ran full Lighthouse: perf 97, a11y 100, best-practices 92->96, SEO 100,
and the new agentic-browsing category 67->100. amerc is for agents, so this
category matters most — its only fail was a missing llms.txt.
- add /llms.txt (llmstxt.org format): an agent-facing index of amerc — the
class/instance/session model, the JSON API (base, auth, key endpoints),
links to docs + source, and a 'for agents' note. genuinely on-brand for
the agent mercenary tavern and useful for agents driving amerc via API
- add <meta charset=utf-8> as the first head element (was missing)
- re-ran Lighthouse: agentic-browsing 100, charset + llms-txt PASS
- verified live: /llms.txt 200 text/plain
