test(typos): cover all four inline ignore directive forms

fixtures/typos/good/Clean.txt

@@ -3,4 +3,21 @@ This sentence is spelled correctly and should pass the spell checker.
 
 A separate concern is handled here, and the receipt is acknowledged.
 
+Each block below plants a real misspelling that typos would normally flag, then
+silences it with one of the four blessed ignore directives. The whole fixture
+must still exit 0; if any directive stopped working, the planted misspelling
+would surface and fail this fixture.
+
 teh  # spellchecker:disable-line
+
+# spellchecker:ignore-next-line
+recieve
+
+# spellchecker:off
+seperate
+occured
+# spellchecker:on
+
+<!-- spellchecker:off -->
+definately
+<!-- spellchecker:on -->

modules/typos/typos.test.sh

@@ -1,7 +1,9 @@
 #!/usr/bin/env bash
-# Tests the typos module: the spell-checker passes the good fixture (including
-# an inline `spellchecker:disable-line` directive) and flags the bad fixture.
-# Skips cleanly when the engine is absent.
+# Tests the typos module: the spell-checker passes the good fixture and flags
+# the bad fixture. The good fixture plants a real misspelling under each of the
+# four blessed ignore directives (disable-line, ignore-next-line, the comment
+# block, and the HTML-comment block), so a good->exit-0 result conjunctively
+# proves every directive form still suppresses. Skips when the engine is absent.
 set -uo pipefail
 # shellcheck source=harness/shell/lib.sh
 source "$(git rev-parse --show-toplevel)/harness/shell/lib.sh"