linux observer

complete the embedded s/pl cutover master

- remove legacy config URL/key/chat authority and identity writers, chat_bridge.rs, the ServerUrl D-Bus property, the public-site Open Journal fallback, and reqwest's rustls-tls feature - add no-exemption closed-inventory source policy and structural docs policy sharing one legacy-vocabulary authority - establish eleven-state link-health precedence with process-epoch invalidation and a read-only daemon-liveness probe - add the opaque epoch-bound Open Journal capability - add deterministic real-format package auditing with a bounded ELF64 reader