refactor: replace per-style param functions with monolithic dispatchers

Replace 14 per-style bind/style files with 2 monolithic dispatchers
(BindParameter, BindQueryParameter, BindRawQueryParameter, StyleParameter)
that take the style as a field in ParameterOptions and dispatch internally.

Add Style and AllowReserved fields to ParameterOptions.
Add MissingRequiredParameterError typed error for required param detection.
Delete ComputeStyleFunc/ComputeBindFunc — templates hardcode function names.
Fix Fiber receiver template to use url.ParseQuery instead of c.Queries().

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

Author: deepmap-marcinr

codegen/internal/gather_operations.go

@@ -231,16 +231,6 @@ func (g *operationGatherer) gatherParameter(param *v3.Parameter) (*ParameterDesc
 		required = *param.Required
 	}
 
-	styleFunc := ComputeStyleFunc(style)
-	bindFunc := ComputeBindFunc(style, param.In)
-
-	// When a runtime package is configured, prefix function names so generated
-	// code references them from the runtime package (e.g., "params.StyleSimpleParam").
-	if g.ctx != nil && g.ctx.RuntimeParamsPrefix() != "" {
-		styleFunc = g.ctx.RuntimeParamsPrefix() + styleFunc
-		bindFunc = g.ctx.RuntimeParamsPrefix() + bindFunc
-	}
-
 	desc := &ParameterDescriptor{
 		Name:     param.Name,
 		GoName:   goName,
@@ -253,9 +243,6 @@ func (g *operationGatherer) gatherParameter(param *v3.Parameter) (*ParameterDesc
 		Schema:   schemaDesc,
 		TypeDecl: typeDecl,
 
-		StyleFunc: styleFunc,
-		BindFunc:  bindFunc,
-
 		IsStyled:      isStyled,
 		IsPassThrough: isPassThrough,
 		IsJSON:        isJSON,

codegen/internal/operation.go

@@ -131,10 +131,6 @@ type ParameterDescriptor struct {
 	Schema   *SchemaDescriptor
 	TypeDecl string // Go type declaration (e.g., "string", "[]int", "*MyType")
 
-	// Precomputed function names for templates
-	StyleFunc string // "StyleSimpleParam", "StyleFormExplodeParam", etc.
-	BindFunc  string // "BindSimpleParam", "BindFormExplodeParam", etc.
-
 	// Encoding modes
 	IsStyled      bool // Uses style/explode serialization (most common)
 	IsPassThrough bool // No styling, just pass the string through
@@ -195,6 +191,15 @@ func (p *ParameterDescriptor) SchemaFormat() string {
 	return ""
 }
 
+// AllowReserved returns whether this parameter's value may contain RFC 3986
+// reserved characters without percent-encoding.
+func (p *ParameterDescriptor) AllowReserved() bool {
+	if p.Spec != nil {
+		return p.Spec.AllowReserved
+	}
+	return false
+}
+
 // RequestBodyDescriptor describes a request body for a specific content type.
 type RequestBodyDescriptor struct {
 	ContentType string // "application/json", "multipart/form-data", etc.
@@ -270,21 +275,6 @@ type SecurityRequirement struct {
 
 // Helper functions for computing descriptor fields
 
-// ComputeStyleFunc returns the style function name for a parameter.
-func ComputeStyleFunc(style string) string {
-	return "Style" + ToCamelCase(style) + "Param"
-}
-
-// ComputeBindFunc returns the bind function name for a parameter.
-// Query parameters use a separate entry point that takes url.Values.
-func ComputeBindFunc(style string, location string) string {
-	base := "Bind" + ToCamelCase(style)
-	if location == "query" {
-		return base + "QueryParam"
-	}
-	return base + "Param"
-}
-
 // ComputeBodyNameTag returns the name tag for a content type.
 func ComputeBodyNameTag(contentType string) string {
 	switch {