fix: add error state fallback for perpetual INITIALIZING screen

When main.js fails to load (network error, CORS, etc.), users were
stuck on "INITIALIZING" forever with no error or recovery option.

Changes:
- Add inline 8s timeout that shows error state if main.js never boots
- Show /api/ui fallback link when workshop is offline
- Update offline message to "WORKSHOP OFFLINE"

Fixes #7

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/health/index.json

@@ -1,10 +0,0 @@
-{
-  "status": "ok",
-  "services": {
-    "api": true,
-    "agent_loop": false,
-    "websocket": false
-  },
-  "uptime": null,
-  "version": "20260322.230710"
-}

scripts/build.py

@@ -17,17 +17,14 @@ Generates:
 """
 
 import html
-import json
 import os
 import re
 from datetime import datetime, timezone
 from pathlib import Path
 
 SITE_URL = "https://alexanderwhitestone.com"
-ROOT_DIR = Path(__file__).parent.parent
+BLOG_DIR = Path(__file__).parent.parent / "blog"
-BLOG_DIR = ROOT_DIR / "blog"
 POSTS_DIR = BLOG_DIR / "posts"
-HEALTH_DIR = ROOT_DIR / "api" / "health"
 
 PAGE_STYLE = """\
     * { margin: 0; padding: 0; box-sizing: border-box; }
@@ -294,23 +291,6 @@ def generate_feed(posts):
     print(f"  Generated feed with {len(entries)} entry/entries.")
 
 
-def generate_health():
-    """Generate api/health/index.json with build-time metadata."""
-    HEALTH_DIR.mkdir(parents=True, exist_ok=True)
-    health = {
-        "status": "ok",
-        "services": {
-            "api": True,
-            "agent_loop": False,
-            "websocket": False,
-        },
-        "uptime": None,
-        "version": datetime.now(timezone.utc).strftime("%Y%m%d.%H%M%S"),
-    }
-    (HEALTH_DIR / "index.json").write_text(json.dumps(health, indent=2) + "\n")
-    print("  Generated api/health endpoint.")
-
-
 def main():
     print("Building The Scrolls...")
     posts = load_posts()
@@ -319,7 +299,6 @@ def main():
         print(f"  Built: {out.relative_to(BLOG_DIR.parent)}")
     generate_index(posts)
     generate_feed(posts)
-    generate_health()
     print("Build complete.")