feat: agent concurrency, conversation summaries, AI tools config, UI polish

- Agent slot limiter for concurrent tool execution
- Conversation summarization with soft-delete (MarkSummarized)
- ANSI stripping in terminal tool output
- Configurable crush-run timeout (default 600s, max 900s)
- Starship theme refactor, AI tools config grid, system update UI
- Streaming segments refactor, summarized messages block in feed
- CSS: headings, scrollbars, tool cards, summary block styles
- i18n additions (en+fr) for tools, updates, config

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/skills/skills.go

@@ -33,6 +33,7 @@ type Skill struct {
 	Dependencies []SkillDependency `yaml:"dependencies,omitempty" json:"dependencies,omitempty"`
 	Languages    []string          `yaml:"languages,omitempty" json:"languages,omitempty"`
 	Category     string            `yaml:"category,omitempty" json:"category,omitempty"`
+	Deployed     bool              `yaml:"-" json:"deployed,omitempty"`
 }
 
 type ValidationError struct {
@@ -155,6 +156,27 @@ func Delete(name string) error {
 	return nil
 }
 
+func IsDeployed(name string) bool {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return false
+	}
+	crushPath := filepath.Join(home, ".config", "crush", "skills", name, "SKILL.md")
+	claudePath := filepath.Join(home, ".claude", "skills", name, "SKILL.md")
+	_, crushErr := os.Stat(crushPath)
+	_, claudeErr := os.Stat(claudePath)
+	return crushErr == nil || claudeErr == nil
+}
+
+func Undeploy(name string) error {
+	skill, err := Get(name)
+	if err != nil {
+		return err
+	}
+	undeployFromTargets(skill.Name)
+	return nil
+}
+
 func Update(skill *Skill) error {
 	if errs := Validate(skill); len(errs) > 0 {
 		return fmt.Errorf("validation failed: %v", errs)