AgentHTTPD v0.2.0

v0.2.0

SPA history-mode fallback — new spa config flag: a static 404 on GET + Accept: text/html serves docroot/index.html, so history-routed front-ends survive deep refresh. API 404s and non-HTML requests are unchanged.

Security fix — the /" entry in the public-path list no longer makes every path public (boundary check now uses the decoded path length, and accepts a trailing ?).

Agent — calc tool exposes pi/e as named constants and function calls.

Commits: 42a176f 7ee9081 f57d1db