v3.5.1: infra/host engagements — IP + SSH/Windows-AD creds + Linux/Win/AD agents + REPL context bar

Infra:
- creds.yaml gains `ssh:` (host/port/user/password/key) and `windows:`/`ad:`
  (host/user/password/domain/ntlm-hash) blocks; multi-block YAML parser.
  host_instruction() tells agents how to authenticate to the host.
- 14 infra agents (agents_md/infra/): port/service scan, SMB enum, Linux privesc/
  sudo/cron/SSH, Windows privesc/SMB-signing/WinRM, AD kerberoast/asreproast/ACL/
  DCSync/default-creds. Loader gains `infra` category → 317 agents total.
- run_host pipeline + `neurosploit host <ip> --creds creds.yaml` (and Mode::Host
  in run_mode/TUI): host recon (nmap/netexec) → infra agent selection → test →
  validate → chain → report, with host tooling doctrine + supplied creds.

REPL:
- Context/status bar above the prompt: "model auth · cwd · mode▸target"
  (e.g. claude-opus-4-8 sub · /opt/projeto · black-box▸app.acme.com).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neurosploit-rs/creds.example.yaml

@@ -20,3 +20,18 @@ login:
   username: admin
   password: password
   success: Logout        # text that appears on a successful login
+
+# --- infra/host credentials (used by `neurosploit host <ip> --creds creds.yaml`) ---
+ssh:
+  host: 10.0.0.5
+  port: 22
+  user: ubuntu
+  password: s3cret        # or:
+  key: /home/op/id_ed25519
+
+windows:                  # also used for Active Directory
+  host: 10.0.0.10
+  domain: CORP
+  user: jdoe
+  password: Winter2026!   # or pass-the-hash:
+  hash: aad3b435b51404eeaad3b435b51404ee:NThashhere