docs/deployment.adoc

@@ -212,7 +212,7 @@ const PROCESSED_LABEL = "livetrack-processed";
 
 function checkLiveTrackEmail() {
   const label = GmailApp.getUserLabelByName(PROCESSED_LABEL) || GmailApp.createLabel(PROCESSED_LABEL);
-  const threads = GmailApp.search(`from:noreply@garmin.com subject:LiveTrack -label:${PROCESSED_LABEL}`);
+  const threads = GmailApp.search(`from:noreply@garmin.com -label:${PROCESSED_LABEL}`);
 
   threads.forEach(thread => {
     // getBody() (raw HTML), not getPlainBody(): the email has no text/plain
@@ -235,9 +235,14 @@ function checkLiveTrackEmail() {
 
 The Gmail label (rather than marking the message read/unread) tracks which
 threads are already handled without touching the user's own inbox state.
-`subject:LiveTrack` matches regardless of the account's language — Garmin
+No `subject:LiveTrack` filter on the search — despite Gmail's own
-keeps "LiveTrack" as-is in the subject even in a localized
+substring-match documentation for `subject:`, that filter empirically
-("Sledujte LiveTrack používateľa ...") one.
+returned zero threads against a real, currently-arriving LiveTrack email
+whose subject does contain the word ("Sledujte LiveTrack používateľa
+...", confirmed 2026-09-20), so it's left out entirely — the regex match
+below is what actually narrows this down to real LiveTrack emails with a
+usable session link, `from:noreply@garmin.com` alone is deliberately
+broad.
 
 Set the trigger from the editor: clock icon on the left (Triggers) → *Add
 Trigger* → function `checkLiveTrackEmail`, time-driven, "Minutes timer",