Add task source provider availability reasons

Co-authored-by: Orca <help@stably.ai>

notes/host-context-implementation-checklist.md

@@ -276,3 +276,4 @@ Done means: reviewers and future agents can understand the vision, implementatio
 - [x] 2026-06-13: Guarded backend automation ownership for runtime-host repos: newly saved/updated runtime-owned automations now record `remote_host_service`, and main-process dispatch resolution skips runtime targets before desktop renderer dispatch until durable remote scheduling exists. Verified with persistence and automation service regressions, targeted oxlint, and full `pnpm run typecheck`.
 - [x] 2026-06-13: Preserved exact GitLab provider identity for item-specific Tasks flows by threading `GitLabWorkItem.projectRef` into the task source context used for detail pages and Start Workspace handoff. Verified with TaskPage source-boundary regression, targeted oxlint, and full `pnpm run typecheck`.
 - [x] 2026-06-13: Removed the redundant locked SSH target row from the Add Project remote-path step after the host has already been selected, while preserving a compact reconnect action for disconnected locked hosts. Fresh Electron validation connected a Docker SSH target through Orca's relay IPC, added `/home/orca/host-context-e2e-local` via Add Project, and created a remote SSH worktree at `/home/orca/goldfish`; screenshots were added to the dark-background report. Verified with focused Add Project tests, targeted oxlint, and remote filesystem checks.
+- [x] 2026-06-13: Extended Tasks source availability reasons so missing provider auth, unavailable source tooling, and unsupported providers can surface as distinct source-host states instead of generic connection/version failures. The checklist row remains partial until runtime/provider preflight feeds these reasons end to end. Verified with focused source-summary tests and targeted oxlint.

src/renderer/src/components/task-source-context-summary.test.ts

@@ -278,4 +278,45 @@ describe('task source context summary', () => {
       })?.label
     ).toBe('Some GitLab source hosts unavailable: 2 source hosts')
   })
+
+  it('shows provider-specific source availability reasons', () => {
+    expect(
+      getTaskSourceContextSummary({
+        provider: 'github',
+        providerLabel: 'GitHub',
+        selectedRepoCount: 1,
+        repoContexts: [
+          {
+            kind: 'task-source',
+            provider: 'github',
+            projectId: 'github:stablyai/orca',
+            hostId: 'ssh:devbox',
+            repoId: 'repo-1',
+            providerIdentity: { provider: 'github', owner: 'stablyai', repo: 'orca' }
+          }
+        ],
+        hostAvailability: [{ hostId: 'ssh:devbox', reason: 'missing-provider-auth' }]
+      })
+    ).toEqual({
+      label: 'GitHub · devbox · provider auth needed · stablyai/orca',
+      title:
+        'GitHub · Host: devbox · Availability: devbox provider auth needed · Source: stablyai/orca'
+    })
+
+    expect(
+      getTaskSourceAvailabilityNotice({
+        providerLabel: 'GitHub',
+        sourceCount: 3,
+        hostAvailability: [
+          { hostId: 'ssh:devbox', reason: 'unavailable-source-tool' },
+          { hostId: 'runtime:linux', reason: 'unsupported-provider' }
+        ]
+      })
+    ).toEqual({
+      label: 'Some GitHub source hosts unavailable: 2 source hosts',
+      title:
+        'Reconnect or update devbox source tool unavailable, linux provider unsupported on this host to load this source.',
+      blocking: false
+    })
+  })
 })

src/renderer/src/components/task-source-context-summary.ts

@@ -20,7 +20,12 @@ export type TaskSourceHostAvailability = {
   hostId: ExecutionHostScope
   status?: SshConnectionStatus
   health?: ExecutionHostHealth
-  reason?: 'checking-task-source-capability' | 'missing-task-source-capability'
+  reason?:
+    | 'checking-task-source-capability'
+    | 'missing-task-source-capability'
+    | 'missing-provider-auth'
+    | 'unavailable-source-tool'
+    | 'unsupported-provider'
 }
 
 export function getTaskSourceContextSummary(args: {
@@ -211,6 +216,12 @@ function getAvailabilityStatusLabel(availability: TaskSourceHostAvailability): s
       return 'checking server capabilities'
     case 'missing-task-source-capability':
       return 'server update needed for task sources'
+    case 'missing-provider-auth':
+      return 'provider auth needed'
+    case 'unavailable-source-tool':
+      return 'source tool unavailable'
+    case 'unsupported-provider':
+      return 'provider unsupported on this host'
   }
   if (availability.status) {
     return availability.status === 'connected' ? null : getSshStatusLabel(availability.status)