fix(skills): 兼容 Codex 最小元数据校验

doc/changes/skill-validator-codex-compat.md

@@ -0,0 +1,23 @@
+# Skill 元数据双模式校验
+
+维护者效率 Skill 使用 Codex/Agent Skill 的最小 frontmatter，只要求 `name` 和
+`description`。仓库原有校验器则无条件要求 `version`、`metadata.requires.bins`
+和 `metadata.cliHelp`，导致符合 Codex 规范的 Skill 在仓库测试中被误报。
+
+本次把校验调整为双模式：
+
+- 只声明 `name` 和 `description` 时，按 Codex 最小规范校验。
+- 一旦声明 `version`、`requires.bins` 或 `cliHelp` 中任一执行元数据，就继续要求
+  三项完整，并校验语义版本、`gitlink-cli` 依赖和命令帮助入口。
+- Skill 名称、目录一致性和描述长度规则保持不变。
+
+这样不会为了兼容 Codex 而放过不完整的旧版执行元数据，同时确保五个维护专项 Skill
+和 `gitlink-maintenance-orchestrator` 能通过仓库校验与 Codex `quick_validate.py`。
+
+验证命令：
+
+```bash
+go test ./internal/skillmeta \
+  -run 'TestValidateCatchesBadSkills|TestValidateAcceptsCodexMinimalFrontmatter' \
+  -count=1
+```

internal/skillmeta/validate.go

@@ -80,17 +80,25 @@ func validateSkill(root, name string) []Problem {
 	case fm.Name != name:
 		add("name", fmt.Sprintf("must equal the directory name %q", name))
 	}
-	if !semverRe.MatchString(fm.Version) {
-		add("version", "must be semantic version X.Y.Z")
-	}
 	if utf8.RuneCountInString(fm.Description) < minDescriptionRunes {
 		add("description", fmt.Sprintf("must be at least %d characters; it is the router's only routing signal", minDescriptionRunes))
 	}
-	if !containsString(fm.Metadata.Requires.Bins, "gitlink-cli") {
-		add("metadata.requires.bins", `must contain "gitlink-cli"`)
-	}
-	if strings.TrimSpace(fm.Metadata.CLIHelp) == "" {
-		add("metadata.cliHelp", "must name the command group, e.g. \"gitlink-cli x --help\"")
+	// Codex-compatible skills only require name and description. Once a skill
+	// opts into GitLink's legacy execution metadata, validate that block as a
+	// complete unit instead of accepting a partially configured declaration.
+	hasExecutionMetadata := fm.Version != "" ||
+		len(fm.Metadata.Requires.Bins) > 0 ||
+		strings.TrimSpace(fm.Metadata.CLIHelp) != ""
+	if hasExecutionMetadata {
+		if !semverRe.MatchString(fm.Version) {
+			add("version", "must be semantic version X.Y.Z")
+		}
+		if !containsString(fm.Metadata.Requires.Bins, "gitlink-cli") {
+			add("metadata.requires.bins", `must contain "gitlink-cli"`)
+		}
+		if strings.TrimSpace(fm.Metadata.CLIHelp) == "" {
+			add("metadata.cliHelp", "must name the command group, e.g. \"gitlink-cli x --help\"")
+		}
 	}
 	return ps
 }

internal/skillmeta/validate_test.go

@@ -1,6 +1,10 @@
 package skillmeta
 
-import "testing"
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
 
 // TestRepoSkillsValid treats the real skills/ registry as a regression
 // baseline: once fixed, every SKILL.md must keep passing the schema.
@@ -37,3 +41,29 @@ func TestValidateCatchesBadSkills(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateAcceptsCodexMinimalFrontmatter(t *testing.T) {
+	root := t.TempDir()
+	skillDir := filepath.Join(root, "gitlink-codex-minimal")
+	if err := os.Mkdir(skillDir, 0o755); err != nil {
+		t.Fatalf("create skill directory: %v", err)
+	}
+	src := []byte(`---
+name: gitlink-codex-minimal
+description: "A Codex-compatible skill with only the required routing metadata."
+---
+
+# Test skill
+`)
+	if err := os.WriteFile(filepath.Join(skillDir, "SKILL.md"), src, 0o644); err != nil {
+		t.Fatalf("write SKILL.md: %v", err)
+	}
+
+	problems, err := Validate(root)
+	if err != nil {
+		t.Fatalf("validate testdata: %v", err)
+	}
+	if len(problems) != 0 {
+		t.Fatalf("Codex-compatible minimal frontmatter must pass validation: %v", problems)
+	}
+}