fix(mcp): audit record keeps legacy name/index alias targets

A caller using the #38 aliases (name for repo, index for number) left no
target in the tools/call audit record.

Refs #64

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/mcp/audit_test.go

@@ -121,3 +121,15 @@ func TestToolsCallAuditOmitsArgumentValuesOtherThanTarget(t *testing.T) {
 	assert.NotContains(t, string(raw), sentinel)
 	assert.Contains(t, recs[0], "args_bytes")
 }
+
+// #38 keeps `name` (for repo) and `index` (for number) as legacy aliases; a
+// caller using them must still leave a target in the audit record.
+func TestToolsCallAuditRecordsLegacyAliasTargets(t *testing.T) {
+	recs := captureAudit(t, func() {
+		callTool(t, auditServer(auditStubTool{name: "issue_close"}), "issue_close",
+			map[string]any{"owner": "mathias", "name": "infra", "index": 7})
+	})
+	require.Len(t, recs, 1)
+	assert.Equal(t, "infra", recs[0]["name"])
+	assert.EqualValues(t, 7, recs[0]["index"])
+}