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-chars.sx

@@ -1,3 +1,5 @@
+(defsuite "chars"
+
 ;; Tests for character type (Phase 13)
 ;; Uses (make-char n) and (char-code "x") instead of #\x literals
 ;; (char literal parser syntax tested via sx-parse call)
@@ -183,3 +185,5 @@
 (deftest
   "char-ci>=? equal case-insensitive"
   (assert= true (char-ci>=? (make-char 97) (make-char 65))))
+
+)