docs: the history phrases the id sweep missed, restated as present-tense facts or traps (#6277)

A wider pass for "previous", "before the fix", "we shipped" and the
like. The chi double-subtree, uppercase Vorbis key and stopPropagation
comments now describe the trap they guard; commit hashes, CI run
numbers and a deleted file name are gone; uuidString's comment says
what it returns.

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

internal/server/server_test.go

@@ -150,13 +150,12 @@ func TestRouter_RestPathNotSwallowedBySPA(t *testing.T) {
 	}
 }
 
-// TestRouter_AdminSubtreeNotShadowed is a regression test for a real bug we
-// shipped in 06a1fe1 and didn't catch until M6a: r.Route("/api/admin", ...)
-// in server.go was creating a second chi subtree at the same prefix as the
-// nested admin Route inside api.Mount. chi.Walk shows both subtrees as
-// registered, but runtime routing dispatch only matches one — every admin
-// endpoint registered by api.Mount (summary, quarantine, etc.)
-// silently 404'd for authenticated callers in production.
+// TestRouter_AdminSubtreeNotShadowed guards the trap of a second
+// r.Route("/api/admin", ...) in server.go: it creates a chi subtree at the
+// same prefix as the nested admin Route inside api.Mount. chi.Walk shows both
+// subtrees as registered, but runtime routing dispatch only matches one, so
+// every admin endpoint registered by api.Mount (summary, quarantine, etc.)
+// would silently 404 for authenticated callers.
 //
 // chi.Walk enumeration would NOT have caught this (both branches are in
 // the tree). The only reliable check is to make a real authenticated
@@ -214,8 +213,7 @@ func TestRouter_AdminSubtreeNotShadowed(t *testing.T) {
 
 	// Each path is registered by a different package: admin/summary from
 	// api.Mount and admin/scan from server.Router. If chi runtime dispatch
-	// only routes one /api/admin subtree, one of these returns 404 — that
-	// IS the bug we shipped in 06a1fe1.
+	// only routes one /api/admin subtree, one of these returns 404.
 	cases := []struct {
 		method string
 		path   string