W14: C9 eliminate empty suite labels (test-only) — section E complete

The finding ("spec suites print with empty suite label") was six files
wide: test-chars (43 suite-less top-level deftests), test-import-bind
(14), test-ports (12), test-let-match (8), test-math (deftests NESTED in
deftests — every test reported as " > sin"), and 4 stray deftests between
suites in test-hyperscript-conformance.

Fixes: file-level defsuite wraps for the four flat files (mechanical wrap,
sx_validate-checked); test-math restructured deftest->defsuite ("math >
string->number"); hs strays wrapped in suites named for their section
comments (hs-compat-blockLiteral/cookies/some/where). The two
baseline-visible identities are renamed in spec/tests/known-failures.txt
in this same commit — the F10 gate enforces exactly this coupling.

Full baseline gate validated GREEN: 5798p/273f, fail set identical
(the -2 passes are the two wrapper deftests that no longer self-report
a vacuous PASS around their children).

Test-only: no semantics edits, no push.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

spec/tests/test-math.sx

@@ -1,7 +1,10 @@
+;; Math completeness tests. C9 note: this file used NESTED deftests with no
+;; defsuite, so every test reported with an empty suite label (" > sin").
+;; Restructured to defsuite/deftest — labels are now "math > sin" etc.
 
-(deftest
-  "math completeness"
-  (deftest
+(defsuite
+  "math"
+  (defsuite
     "trigonometry"
     (deftest
       "sin"
@@ -124,7 +127,10 @@
       true
       (< (abs (- (cos (acos 0.5)) 0.5)) 0.0001)
       "cos(acos(x)) = x")
-    (assert= true (< (abs (- (exp (log 2)) 2)) 0.0001) "exp(log(x)) = x")
+    (assert=
+      true
+      (< (abs (- (exp (log 2)) 2)) 0.0001)
+      "exp(log(x)) = x")
     (assert=
       (* 12 18)
       (* (gcd 12 18) (lcm 12 18))