feat: add DeepSeek and NVIDIA NIM providers

- Add deepseek and nvidia entries to gateway-provider config

- Add DEEPSEEK_API_KEY and NVIDIA_API_KEY to .env.example

- Add deepseek and nvidia to doctor's LLM provider check

- Fix remaining harness-log → log-message reference

org/system-actuator-shell.org

@@ -0,0 +1,51 @@
+#+TITLE: SKILL: Shell Actuator (org-skill-shell-actuator.org)
+#+AUTHOR: Agent
+#+FILETAGS: :skill:actuator:shell:
+#+PROPERTY: header-args:lisp :tangle ../lisp/system-actuator-shell.lisp
+
+* Overview: The Physical Actuator
+
+The Shell Actuator is the agent's hand in the physical world. Given a shell command, it executes it via ~bash -c~ and returns the output. This is how the agent installs packages, reads files, runs scripts, and interacts with any Unix tool.
+
+Because shell execution is the highest-risk operation in the system, the Shell Actuator is protected by multiple safety layers:
+1. The Bouncer's shell safety gate blocks destructive commands (~rm -rf /~, ~dd~, ~mkfs~)
+2. The Bouncer's injection gate blocks backtick and ~$()~ patterns
+3. The Bouncer's network exfil gate blocks connections to unwhitelisted hosts
+4. The actuator enforces a timeout (default 30s) so hanging commands don't freeze the agent
+5. The actuator caps output (default 100KB) so infinite output doesn't exhaust memory
+
+* Implementation
+
+** Shell Execution (actuator-shell-execute)
+#+begin_src lisp
+(defun actuator-shell-execute (action context)
+  "Executes a bash command with timeout (via timeout(1)) and output limit."
+  (declare (ignore context))
+  (let* ((payload (getf action :payload))
+         (cmd (getf payload :cmd))
+         (timeout-sym (find-symbol "*BOUNCER-SHELL-TIMEOUT*" :passepartout))
+         (timeout (or (getf payload :timeout) (if timeout-sym (symbol-value timeout-sym) 30)))
+         (max-sym (find-symbol "*BOUNCER-SHELL-MAX-OUTPUT*" :passepartout))
+         (max-output (or (getf payload :max-output) (if max-sym (symbol-value max-sym) 100000)))
+         (wrapped-cmd (format nil "timeout ~a bash -c ~s" timeout cmd)))
+    (harness-log "ACT [Shell]: ~a (timeout: ~as)" cmd timeout)
+    (multiple-value-bind (out err code)
+        (uiop:run-program (list "bash" "-c" wrapped-cmd)
+                          :output :string :error-output :string
+                          :ignore-error-status t)
+      (cond
+        ((= code 124) (format nil "ERROR: Command timed out after ~a seconds" timeout))
+        ((> (length out) max-output)
+         (format nil "~a~%... (output truncated to ~a chars)" (subseq out 0 max-output) max-output))
+        ((= code 0) out)
+        (t (format nil "ERROR [~a]: ~a" code err))))))
+#+end_src
+
+** Skill Registration
+#+begin_src lisp
+(register-actuator :shell #'actuator-shell-execute)
+
+(defskill :passepartout-system-actuator-shell
+  :priority 50
+  :trigger (lambda (ctx) (declare (ignore ctx)) nil))
+#+end_src