docs: api comments say what the endpoints do, not how they came to be (#6277)

Rewrites the internal/api comment blocks to rule 32: task, milestone and
rule ids gone, the stories behind them restated as the constraint they
left, stale references corrected (the stream secret is wired from config,
the timezone handler already refreshes the scheduler, the Android app is
the native client, the design docs cited are not in the repo). Also
rewraps comment lines over 80 columns left by the earlier batches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/admin_wanted_test.go

@@ -67,7 +67,7 @@ func listWanted(t *testing.T, h *handlers, user dbq.User, q string) wantsPage {
 	return page
 }
 
-// The list runs like the library (#5572): artists A–Z by the library's sort
+// The list runs like the library: artists A–Z by the library's sort
 // name where the library holds the artist, each artist's albums oldest
 // first; q narrows it to an artist or an album.
 func TestListWants_ArtistsAToZThenTheirAlbumsByDate(t *testing.T) {
@@ -109,7 +109,7 @@ func TestListWants_ArtistsAToZThenTheirAlbumsByDate(t *testing.T) {
 	}
 }
 
-// The Collection's catalogue (#5572): every artist on the list A–Z, each
+// The Collection's catalogue: every artist on the list A–Z, each
 // with how many of their albums are held; an artist's page lists every album
 // of theirs, held or not, under that artist.
 func TestListWantArtists_CatalogueAndAnArtistsPage(t *testing.T) {
@@ -292,7 +292,7 @@ func TestWantTracks_HeldAlbumShowsTheLibrarysTracks(t *testing.T) {
 	}
 }
 
-// The Unmatched section (#5579): the albums matching could not place, a
+// The Unmatched section: the albums matching could not place, a
 // local band's album left off and put back, and a link that names no
 // MusicBrainz album refused before MusicBrainz is asked.
 func TestUnmatched_ListLeaveOffPutBack(t *testing.T) {