Extend the fake Nexus/Praxis/Hexis harness with request header and query
capture, a malformed-body lever, a response delay lever, and a request
counter, then add a degraded-mode suite on top of it: independent outages,
malformed and drifted contracts, cancellation, execution failure vs
transport failure, ambiguous targets, no autonomous Praxis to Hexis
chaining, confirmation for mutating capabilities, and recovery without a
restart.
Adds fakeecosystem_test.go: a shared fakeServer wrapping httptest.Server
with request capture, a runtime-toggleable fault (SetFault) that makes a
running fake Nexus/Praxis/Hexis fail closed like a real outage without
tearing the server down, protocol fixtures for each service's documented
response shapes, and a settable fakeClock for time-dependent assertions.
Uses it in ecosystem_harness_test.go to cover a gap the existing ad-hoc
per-test httptest servers didn't reach — handlePraxisAct had zero test
coverage — plus a fault-then-recovery test showing the same fake flapping
mid-session, the shape the earlier fail-closed fixes (#272/#273) need
regression coverage against.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018ghELqYhZNLub2TXGMazqA
kami