anti 0c77cdab32 feat(swarm): master AgentClient — mTLS httpx wrapper around worker API ...

decnet.swarm.client exposes:
- MasterIdentity / ensure_master_identity(): the master's own CA-signed
  client bundle, issued once into ~/.decnet/ca/master/.
- AgentClient: async-context httpx wrapper that talks to a worker agent
  over mTLS. health/status/deploy/teardown methods mirror the agent API.

SSL context is built from a bare ssl.SSLContext(PROTOCOL_TLS_CLIENT)
instead of httpx.create_ssl_context — the latter layers on default-CA
and purpose logic that broke private-CA mTLS. Server cert is pinned by
CA + chain, not DNS (workers enroll with arbitrary SANs).

tests/swarm/test_client_agent_roundtrip.py spins uvicorn in-process
with real certs on disk and verifies:
- A CA-signed master client passes health + status calls.
- An impostor whose cert comes from a different CA cannot connect.

2026-04-18 19:08:36 -04:00

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