End every wait in flight when the tool runner stops (issue 745)

Closing the console shut its server down with a context that never ends, so a stop or restart of
the tool runner waited on any mesh_wait in flight for up to ten minutes. The server's base context
is now cancelled first, ending every wait at once, with a five-second shutdown as a backstop
(second review of issue 745).

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

node-tools/internal/bus/bus.go

@@ -76,6 +76,9 @@ type Membership struct {
 	// Hears are the module streams the module hears, each through a durable consumer on that stream the
 	// runtime binds beside the one on EVENTS (ADR 0363 §8).
 	Hears []HeardIssued `json:"hears,omitempty"`
+	// Waits are the event families a session may wait on through the mesh MCP server (novox/hq ADR 0367 §2):
+	// the tool runner's alone, composed from its manifest with the grant that lets it subscribe them.
+	Waits []WaitIssued `json:"waits,omitempty"`
 }
 
 // Served is an address a tool is answered on; `{tool}` stands for the tool's name.
@@ -181,6 +184,8 @@ type Conn struct {
 	RetryAfter []time.Duration
 	// calls are the caller-named calls in flight (caller.go, novox/hq issue 365).
 	calls callers
+	// waits are the waits in flight by subject, each told when the bus refuses its subscription (wait.go).
+	waits map[string]map[chan string]bool
 }
 
 // answered is one subject the runtime answers on: what to subscribe again with, and how often it was
@@ -218,6 +223,9 @@ func (c *Conn) refused(err error) {
 	if c.publishRefused(err) {
 		return
 	}
+	if subject := subjectRefused(err); subject != "" && c.waitRefused(subject) {
+		return
+	}
 	m := refusedSubject.FindStringSubmatch(err.Error())
 	if len(m) < 2 {
 		return