Audit fix H2 (+ M2): the live GravityZone tenant is rate-limited and sweeps fan
out one getManagedEndpointDetails per endpoint across every company, which hit a
real HTTP 429 (errorlog 2026-06-21). _post had zero retry and opened a fresh
httpx.Client (new TLS handshake) per request.
- _post now retries 429/500/502/503/504/timeout up to RETRY_MAX_ATTEMPTS with
bounded exponential backoff + jitter, honoring Retry-After (numeric or HTTP-date).
Retry notices go to stderr (don't pollute --json). Terminal errors still raise.
- M2: a single httpx.Client is created lazily and reused (connection pooling),
closed via client.close() in main()'s finally. Makes the docstring's pooling
claim true and cuts handshake overhead + 429 pressure during sweeps.
- Verified: compile clean; offline unit tests (persistent 429 -> 4 attempts then
raise, flaky 503 -> recovers, Retry-After honored); live status read OK.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Howard Enos
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