The in-process tool loopback stamps current_user = "internal-tool" and
require_admin grants admin to that sentinel; it is also a reserved username.
That security-sensitive string was hand-typed in ~7 places (stamp, admin gate,
RESERVED_USERNAMES, and standalone admin-equivalent checks in note/research/
shell/task routes), where a typo silently breaks an auth gate.
Add INTERNAL_TOOL_USER in core/middleware.py next to INTERNAL_TOOL_TOKEN/
INTERNAL_TOOL_HEADER and use it at every such site. A typo is now an
ImportError, not a silent mismatch. auth.py importing middleware is acyclic
(middleware imports no app modules). Behaviour is unchanged.
The multi-sentinel sets bundling internal-tool with api/demo/system
(assistant_routes, task_scheduler, research_routes) are a separate reserved-set
dedup, left for a follow-up.
Closes#4332
Kenny Van de Maele
a2261c38c1