fix(server): deduplicate workspaces by git worktree root (#190)

* fix(server): deduplicate workspaces by resolving to git worktree root

Agents running in subdirectories of the same git repo were creating
separate workspace entries in the sidebar. Now workspace IDs resolve
to the git worktree root (via the already-computed `worktreeRoot` from
`inspectCheckoutContext`), so all agents in the same checkout share a
single workspace. Stale subdirectory workspace records are archived
during reconciliation.

* fix(server): fix 3 broken test files in server unit suite

- relay-reconnect: move speech mock to correct constructor position and
  rename getSpeechReadiness→getReadiness after SpeechService refactor
- commands-poc: add credential/CLI availability guards matching
  claude-agent.integration.test.ts pattern
- claude-sdk-behavior: pass pathToClaudeCodeExecutable via findExecutable
  and add credential guards matching real provider configuration

* fix(server): fix race condition in loop-service test mock

Replace setTimeout(..., 0) with queueMicrotask() in ScriptedAgentSession
so turn_completed events fire before the verify check runs. Fixes flaky
CI failure where the file write hadn't completed before verification.

* fix(server): use /bin/sh for loop verify checks instead of /bin/zsh

More portable across CI environments. Also use queueMicrotask in test
mock to fix race condition between event emission and waiter setup.

* fix(server): correct import paths for isCommandAvailable and findExecutable

Import from utils/executable.js (where they're exported) instead of
provider-launch-config.js (which only imports them internally).

packages/server/src/poc-commands/commands-poc.test.ts

@@ -15,13 +15,16 @@
  * This pattern is used in claude-agent.ts listModels().
  */
 
-import { describe, it, expect } from "vitest";
+import { describe, expect, test } from "vitest";
 import {
   query,
-  type Query,
-  type SlashCommand,
   type SDKUserMessage,
 } from "@anthropic-ai/claude-agent-sdk";
+import { isCommandAvailable } from "../utils/executable.js";
+
+const hasClaudeCredentials =
+  !!process.env.CLAUDE_CODE_OAUTH_TOKEN || !!process.env.ANTHROPIC_API_KEY;
+const canRunClaudeIntegration = isCommandAvailable("claude") && hasClaudeCredentials;
 
 // Pattern from claude-agent.ts listModels():
 // Use an empty async generator when you just need control methods
@@ -31,7 +34,7 @@ function createEmptyPrompt(): AsyncGenerator<SDKUserMessage, void, undefined> {
 
 describe("Claude Agent SDK Commands POC", () => {
   describe("supportedCommands() API", () => {
-    it("should return an array of SlashCommand objects", async () => {
+    test.runIf(canRunClaudeIntegration)("should return an array of SlashCommand objects", async () => {
       // Use the pattern from claude-agent.ts:
       // Create a query with empty prompt generator for control methods
       const emptyPrompt = createEmptyPrompt();
@@ -72,7 +75,7 @@ describe("Claude Agent SDK Commands POC", () => {
       }
     }, 30000);
 
-    it("should have valid SlashCommand structure for all commands", async () => {
+    test.runIf(canRunClaudeIntegration)("should have valid SlashCommand structure for all commands", async () => {
       const emptyPrompt = createEmptyPrompt();
 
       const claudeQuery = query({
@@ -107,7 +110,7 @@ describe("Claude Agent SDK Commands POC", () => {
   });
 
   describe("Command Execution", () => {
-    it("should explain that commands are prompts with / prefix", () => {
+    test("should explain that commands are prompts with / prefix", () => {
       // This is a documentation test - commands ARE just prompts with / prefix
       // To execute a command:
       // 1. Create a user message with content: "/{commandName}"