s_fetch_page
Fetches a complete web page with pagination support. Retrieves content from websites with bot-detection avoidance. For best performance, start with 'basic' mode (fastest), then only escalate to 'stealth' or 'max-stealth' modes if basic mode fails. Content is returned as 'METADATA: {json}\n\n[content]' where metadata includes length information and truncation status.
Args:
url: URL to fetch
mode: Fetching mode (basic, stealth, or max-stealth)
format: Output format (html or markdown)
max_length: Maximum number of characters to return.
start_index: On return output starting at this character index, useful if a previous fetch was truncated and more content is required.