feat(tools): add ToolSkill metadata handling for community tool system

- ToolSkill struct with Name, Description, Tags, UsageCount
- LoadToolSkill() to read and parse tool skill files
- Extract tags from content if not in frontmatter

pkg/tools/toolskill.go

@@ -0,0 +1,53 @@
+// pkg/tools/toolskill.go
+package tools
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+type ToolSkill struct {
+	Name        string                 `yaml:"name"`
+	Description string                 `yaml:"description"`
+	Type        string                 `yaml:"type"`
+	Tags        []string               `yaml:"tags"`
+	Version     string                 `yaml:"version"`
+	UsageCount  int                    `yaml:"usage_count"`
+	LastUsed    string                 `yaml:"last_used"`
+	Metadata    map[string]interface{} `yaml:",inline"`
+}
+
+// LoadToolSkill reads a tool skill file and parses it
+func LoadToolSkill(filePath string) (*ToolSkill, error) {
+	data, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	var skill ToolSkill
+	if err := yaml.Unmarshal(data, &skill); err != nil {
+		return nil, err
+	}
+
+	// Extract tags from content if not in frontmatter
+	if len(skill.Tags) == 0 {
+		skill.Tags = extractTagsFromContent(string(data))
+	}
+
+	return &skill, nil
+}
+
+// extractTagsFromContent extracts tags from markdown content
+func extractTagsFromContent(content string) []string {
+	// Look for #tag patterns
+	re := strings.NewReplacer(`#([a-zA-Z0-9_-]+)`, `$1`)
+	matches := re.FindAllStringSubmatch(content, -1)
+	tags := make([]string, 0, len(matches))
+	for _, m := range matches {
+		tags = append(tags, m[1])
+	}
+	return tags
+}