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/models/models.go

@@ -218,7 +218,7 @@ func IntPtr(i int) *int             { return &i }
 func BoolPtr(b bool) *bool          { return &b }
 
 // =========================================
-// GROUPS (v0.16.0)
+// GROUPS
 // =========================================
 
 // Group scope constants (reuses ScopeGlobal, ScopeTeam from above)
@@ -286,7 +286,7 @@ type ResourceGrant struct {
 // KBChunk is a text segment from a document with its embedding vector.
 // KBSearchResult is a single result from similarity search.
 // ChannelKB represents a knowledge base linked to a channel.
-// PROVIDER HEALTH (v0.22.0)
+// PROVIDER HEALTH
 
 // ProviderStatus represents the derived health state.
 
@@ -294,10 +294,10 @@ type ResourceGrant struct {
 
 // ErrorRate returns the error fraction, or 0 if no requests.
 
-// CAPABILITY OVERRIDES (v0.22.0)
+// CAPABILITY OVERRIDES
 
 // CapabilityOverride is an admin correction for a model's capabilities.
-// ROUTING POLICIES (v0.22.2)
+// ROUTING POLICIES
 
 // RoutingPolicy is one routing rule that controls how requests are
 // dispatched to provider configs. Stored in the routing_policies table.