feat(tests): GAP-05 add _get_with_retry() with 429 back-off + fix broken test_call_peer_errors
Adds retry-on-429 with exponential back-off (1 s → 2 s → 4 s, ±25% jitter,
30 s cap, Retry-After header honoured) to all idempotent RemoteAgentClient
GET calls: poll_state, pull_secrets, get_peers, discover_peer.
Also fixes the merged test_call_peer_errors.py (PR #7) which was broken:
- Removed pytest-mock dependency (mocker not installed)
- Fixed call_peer(message: str) vs dict
- Fixed non-existent _call_direct/_call_proxy method patches
- Uses FakeResponse + _session.post.side_effect pattern consistently
Adds tests/conftest.py (FakeResponse + client fixture + _CaptureHandler)
and tests/test_retry_backoff.py (18 new tests).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Molecule AI SDK-Dev
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