mesh-issues: check every new issue for a duplicate; claude-code: one judgement with no tools (hq ADR 0278)

The operator asked for duplicate issues to be consolidated as they are opened.
The tracker consumes its own opened event and asks the agent on its node, through
claude-code's new claude_code_judge, whether an older issue not resolved asks the
same question; it closes only the newer issue of a certain duplicate, keeping its
report on the older one, and fails loudly when it cannot judge. groom runs the
same judgement over the backlog as a dry run, applied on confirm.

modules/claude-code/cmd/claude-code/main.go

@@ -355,6 +355,7 @@ func tools(p Paths, servers ServerState, view *ServerView, config ConfigState, c
 		Description: "Read-only: everything registered through this module that a Claude Code session runs or obeys — the tool servers, the hooks, the settings and the skills, subagents, commands, output styles and instructions — by key, with who registered it, when, and whether it is still rendered (novox/hq issue 340), beside what the operator set for this node at the controller's terminal (managed_settings, mcp_servers). `by` is the node whose tool runner served the call, never the caller.",
 		Run:         func(map[string]any) (any, error) { return Registrations(p, servers, config) }})
 	out = append(out, proposalTools(p)...)
+	out = append(out, judgeTool(NewJudge(p)))
 	return append(out, configTools(p, config, configView)...)
 }