fix: use 'initializing' as preflight phase label

'identifying prerequisites' is just initializing — no need for a
separate label. Reverts the test regex back to the original set.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: aid-ninja

site/index.html

@@ -1564,7 +1564,7 @@
       // Pass 0: Pre-flight prerequisite extraction (~5s)
       // Ask the LLM a simple direct question to surface implicit prerequisites
       // that it cannot identify inside complex research prompts
-      setPhase('identifying prerequisites...', 'research');
+      setPhase('initializing...', 'research');
       try {
         var preflightSys = 'Extract the key object from this question. Complete this sentence in 1-3 words: "To accomplish the task in this question, the ___ must be present." If no specific physical object is needed, respond with just the word "nothing".';
         var preflightText = await streamPassWithRetry(preflightSys, question, signal);

test/site.e2e.js

@@ -154,7 +154,7 @@ test.describe("sprint flow", () => {
 		const label = page.locator(".sprint-phase-label");
 		await expect(label).toBeVisible({ timeout: 5000 });
 		await expect(label).toContainText(
-			/researching|challenging|synthesizing|compiling|initializing|identifying prerequisites/i,
+			/researching|challenging|synthesizing|compiling|initializing/i,
 		);
 	});