docs: examples for every hard requirement + mort migration blueprint

Phase 7: nine runnable examples/ programs (parse, failover chains with
trailing alias, tiers, LLM_* env providers, multimodal, tool loop,
Generate[T], agent, skills); docs/mort-migration.md mapping mort's
go-llm/go-agentkit usage onto majordomo APIs with the planned additive
library extensions and conversion order; README finalized with the
complete matrix.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

examples/structured/main.go

@@ -0,0 +1,48 @@
+// Command structured demonstrates typed structured output: the JSON schema
+// is derived from a Go struct, mapped to the provider's native mechanism,
+// and the response is unmarshaled back into the struct.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+
+	"gitea.stevedudenhoeffer.com/steve/majordomo"
+)
+
+// Recipe is the shape we want back. Field tags document and constrain the
+// schema (`description`, `enum`); pointers mark nullable fields.
+type Recipe struct {
+	Name       string   `json:"name"`
+	Servings   int      `json:"servings"`
+	Difficulty string   `json:"difficulty" enum:"easy,medium,hard"`
+	Steps      []string `json:"steps" description:"short imperative steps"`
+	WinePair   *string  `json:"wine_pairing" description:"null if none appropriate"`
+}
+
+func main() {
+	model := flag.String("model", "ollama-cloud/minimax-m3:cloud", "model spec")
+	flag.Parse()
+
+	m, err := majordomo.Parse(*model)
+	if err != nil {
+		log.Fatalf("parse: %v", err)
+	}
+
+	recipe, err := majordomo.Generate[Recipe](context.Background(), m, majordomo.Request{
+		Messages: []majordomo.Message{majordomo.UserText("A weeknight mushroom risotto.")},
+	})
+	if err != nil {
+		log.Fatalf("generate: %v", err)
+	}
+
+	fmt.Printf("%s (serves %d, %s)\n", recipe.Name, recipe.Servings, recipe.Difficulty)
+	for i, s := range recipe.Steps {
+		fmt.Printf("  %d. %s\n", i+1, s)
+	}
+	if recipe.WinePair != nil {
+		fmt.Printf("wine: %s\n", *recipe.WinePair)
+	}
+}