feat(permissions): per-desk till guards, jobs in the role composer, permission-scoped live feed; role reassignment applies without re-login

Permissions matrix rethink (wiki/decisions/venue-modules.md §"Permissions matrix",
open-questions #16) — the grid stays the enforcement layer:

- Move 1: each desk's money is guarded by that desk's own permissions. Manifest
  tillGuards {read, shift, cash}: booth = shift:read / shift:create / drawer:create
  (unchanged), carwash = carwash:read / carwash:cash (new). Shift + drawer routes
  resolve the guard FROM THE TILL (requireTill); a wash role holds no shift:* and cannot
  touch the booth by construction. Replaces the session:read borrowing (tillPermission).
  /api/shift/tills lists the role's readable tills with canWork; history/movements
  without a till filter return the union of readable tills.
- Move 2: jobs — manifest permission bundles (booth-operator, booth-supervisor,
  merchant, wash-operator) as one-click chips in Setup → Roles, with "mixes desks" and
  "partial job" lints (warnings, never blocks).
- Move 3: the live WebSocket admits any watch permission (event/session/device read or
  a module's feedPermission) and filters every push per role; report:read is the
  reports screen only.

Auth: the token's roleId is only a hint — refreshRole() after every jwtVerify resolves
the user's CURRENT role (cached, bumped on role/user writes), so reassigning a user's
role applies on the next request and a deleted user's session ends with 401.

Tests: till guards + look-only role, feed rules, every job's permissions exist, role
reassignment without re-login. 353/353.

Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU

wiki/decisions/open-questions.md

@@ -138,3 +138,11 @@ procurement. (See [[parking-system-architecture]] §10.)
     payment lands on the wash operator's own till, never the booth's). Open: vision category
     flag, bay camera, the Bar's scope. Full design and the remaining questions on
     [[venue-modules]].
+
+16. **Permissions matrix after venue modules.** _(Raised by the user, 2026-09-05.)_ The flat
+    `resource:action` grid was composed for one desk; a second desk (Car Wash) exposed borrowed
+    meanings (`session:read` as "works the booth till", `report:read` as "may open the socket")
+    and a composer at the wrong altitude. Decision + three moves (per-desk till guards, jobs on
+    top of the grid, a permission-scoped live feed) on [[venue-modules]] §"Permissions matrix";
+    moves built 2026-09-05. Open: default supervisor bundle, re-applying jobs after a module
+    update, signing role edits.