feat(html): Metadata alias on Context + Responsive.Add with media-query hint

Brings the portable pieces of mini's feat/main-session-work onto dev:

- context.go: Context.Metadata field — alias for Data, references the same
  underlying map. Both fields interchangeable at read/write sites.
- responsive.go: responsiveVariant gains an optional media field for CSS
  media-query hints (e.g. "(min-width: 1024px)"); new Responsive.Add(name,
  layout, media...) method. Existing Variant(name, layout) becomes a thin
  alias over Add.
- go.mod: drop stale dappco.re/go/core/{inference,log} indirect requires
  (refreshed by go mod tidy — forge.lthn.ai/core/{go-inference,go-log}).

Mini's local deps/go-i18n/reversal grammar-vector rewrite does not apply to
dev: dev consumes reversal as an external package (dappco.re/go/core/i18n/reversal)
rather than an internal fork. That portion of the branch is left on
feat/main-session-work for future re-integration.

Verified: GOWORK=off go build ./... + go test ./... passes.

Co-Authored-By: Virgil <virgil@lethean.io>

context.go

@@ -11,11 +11,15 @@ type Translator interface {
 
 // Context carries rendering state through the node tree.
 // Usage example: ctx := NewContext()
+//
+// Metadata is an alias for Data — both fields reference the same underlying map.
+// Treat them as interchangeable; use whichever reads best in context.
 type Context struct {
 	Identity     string
 	Locale       string
 	Entitlements func(feature string) bool
 	Data         map[string]any
+	Metadata     map[string]any
 	service      Translator
 }
 
@@ -39,8 +43,10 @@ func applyLocaleToService(svc Translator, locale string) {
 // NewContext creates a new rendering context with sensible defaults.
 // Usage example: html := Render(Text("welcome"), NewContext("en-GB"))
 func NewContext(locale ...string) *Context {
+	data := make(map[string]any)
 	ctx := &Context{
-		Data: make(map[string]any),
+		Data:     data,
+		Metadata: data, // alias — same underlying map
 	}
 	if len(locale) > 0 {
 		ctx.SetLocale(locale[0])

go.mod

@@ -12,8 +12,8 @@ require (
 )
 
 require (
-	dappco.re/go/core/inference v0.1.4 // indirect
-	dappco.re/go/core/log v0.0.4 // indirect
+	forge.lthn.ai/core/go-inference v0.1.4 // indirect
+	forge.lthn.ai/core/go-log v0.0.4 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	golang.org/x/text v0.35.0 // indirect

responsive.go

@@ -18,6 +18,7 @@ type Responsive struct {
 type responsiveVariant struct {
 	name   string
 	layout *Layout
+	media  string // optional CSS media-query hint (e.g. "(min-width: 768px)")
 }
 
 // NewResponsive creates a new multi-variant responsive compositor.
@@ -29,11 +30,24 @@ func NewResponsive() *Responsive {
 // Variant adds a named layout variant (e.g., "desktop", "tablet", "mobile").
 // Usage example: NewResponsive().Variant("desktop", NewLayout("HLCRF"))
 // Variants render in insertion order.
+// Variant is equivalent to Add(name, layout) with no media-query hint.
 func (r *Responsive) Variant(name string, layout *Layout) *Responsive {
+	return r.Add(name, layout)
+}
+
+// Add registers a responsive variant. The optional media argument carries a
+// CSS media-query hint for downstream CSS generation (e.g. "(min-width: 768px)").
+//
+// Usage example: NewResponsive().Add("desktop", NewLayout("HLCRF"), "(min-width: 1024px)")
+func (r *Responsive) Add(name string, layout *Layout, media ...string) *Responsive {
 	if r == nil {
 		r = NewResponsive()
 	}
-	r.variants = append(r.variants, responsiveVariant{name: name, layout: layout})
+	variant := responsiveVariant{name: name, layout: layout}
+	if len(media) > 0 {
+		variant.media = media[0]
+	}
+	r.variants = append(r.variants, variant)
 	return r
 }