ActualProfile.fetch_models() overrides ProviderProfile's default
implementation with its own Actual-specific base_url resolution
(ACTUAL_BASE_URL env var, hosted-vs-local normalization), but called raw
urllib.request.urlopen(req, timeout=timeout) directly instead of the base
class's open_credentialed_url(). Every other provider either uses the
base class default or forwards to it via super() and gets
SafeCredentialRedirectHandler for free — Actual is the only provider that
attaches a Bearer token to its own Request object and opens it with the
stdlib's default redirect handling, which forwards every header,
including Authorization, across a cross-origin redirect.
Actual's own feature surface makes the trigger realistic: ACTUAL_BASE_URL
is a first-class, documented way to point this provider at a self-hosted
or local-offline endpoint (see the local-loopback no-auth path already
handled elsewhere in this provider), so a misconfigured or compromised
endpoint 302-ing to another host leaks ACTUAL_API_KEY to it.
Fix: import and call the same open_credentialed_url() the base class
uses, keeping Actual's own URL-resolution logic unchanged.
Adds an end-to-end regression test using two real local HTTP servers (no
mocking of the security module itself) — one redirects, the other
records the Authorization header it receives — mirroring
test_urllib_security.py's own redirect tests. Also repoints the existing
fetch_models test's mock from urllib.request.urlopen to
hermes_cli.urllib_security.open_credentialed_url, since fetch_models no
longer calls the former. Mutation-verified: the new redirect test fails
on pre-fix code with the Authorization header observed at the redirect
target.
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