mesh-issues: take every condition key the controller raises, a delivery's with its slash among them (hq issue 475)

The tracker's own pattern refused the slash a delivery's id carries, so no issue
could track a delivery's condition and the operator's alert kept saying no issue
tracks it. Mirror the controller's key rule instead of a pattern of our own; a
router test proves a slashed key is matched and named end to end.

modules/mesh-issues/cmd/mesh-issues/conditionkey_test.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+// A condition link takes every key the controller raises (novox/hq issue 475). The keys are real: the delivery's
+// as `mesh-controller.status` named it when the link was refused, the others as `mesh-controller.conditions`
+// answered on 2026-10-11.
+var realConditionKeys = []string{
+	"delivery.novox/mesh-controller_d2e9dc61590f.stalled", // a delivery's id carries its repository, owner/name
+	"machine.novox.telegram.telegram-token.secret-given",
+	"module.openrazer.shanks.relogin-needed",
+	"mesh.hand-acts.plans_go.healer-wanted", // a space in the id, made `_` by the controller
+	"delivery.leaf.over-budget",
+}
+
+func TestAConditionLinkTakesEveryKeyTheControllerRaises(t *testing.T) {
+	h := newHarness(t)
+	n := h.open(t, "a delivery stalls", "mesh-catalog")
+	for _, k := range realConditionKeys {
+		if _, err := h.Link(LinkAsk{Number: n, Kind: LinkCondition, Target: k}); err != nil {
+			t.Errorf("%s: %v", k, err)
+		}
+	}
+	got, err := h.Tracking([]string{realConditionKeys[0]})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if is := got.Conditions[realConditionKeys[0]]; len(is) != 1 || is[0].Number != n || got.Said != "Issues track 1 condition." {
+		t.Fatalf("the delivery's condition is not said tracked: %+v", got)
+	}
+}
+
+// What the controller never raises is refused, so a link never names a condition that cannot exist.
+func TestAConditionLinkRefusesWhatTheControllerNeverRaises(t *testing.T) {
+	for _, k := range []string{
+		"",
+		"delivery.stalled",             // no id: a key is scope, id and kind
+		"weather.novox.rain",           // no scope the controller knows
+		"machine..secret-given",        // an empty token
+		"machine.novox.secret given",   // a space the controller makes `_`
+		"machine.novox:1.secret-given", // a colon the controller makes `_`
+		"delivery.novox/mesh-controller@d2e9dc61590f.stalled", // `@` too
+		"machine.*.silent",         // a wildcard on the bus
+		"machine.>",                // a wildcard on the bus
+		"machine.ace.silent\nmore", // a second line
+		"machine." + strings.Repeat("a", 300) + ".silent",
+	} {
+		if _, err := checkTarget(LinkCondition, k); err == nil {
+			t.Errorf("%q was taken as a condition's key", k)
+		}
+	}
+}