# WP-33 — In-app dev switchers (scenario + role)

Status: done
Phase: 7 — refinements

## Why

The two dev-only stand-ins — the async `?scenario=` toggle (`scenario.interceptor.ts`) and the
faked `?role=` (`role.interceptor.ts`) — were driven by hand-editing the URL query string.
Awkward for demos: you had to remember the valid values and retype them. This WP surfaces both
as dropdowns in the existing dev panel so a scenario/role can be flipped with a click.

## Decisions (pre-made, don't relitigate)

- **No new component/shell wiring.** The switchers live inside the existing `debug-state`
  devtool (the sanctioned dev-only fab/panel already mounted in the shell under `isDevMode()`).
- **Reuse the mechanism modules, don't duplicate their source of truth.** `scenario.ts`/`role.ts`
  gain a `set*` setter + an exported valid-values list; the panel imports them. `debug-state` is
  added to the `ui→infrastructure` eslint exemption (same precedent as its existing cross-context
  exemption) rather than re-declaring the storage keys / valid lists in the UI.
- **Scenario becomes tab-sticky (sessionStorage), mirroring role.** Without this the switcher
  would be near-useless: navigation drops the query param and reverts to `default` mid-demo.
- **Apply by `location.reload()`.** Both values are read per-request in interceptors and gate
  server-computed decision flags already fetched by eager `httpResource`s — a reload is the
  simplest correct way to re-run them. Acceptable for a dev tool.

## Files

- `shared/infrastructure/scenario.ts` — tab-sticky read (mirrors role), `setScenario`, exported
  `SCENARIOS`; co-located `scenario.spec.ts`.
- `shared/infrastructure/role.ts` — `setRole`, exported `ROLES`.
- `shared/ui/debug-state/debug-state.component.ts` — two `<select>`s in the panel.
- `eslint.config.mjs` — extend the debug-state devtool exemption to the ui→infrastructure rule.

## Acceptance criteria

- [x] Dev panel shows role + scenario dropdowns; changing one persists it and reloads.
- [x] Scenario survives navigation within the tab (sticky).
- [x] `npm run ci` green (lint, tests incl. new scenario spec, localized build).