fix(ssh): narrow prune capability error mapping

src/main/ipc/worktrees.test.ts

@@ -6095,7 +6095,7 @@ describe('registerWorktreeHandlers', () => {
     expect(pruneWorktreesMock).not.toHaveBeenCalled()
   })
 
-  it('fails worktrees:pruneStaleRegistrations clearly when the relay lacks prune support', async () => {
+  it('surfaces the provider error when the relay lacks prune support', async () => {
     const repo = {
       id: 'repo-1',
       path: '/remote/repo',
@@ -6105,15 +6105,16 @@ describe('registerWorktreeHandlers', () => {
       connectionId: 'ssh-1'
     }
     store.getRepos.mockReturnValue([repo])
-    // Why: an already-deployed relay predating git.pruneWorktrees rejects the
-    // RPC with "Method not found"; the error must say what to do instead.
+    const oldRelayError = new Error(
+      'The connected SSH host is running an older Orca relay without worktree prune support. Reconnect to update it, or run `git worktree prune` there.'
+    )
     getSshGitProviderMock.mockReturnValue({
-      pruneWorktrees: vi.fn().mockRejectedValue(new Error('Method not found: git.pruneWorktrees'))
+      pruneWorktrees: vi.fn().mockRejectedValue(oldRelayError)
     })
 
     await expect(
       handlers['worktrees:pruneStaleRegistrations'](null, { repoId: 'repo-1' })
-    ).rejects.toThrow(/older Orca relay/)
+    ).rejects.toBe(oldRelayError)
   })
 
   it('continues shared-host pruning and invalidates stale roots after a host fails', async () => {

src/main/ipc/worktrees.ts

@@ -2050,13 +2050,8 @@ export function registerWorktreeHandlers(
               await pruneWorktrees(repo.path, getLocalProjectWorktreeGitOptions(store, repo))
             }
           } catch (error) {
-            // Why: an already-deployed relay predating git.pruneWorktrees
-            // rejects with "Method not found"; surface what to do instead.
-            firstError ??= /method not found/i.test(error instanceof Error ? error.message : '')
-              ? new Error(
-                  'The connected SSH host is running an older Orca relay without worktree prune support. Reconnect to update it, or run `git worktree prune` there.'
-                )
-              : error
+            // Why: shared project ids can span hosts; attempt every host before surfacing a failure.
+            firstError ??= error
           }
         }
       } finally {

src/main/providers/ssh-git-provider.test.ts

@@ -1268,6 +1268,31 @@ describe('SshGitProvider', () => {
     })
   })
 
+  it('pruneWorktrees sends the narrow prune request', async () => {
+    await provider.pruneWorktrees('/home/user/repo')
+
+    expect(mux.request).toHaveBeenCalledWith('git.pruneWorktrees', {
+      repoPath: '/home/user/repo'
+    })
+  })
+
+  it('pruneWorktrees maps old relays to the reconnect message', async () => {
+    mux.request.mockRejectedValueOnce(
+      Object.assign(new Error('Method not found: git.pruneWorktrees'), { code: -32601 })
+    )
+
+    await expect(provider.pruneWorktrees('/home/user/repo')).rejects.toThrow(
+      'The connected SSH host is running an older Orca relay without worktree prune support. Reconnect to update it, or run `git worktree prune` there.'
+    )
+  })
+
+  it('pruneWorktrees rethrows non-method-not-found errors', async () => {
+    const error = new Error('remote prune failed')
+    mux.request.mockRejectedValueOnce(error)
+
+    await expect(provider.pruneWorktrees('/home/user/repo')).rejects.toBe(error)
+  })
+
   it('worktreeIsClean sends git.worktreeIsClean request', async () => {
     const cleanResult = { clean: false, stdout: '?? scratch.txt\n' }
     mux.request.mockResolvedValue(cleanResult)

src/main/providers/ssh-git-provider.ts

@@ -673,9 +673,19 @@ export class SshGitProvider implements IGitProvider {
   }
 
   async pruneWorktrees(repoPath: string): Promise<void> {
-    await this.runWithDiffDedupeClear(async () => {
-      await this.mux.request('git.pruneWorktrees', { repoPath })
-    })
+    try {
+      await this.runWithDiffDedupeClear(async () => {
+        await this.mux.request('git.pruneWorktrees', { repoPath })
+      })
+    } catch (error) {
+      if (isJsonRpcMethodNotFoundError(error)) {
+        // Why: older relays predate the narrow prune RPC; tell the user how to recover.
+        throw new Error(
+          'The connected SSH host is running an older Orca relay without worktree prune support. Reconnect to update it, or run `git worktree prune` there.'
+        )
+      }
+      throw error
+    }
   }
 
   async worktreeIsClean(