Splits the `discover_acp_providers` Tauri command into a cheap cached
path and an explicit forced re-discovery path.
The profiling flight-recorder identified `discover_acp_providers` as the
acute UI-freeze correlate: a 20–65s probe pipeline (PATH re-fetch, CLI
auth probes, process spawns) was running on routine renders like channel
switches, because hot surfaces remounted the wrapping query and
automatic staleness refetches re-ran the full pipeline. This is
complementary to the idle auto-reload (#5588) and bounded-accumulator
(#5596) work.
## Backend
- Added a `force` parameter to `discover_acp_providers` /
`discover_acp_runtimes_from`. The default (cheap) path serves cached
availability and auth statuses with zero process spawns; `force: true`
runs the full pipeline (cache clear, PATH re-fetch, CLI auth probes).
- Added a single-flight coalescer (`forced_single_flight`) so concurrent
forced runs share one probe instead of stacking.
- Extracted the auth-status cache and `resolve_auth_statuses` into
`discovery/auth_status_cache.rs`.
## Renderer
- Raised `staleTime` to 30 min; forced refresh flows only through an
explicit `fetchQuery` path (`refreshAcpRuntimes`), so automatic
staleness refetches can never re-run probes.
- Added `useAcpRuntimesQueryForced` for Settings and onboarding
surfaces; connect/install/save/delete mutations force-refresh in
`onSettled`.
- Switched `SetupStep`, `HarnessCatalogDialog`, and
`HarnessesSettingsPanel` to the forced hook.
## Structure
The touched files were at or over the grandfathered 1000-line file-size
ceiling, so the change is delivered as cohesive extractions rather than
in-place growth: `forced_single_flight.rs`, `auth_status_cache.rs`,
`discovery/tests/forced_discovery.rs`, `acpRuntimesQuery.ts`, and
`tauriAcpDiscovery.ts`. Dependencies are one-directional (`hooks.ts`
imports from `acpRuntimesQuery.ts` and re-exports the forced hook, so
consumer imports are unchanged; no import cycle).
## Tests
Added Rust tests pinning the cheap-vs-forced split: a probe is spawned
only when forced, the cheap path reuses the cache, and auth status is
`Unknown` before any probe runs.
---------
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>
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