tidy the integration harness and its comments

Trim the explanatory comments to short quirk notes, drop the module headers, and fail cleanly: navidrome/gonic now kill their process if they never become ready and the entrypoint always tears down. The prune test waits for the removal to appear in the album list rather than for the scan flag. Correct the AGENTS token-auth note (lms answers 42, Nextcloud 41) and give CI more headroom.

tools/integration-test.nu

@@ -1,8 +1,6 @@
 #!/usr/bin/env nu
 
-# Starts the test servers, prepares the fixture data the Kotlin integration tests expect, runs
-# them, then tears everything down. Enter the integration shell first:
-#
+# Run inside the integration shell:
 #   nix develop .#integration --command nu tools/integration-test.nu
 
 use ./integration/util.nu [port-in-use]
@@ -21,15 +19,16 @@ def main [] {
 
     let work = (^mktemp -d | str trim)
 
-    print "starting navidrome"
-    let nav = (start-navidrome $work)
-    print "starting gonic"
-    let gonic = (start-gonic $work)
-
+    mut nav = -1
+    mut gonic = -1
     mut lms = -1
     mut nc = -1
     mut prune = -1
     let outcome = (try {
+        print "starting navidrome"
+        $nav = (start-navidrome $work)
+        print "starting gonic"
+        $gonic = (start-gonic $work)
         print "starting lms"
         $lms = (start-lms $work)
         print "starting nextcloud"
@@ -50,14 +49,9 @@ def main [] {
         ($env.LAST_EXIT_CODE? | default 1)
     })
 
-    let lms_id = $lms
-    let nc_id = $nc
-    let prune_id = $prune
-    do -i { job kill $nav }
-    do -i { job kill $gonic }
-    if $lms_id >= 0 { do -i { job kill $lms_id } }
-    if $nc_id >= 0 { do -i { job kill $nc_id } }
-    if $prune_id >= 0 { do -i { job kill $prune_id } }
+    for id in [$nav $gonic $lms $nc $prune] {
+        if $id >= 0 { do -i { job kill $id } }
+    }
     rm -rf $work
 
     exit $outcome