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/search.go

@@ -127,7 +127,8 @@ func (h *handlers) resolveAlbumRefs(ctx context.Context, q *dbq.Queries, albums
 			h.logger.Error("api: count tracks for album failed", "err", cerr)
 			return nil, cerr
 		}
-		// durationSec=0: not aggregated for search album refs per spec data flow.
+		// durationSec=0: not aggregated for search album refs per spec data
+		// flow.
 		items = append(items, albumRefFrom(a, names[uuidToString(a.ArtistID)], int(count), 0))
 	}
 	return items, nil
@@ -135,7 +136,7 @@ func (h *handlers) resolveAlbumRefs(ctx context.Context, q *dbq.Queries, albums
 
 // resolveTrackRefs builds TrackRefs from dbq.Track rows: looks up the
 // parent album + artist by id for each track (pair of queries per track).
-// At limit=200 this is 400 queries worst case — acceptable for M1.5.
+// At limit=200 this is 400 queries worst case.
 func (h *handlers) resolveTrackRefs(ctx context.Context, q *dbq.Queries, tracks []dbq.Track) ([]TrackRef, error) {
 	items := make([]TrackRef, 0, len(tracks))
 	for _, t := range tracks {