comments: drop retired lint markers, re-cite migrated carriers

peel-ok/sizelint-ok/primsize-ok annotations lose their tools; sites
keep the WHY in plain words. Citations of retired carriers move to
their fixture or @test successors (949_errtype_compare -> r949_*,
900_stdlib -> library owners).

examples/lisp/lisp_test.ww

@@ -201,10 +201,8 @@ fn check_str(name: str, input: str, want: str, ep: **env) void = {
 	};
 };
 
-// strconv.f64tos probes. We run them through lisp_test rather than a
-// standalone strconv test program because there's no stdlib-test
-// scaffolding yet (cf. test/wcc/900_stdlib.c which only checks
-// modules compile, not behaviour). Move out when that lands.
+// strconv.f64tos probes. Library-owned strconv tests cover formatting;
+// these rows retain the application-level consumer expectations here.
 fn check_f64tos(name: str, v: f64, want: str) void = {
 	ntotal += 1;
 	let s: str = strconv.f64tos(v);