feat(go): add Phase 1 parity sidecar

docs/SURICATA_ASSIMILATION.md

@@ -226,7 +226,10 @@ signature keeps `sid` / `signature` / `classtype` / tests / docs.
   as event types). This is the Python↔Go contract. *No language change yet.*
 - **Phase 1 — Go agent skeleton.** Config, daemon sweep loop, `SystemState`
   equivalent, poll detectors ported, JSON output matching schemas. Runs
-  alongside Python; harness compares both.
+  alongside Python; harness compares both. *In progress:* the isolated
+  `go-agent/` sidecar now has stdlib config loading, an injectable `/proc`
+  process view, the JSONL sweep loop, and fixture parity for `deleted_exe`;
+  Python remains the production agent.
 - **Phase 2 — eBPF via `cilium/ebpf`.** Port exec/syscall rules; drop the
   bcc/Python runtime dependency; single static binary.
 - **Phase 3 — Rule-engine parity + assimilation.** `rev`/`reference`/`metadata`,