Wire agents to trust the gateway's self-signed leaf at build time. When
the gateway runs self-signed TLS, hive-tls sets HIVE_TLS_CA_PATH in
hive-c0re's service env pointing at the host hive CA cert. The meta flake
renderer reads it and, when present, writes the public CA cert next to
flake.nix as hive-ca.pem and emits security.pki.certificateFiles so every
agent's system trust store includes the hive CA.
Build-time embedding (rather than a runtime bind-mount + bundle service)
keeps trust robust: the CA travels with the flake source, lands in the
standard NixOS trust store, and needs no per-process SSL_CERT_FILE
plumbing. Only the public CA certificate is embedded; the CA private key
never leaves the host. The cert is re-embedded and re-committed on CA
rotation even when the flake is otherwise byte-identical; when self-signed
TLS is off the embedded cert is dropped so the flake stays buildable.
Covers OpenSSL-based tools (git, curl) directly. A follow-up switches the
hive-forge reqwest client to native roots so it picks up the same store.
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