Fix extra closing paren in SX manifesto and TCO essays

Both essays had one excess `)` causing ParseError when navigating
via HTMX (oob_page_sx path).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sx/sxc/sx_components.py

@@ -2649,7 +2649,6 @@ def _essay_sx_manifesto() -> str:
         '      "The authors acknowledge that this manifesto was produced '
         'by the very means of AI production it fails to mention. '
         'This is not a contradiction. It is dialectics.")))'
-        ')'
     )
 
 
@@ -2767,7 +2766,6 @@ def _essay_tail_call_optimization() -> str:
         '      "Having the primitive available doesn\'t add complexity unless it\'s invoked. '
         'See " (a :href "/essays/continuations" :class "text-violet-600 hover:underline" '
         '  "the continuations essay") " for what they would enable in SX.")))'
-        ')'
     )