A2A_PORT and A2A_ADVERTISED_TOOLSETS are already captured at
construction time (inside _profile_runtime_scope) via
_get_scoped_secret(), but A2A_PUBLIC_URL was still read with a bare
os.getenv() inside A2ARequestHandler._request_public_url() - which
runs on ThreadingHTTPServer's per-connection OS thread, not the
constructing thread.
Raw threading.Thread never inherits contextvars, so even swapping the
reader to _get_scoped_secret() at that call site would not help: the
request thread has no scope, secret_scope falls back to os.environ
either way. The value must be captured once at construction time
(which does run in profile scope) and threaded through as instance
state instead - same fix shape as A2A_PORT above.
A secondary multiplex profile without its own A2A_PUBLIC_URL now
falls back to the X-Forwarded-Host/Host-derived URL (or the bind
host) instead of silently advertising the default profile's public
URL in its Agent Card / discovery response.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
(cherry picked from commit 0c36aca5de53d88bbbc0b4cfceaed8307c744f7a)
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