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/console/mcp.go

@@ -4,6 +4,7 @@
 package console
 
 import (
+	"context"
 	"encoding/json"
 	"os"
 	"strings"
@@ -103,7 +104,11 @@ func idOrNull(id json.RawMessage) json.RawMessage {
 }
 
 // Handle answers one request; nil for a notification, which expects none.
-func (s *Surface) Handle(r Request) *Reply {
+func (s *Surface) Handle(r Request) *Reply { return s.HandleContext(context.Background(), r) }
+
+// HandleContext answers one request for as long as ctx lasts: a wait whose client hung up or cancelled
+// ends at once, its subscription closed (the review of issue 745).
+func (s *Surface) HandleContext(ctx context.Context, r Request) *Reply {
 	notification := isNotification(r.ID)
 	switch r.Method {
 	case "initialize":
@@ -164,7 +169,7 @@ func (s *Surface) Handle(r Request) *Reply {
 			if p.Arguments == nil {
 				p.Arguments = map[string]any{}
 			}
-			return answer(r.ID, s.discover(p.Name, p.Arguments))
+			return answer(r.ID, s.discover(ctx, p.Name, p.Arguments))
 		}
 		args := map[string]any{}
 		for k, v := range p.Arguments {
@@ -305,7 +310,8 @@ func (s *Surface) instructions() string {
 		"whole (novox/hq ADR 0195). mesh_overview shows the mesh's seats and machines; mesh_machine one " +
 		"machine's seats and modules; mesh_search finds a tool by words; mesh_describe gives one tool's " +
 		"arguments; mesh_call calls it; mesh_runtimes says which machines' runtimes answered discovery, how fast " +
-		"and how much — ask it when an address is said to be missing or on another machine. " + grammar + " What may be called was fixed when this account " +
+		"and how much — ask it when an address is said to be missing or on another machine; mesh_wait waits on the " +
+		"bus for an event instead of polling (novox/hq ADR 0367). " + grammar + " What may be called was fixed when this account " +
 		"was issued, so a refusal means the account, not the tool."
 }