swarm UI: log an agent into claude from its card; the credentials go to bao and the agent picks them up

A new swarm service, `swarm-claude-login`, in its own container on the host
that sets `deploy.claude-login.enable` (defaulted on by `allSwarmServices`
where the host has the minter's store leaf, like the review classifier).

- swarm-ui: an agent card showing "login needed" gets a "log in" button.
  Its dialog starts the login, shows the URL claude printed, and takes the
  pasted code.
- swarm-controller: `POST/DELETE /api/agents/{name}/claude-login` and
  `POST /api/agents/{name}/claude-login/code`, behind the swarm UI's
  authelia-gated `/api/`, relay the steps to the minter as requests on
  `$SWARM.claude-login.request`.
- swarm-claude-login: runs `claude auth login` over piped stdio with HOME
  and CLAUDE_CONFIG_DIR in a per-login scratch dir, scrapes the first
  https URL, writes the code to stdin, and stores the `.credentials.json`
  at `swarm/agents/<agent>/claude-credentials` with a KV v2 write, a new
  version over any earlier one. The scratch dir goes on every exit path; a
  login waits 15 minutes for its code.
- hive-agent: while parked in `wait_for_login`, reads that leaf every 30 s
  under the agent's own cert and installs it only when its KV version is
  newer than the one recorded in `<harness>/claude-credentials-version`.
  An equal or older version is never put back, because claude rotates the
  refresh token and the stored copy is stale after the first refresh.
- swarm-secret-client: `claude_login` paths and `SecretStore::read_versioned`.
- Credentials: a `claude-login` store leaf minted by glue-bao-tls, a
  `swarm-claude-login` policy (create/update on
  `swarm/agents/+/claude-credentials`, read on its own queue client
  secret), an authelia machine client, and a `--claude-login-client`
  grant in the queue's auth-callout responder. The unit runs as a static
  system user.

The hive's own web-UI login is unchanged.

Refs #5268

frontend/packages/swarm-ui/src/agent/roster/AgentCard.tsx

@@ -12,11 +12,13 @@
 // `WantedMenu` below keeps its own clicks (mouse or keyboard-synthesized,
 // `WantedMenu` hosts real `<button>`s) from also firing `Card`'s
 // `onClick` and opening the detail panel.
+import { useState } from "preact/hooks";
 import { Badge } from "@hive/shared/badge.js";
 import type { ProblemDetails } from "@hive/shared/api-error.js";
 import { Card } from "../../ui/card/Card.js";
 import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import { AgentIcon } from "../AgentIcon.js";
+import { ClaudeLoginDialog } from "../claude-login/ClaudeLoginDialog.js";
 import { FRESHNESS, showsLoginNeeded, type AgentRow } from "../AgentTypes.js";
 import { WantedMenu } from "./WantedMenu.js";
 import "./AgentCard.css";
@@ -45,6 +47,7 @@ export function AgentCard({
   onOpenDetail: (row: AgentRow) => void;
 }) {
   const { tone, label } = FRESHNESS[row.freshness];
+  const [loggingIn, setLoggingIn] = useState(false);
   return (
     <Card selected={selected} onClick={() => onOpenDetail(row)}>
       <div class="ui-agent-card-row">
@@ -72,11 +75,28 @@ export function AgentCard({
               }
             />
             {showsLoginNeeded(row) ? (
-              <Badge
-                tone="warning"
-                value="login needed"
-                title="the agent's claude has no session; its turns wait until it is logged in"
-              />
+              <span
+                class="ui-agent-card-login"
+                onClick={(e) => e.stopPropagation()}
+              >
+                <Badge
+                  tone="warning"
+                  value="login needed"
+                  title="the agent's claude has no session; its turns wait until it is logged in"
+                />
+                <Badge
+                  variant="quiet"
+                  value="log in"
+                  title={`log ${row.name} in to claude from here`}
+                  onClick={() => setLoggingIn(true)}
+                />
+                {loggingIn ? (
+                  <ClaudeLoginDialog
+                    agent={row.name}
+                    onClose={() => setLoggingIn(false)}
+                  />
+                ) : null}
+              </span>
             ) : null}
             <span
               class="ui-agent-card-wanted"