Wire the box helpers into the worker HTTP server as /box/* routes,
authed by the internal bearer token like every other worker route.
Adds a boxRoute matcher (/^\/box\/(status|lifecycle|tree|file)$/) and
dispatches before jobRoute; missing user -> 400, unknown lifecycle
action -> 400, containment throws -> 400 (server keeps serving).
Manual verification (harness on :3922, internal token, user gabriel):
GET /box/status?user=gabriel -> 200 {"status":{...running:false...}}
GET /box/status (no user) -> 400 {"error":"Missing user"}
(no Authorization header) -> 401
POST /box/lifecycle {"action":"bogus"} -> 400 {"error":"Unknown action"}
GET /box/tree?user=gabriel -> 200 {"tree":{"name":"~",...}}
PUT /box/file {"path":"spoon-test.txt","content":"hi from task4"} -> 200 {"success":true}
GET /box/file?path=spoon-test.txt -> 200 {"path":...,"content":"hi from task4"}
GET /box/file?path=../../../../../etc/passwd -> 400 {"error":"Refusing to access path outside home: ..."}
GET /box/status after escape -> 200 (no crash)
GET /box/other?user=gabriel -> 404 {"error":"Not found"}
