feat(param): wire semantic alias table into PreParse; pilot calendar event list

Unify runtime morphology on pkg/cmdutil.Morph (same function the generator uses),
add a SemanticAliasHandler that looks up the embedded generated table after
morphological normalization and rewrites synonyms to the command's canonical flag
(leaving blocked/ambiguous synonyms untouched for the did-you-mean path), and
thread the command CLIPath through the pipeline Context. Pilot the mechanism on
'calendar event list' by removing its hand-written hidden spelling variants; a
behaviour-preservation test locks the outcome.

internal/pipeline/cobra.go

@@ -53,7 +53,11 @@ func RunPreParse(root *cobra.Command, engine *Engine) {
 	}
 
 	ctx := &Context{
-		Args:      append([]string{}, rawArgs...),
+		Args: append([]string{}, rawArgs...),
+		// target.CommandPath() still carries the "dws" prefix; PreParse
+		// handlers that key off a command (e.g. the semantic-alias table)
+		// normalize it themselves, so the runtime key matches the build key.
+		Command:   target.CommandPath(),
 		FlagSpecs: flagInfos,
 	}