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/skillexample/main.go

@@ -0,0 +1,42 @@
+// Command skillexample demonstrates skills: reusable instruction+tool
+// bundles attached to an agent on demand — here the ready-made clock and
+// calc skills, which require tool use for time and arithmetic.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+
+	"gitea.stevedudenhoeffer.com/steve/majordomo"
+	"gitea.stevedudenhoeffer.com/steve/majordomo/agent"
+	"gitea.stevedudenhoeffer.com/steve/majordomo/skill/calc"
+	"gitea.stevedudenhoeffer.com/steve/majordomo/skill/clock"
+)
+
+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)
+	}
+
+	a := agent.New(m, "You are a precise assistant.")
+	a.AddSkill(clock.New()) // time_now / time_convert + instructions
+	a.AddSkill(calc.New())  // calculate + instructions
+
+	res, err := a.Run(context.Background(),
+		"How many minutes are left until midnight UTC? Use your tools, then show the calculation.")
+	if err != nil {
+		log.Fatalf("run: %v", err)
+	}
+	fmt.Println(res.Output)
+	for _, step := range res.Steps {
+		for _, r := range step.Results {
+			fmt.Printf("  tool %s → %s\n", r.Name, r.Content)
+		}
+	}
+}