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>

server/pages/loaders.go

@@ -28,7 +28,7 @@ type AdminPageData struct {
 }
 
 // SettingsPageData is what the settings surface templates receive.
-// Feature gates (BYOK, personas) moved to sw.auth.policies in v0.37.19.
+// Feature gates (BYOK, personas) moved to sw.auth.policies.
 type SettingsPageData struct {
 	Section        string               `json:"section"`
 	ConfigSections []ConfigSectionEntry `json:"config_sections,omitempty"`
@@ -116,7 +116,7 @@ func (e *Engine) settingsLoader(c *gin.Context, s store.Stores) (any, error) {
 	}, nil
 }
 
-// ── Config section discovery (v0.38.3) ───────
+// ── Config section discovery ───────
 //
 // Packages declare a config_section in their manifest. This helper scans
 // enabled packages and returns entries whose surfaces array includes the