test(02-02): add failing tests for fuzzy match + switch workspace

- TestFuzzyMatchByLabel, TestFuzzyMatchByBranch, TestFuzzyMatchByCwd
- TestFuzzyMatchPriority (label wins over branch)
- TestFuzzyMatchNoResult, TestFuzzyMatchCaseInsensitive
- TestSwitchToWorkspace, TestSwitchToWorkspaceError, TestSwitchToWorkspaceI3Error

i3bridge.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	i3 "go.i3wm.org/i3/v4"
+)
+
+// I3Commander abstrait i3.RunCommand pour testabilite.
+type I3Commander interface {
+	RunCommand(command string) ([]i3.CommandResult, error)
+}
+
+// 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 {
+	return nil
+}
+
+// SwitchToWorkspace bascule vers le workspace indique via i3 IPC.
+func SwitchToWorkspace(commander I3Commander, wsName string) error {
+	return nil
+}