feat(02-02): implement fuzzy match + switch workspace + i3 commander

- FuzzyMatch searches label > branch > cwd (case-insensitive)
- SwitchToWorkspace sends 'workspace number N' via I3Commander interface
- RealI3Commander wraps go.i3wm.org/i3/v4 RunCommand
- 9 tests covering priority, no-match, case-insensitive, errors

i3bridge.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"fmt"
+	"strings"
+
 	i3 "go.i3wm.org/i3/v4"
 )
 
@@ -9,13 +12,55 @@ type I3Commander interface {
 	RunCommand(command string) ([]i3.CommandResult, error)
 }
 
+// RealI3Commander utilise go.i3wm.org/i3/v4 directement.
+type RealI3Commander struct{}
+
+func (c RealI3Commander) RunCommand(cmd string) ([]i3.CommandResult, error) {
+	return i3.RunCommand(cmd)
+}
+
 // FuzzyMatch trouve la premiere session matchant query dans : label > branche > cwd.
 // Case-insensitive. Retourne nil si aucun match.
 func FuzzyMatch(query string, sessions []SessionInfo) *SessionInfo {
+	q := strings.ToLower(query)
+
+	// Priorite 1 : label
+	for i := range sessions {
+		if sessions[i].Label != "" && strings.Contains(strings.ToLower(sessions[i].Label), q) {
+			return &sessions[i]
+		}
+	}
+
+	// Priorite 2 : branche git
+	for i := range sessions {
+		if strings.Contains(strings.ToLower(sessions[i].GitBranch), q) {
+			return &sessions[i]
+		}
+	}
+
+	// Priorite 3 : cwd
+	for i := range sessions {
+		if strings.Contains(strings.ToLower(sessions[i].Cwd), q) {
+			return &sessions[i]
+		}
+	}
+
 	return nil
 }
 
 // SwitchToWorkspace bascule vers le workspace indique via i3 IPC.
 func SwitchToWorkspace(commander I3Commander, wsName string) error {
+	cmd := fmt.Sprintf("workspace number %s", wsName)
+	results, err := commander.RunCommand(cmd)
+	if err != nil {
+		return fmt.Errorf("i3 RunCommand: %w", err)
+	}
+
+	for _, r := range results {
+		if !r.Success {
+			return fmt.Errorf("i3 workspace switch failed: %s", r.Error)
+		}
+	}
+
 	return nil
 }