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-archivist.org

@@ -0,0 +1,26 @@
+#+TITLE: SKILL: Scribe (org-skill-scribe.org)
+#+AUTHOR: Agent
+#+FILETAGS: :skill:scribe:documentation:
+#+PROPERTY: header-args:lisp :tangle ../lisp/system-archivist.lisp
+
+* Overview
+The *Scribe Skill* manages the agent's internal documentation and logs.
+
+* Implementation
+
+** Documentation Logic
+#+begin_src lisp
+(defun archivist-log (signal)
+  "Logs a metabolic signal for later analysis."
+  (let ((type (getf signal :type))
+        (payload (getf signal :payload)))
+    (harness-log "SCRIBE: [~a] ~s" type payload)))
+#+end_src
+
+** Skill Registration
+#+begin_src lisp
+(defskill :passepartout-system-archivist
+  :priority 100
+  :trigger (lambda (ctx) (member (getf ctx :type) '(:LOG :STATUS)))
+  :deterministic (lambda (action ctx) (declare (ignore action)) (archivist-log ctx) nil))
+#+end_src