feat(docs): regenerate CHAMPIONS.md from champions.json in scraper

- Add saveMarkdown in markdown.go rendering the Loldle classic-mode column
  table (Champion | Gender | Genre | Range | Resource | Region | Lane | Year).
- main.go writes CHAMPIONS.md after champions.json on every scrape.
- update-champions.yml stages CHAMPIONS.md alongside champions.json so CI
  commits both in lockstep.
- alt text on tile images now uses champion display name (e.g. Bel'Veth)
  instead of the ID slug.

data/markdown.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/tiennm99/loldle-data/parser"
+)
+
+// saveMarkdown renders champions as a human-readable table matching the
+// Loldle classic-mode column order: Champion | Gender | Genre | Range |
+// Resource | Region | Lane | Year.
+func saveMarkdown(path string, champions []parser.ChampionResult) error {
+	var b strings.Builder
+
+	fmt.Fprintln(&b, "# Champions")
+	fmt.Fprintln(&b)
+	fmt.Fprintf(&b, "Auto-generated from [`champions.json`](./champions.json). Total: **%d** champions.\n", len(champions))
+	fmt.Fprintln(&b)
+	fmt.Fprintln(&b, "Columns match Loldle classic mode: Champion | Gender | Genre (class) | Range | Resource | Region | Lane | Year.")
+	fmt.Fprintln(&b)
+	fmt.Fprintln(&b, "| | Champion | Gender | Genre | Range | Resource | Region | Lane | Year |")
+	fmt.Fprintln(&b, "|---|---|---|---|---|---|---|---|---|")
+
+	for _, c := range champions {
+		year := "—"
+		if c.ReleaseDate != 0 {
+			year = fmt.Sprintf("%d", c.ReleaseDate)
+		}
+		fmt.Fprintf(&b,
+			"| %s | **%s**<br/><sub>%s</sub> | %s | %s | %s | %s | %s | %s | %s |\n",
+			tileIcon(c.ID, c.Name),
+			c.Name,
+			c.Title,
+			formatGender(c.Gender),
+			formatMulti(c.Genre),
+			formatRange(c.AttackType),
+			orDash(c.Resource),
+			formatRegion(c.Region),
+			formatMulti(c.Lane),
+			year,
+		)
+	}
+
+	return os.WriteFile(path, []byte(b.String()), 0o644)
+}
+
+func tileIcon(id, alt string) string {
+	return fmt.Sprintf(
+		`<img src="https://ddragon.leagueoflegends.com/cdn/img/champion/tiles/%s_0.jpg" width="32" height="32" alt="%s"/>`,
+		id, alt,
+	)
+}
+
+func formatGender(v string) string { return orDash(capitalize(v)) }
+
+func formatRange(v string) string {
+	switch v {
+	case "close":
+		return "Melee"
+	case "range":
+		return "Ranged"
+	default:
+		return "—"
+	}
+}
+
+// formatMulti splits comma-separated values, trims, capitalizes each, rejoins with ", ".
+func formatMulti(v string) string {
+	if v == "" {
+		return "—"
+	}
+	parts := strings.Split(v, ",")
+	out := make([]string, 0, len(parts))
+	for _, p := range parts {
+		p = strings.TrimSpace(p)
+		if p == "" {
+			continue
+		}
+		out = append(out, capitalize(p))
+	}
+	if len(out) == 0 {
+		return "—"
+	}
+	return strings.Join(out, ", ")
+}
+
+// formatRegion splits dash-separated regions (e.g. "shadow-isles") and title-cases each.
+func formatRegion(v string) string {
+	if v == "" {
+		return "—"
+	}
+	parts := strings.Split(v, "-")
+	for i, p := range parts {
+		parts[i] = capitalize(p)
+	}
+	return strings.Join(parts, " ")
+}
+
+func capitalize(s string) string {
+	if s == "" {
+		return s
+	}
+	return strings.ToUpper(s[:1]) + s[1:]
+}
+
+func orDash(s string) string {
+	if s == "" {
+		return "—"
+	}
+	return s
+}