feat: make version constants and schema hash opt-in via -versionFuncs

The schema hash in the file header comment and the WebRPCSchemaHash constant
change on every schema edit, producing perpetual git merge conflicts in
generated files. The version constants (WebRPCVersion, WebRPCSchemaVersion,
WebRPCSchemaHash) are rarely consumed.

Gate the whole block behind a new -versionFuncs target option (default false),
flipping the previous always-on behavior:

- default: header comment carries only the name and version (no hash), and no
  version constants are emitted. The "Code generated by ... DO NOT EDIT." line stays.
- with -versionFuncs: restores today's output exactly (hash in the header plus
  all three constants).

The flag name is shared across all webrpc generators for consistency (gen-golang
emits helper functions; this target emits constants).

Regenerated _examples to reflect the new default.

Author: klaidliadon

_examples/hello-webrpc/webapp/client.gen.js

@@ -1,18 +1,9 @@
-// hello-webrpc v1.0.0 949b00a8db9810c69295f9dd9f02587a65d3c497
+// hello-webrpc v1.0.0
 // --
 // Code generated by webrpc-gen@v0.37.0 with ../../ generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=hello-api.ridl -target=../../ -exports=false -client -out=./webapp/client.gen.js
 
-// WebRPC description and code-gen version
-const WebRPCVersion = "v1"
-
-// Schema version of your RIDL schema
-const WebRPCSchemaVersion = "v1.0.0"
-
-// Schema hash generated from your RIDL schema
-const WebRPCSchemaHash = "949b00a8db9810c69295f9dd9f02587a65d3c497"
-
 //
 // Types
 //

main.go.tmpl

@@ -5,6 +5,7 @@
 {{- set $opts "client" (ternary (in .Opts.client "" "true") true false) -}}
 {{- set $opts "server" (ternary (in .Opts.server "" "true") true false) -}}
 {{- set $opts "exports" (ternary (in .Opts.exports "false") false true) -}}
+{{- set $opts "versionFuncs" (ternary (in .Opts.versionFuncs "" "true") true false) -}}
 
 {{- /* Print help on -help. */ -}}
 {{- if exists .Opts "help" -}}
@@ -52,12 +53,13 @@
 {{- set $typeMap "string" "string" -}}
 {{- set $typeMap "timestamp" "string" -}}
 
-// {{.SchemaName}} {{.SchemaVersion}} {{.SchemaHash}}
+// {{.SchemaName}} {{.SchemaVersion}}{{if $opts.versionFuncs}} {{.SchemaHash}}{{end}}
 // --
 // Code generated by webrpc-gen@{{.WebrpcGenVersion}} with {{.WebrpcTarget}} generator. DO NOT EDIT.
 //
 // {{.WebrpcGenCommand}}
 
+{{- if $opts.versionFuncs }}
 // WebRPC description and code-gen version
 {{if $opts.exports}}export {{end}}const WebRPCVersion = "{{.WebrpcVersion}}"
 
@@ -66,6 +68,7 @@
 
 // Schema hash generated from your RIDL schema
 {{if $opts.exports}}export {{end}}const WebRPCSchemaHash = "{{.SchemaHash}}"
+{{- end }}
 
 {{template "types" dict "Services" .Services "Types" .Types "Opts" $opts}}
 {{- if $opts.client}}