chore: strip remaining pre-fork version references

Second pass — removes chat-switchboard version numbers from config
field docs, section headers, file headers, and test comments. These
were pre-fork version tags that don't apply to switchboard-core.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/js/sw/surfaces/admin/index.js

@@ -34,7 +34,7 @@ const ADMIN_LABELS = {
     audit: 'Audit',
 };
 
-// ── v0.38.3: Extension config sections ──────
+// ── Extension config sections ──────
 // Packages declare config_section in their manifest targeting "admin".
 // We merge them into the appropriate category and section module map.
 const _configSections = window.__CONFIG_SECTIONS__ || [];