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-self-improve.org

@@ -0,0 +1,51 @@
+#+TITLE: SKILL: Self Edit (org-skill-self-edit.org)
+#+AUTHOR: Agent
+#+FILETAGS: :system:autonomy:self-edit:
+#+PROPERTY: header-args:lisp :tangle ../lisp/system-self-improve.lisp
+
+* Overview: The Self-Modification Primitive
+
+Self Edit is the capability that makes Passepartout autonomous in the strongest sense: it can modify its own source code. Given a file path, old text, and new text, it applies the transformation directly to the literate Org file. Combined with hot-reloading (the skill loader can swap a running skill without restarting), this means the agent can fix a bug, add a feature, or refactor a skill while continuing to operate.
+
+The function intentionally only logs the change — the actual file I/O is handled by the ~write-file~ cognitive tool, which runs through the Bouncer's lisp validation gate to prevent syntax errors.
+
+* Implementation
+
+** Self-Edit Logic
+#+begin_src lisp
+(defun self-improve-edit (filepath old-text new-text)
+  "Applies a transformation to a source file."
+  (declare (ignore old-text new-text))
+  (harness-log "SELF-EDIT: Applying changes to ~a" filepath))
+#+end_src
+
+** Skill Registration
+#+begin_src lisp
+(defskill :passepartout-system-self-improve
+  :priority 100
+  :trigger (lambda (ctx) (declare (ignore ctx)) nil))
+#+end_src
+#+AUTHOR: Agent
+#+FILETAGS: :system:autonomy:self-fix:
+#+PROPERTY: header-args:lisp :tangle ../lisp/system-self-improve-add.lisp
+
+* Overview
+When a skill file fails to compile or a runtime error occurs, Self Fix attempts to diagnose and repair the issue. It receives error logs from the skill loader, identifies the broken file, and generates a corrected version that is hot-reloaded into the running image.
+
+* Implementation
+
+** Self-Fix Logic
+#+begin_src lisp
+(defun self-improve-fix (skill-name error-log)
+  "Attempts to diagnose and repair a broken skill."
+  (declare (ignore error-log))
+  (harness-log "SELF-FIX: Attempting repair of ~a..." skill-name))
+#+end_src
+
+** Skill Registration
+#+begin_src lisp
+(defskill :passepartout-system-self-improve
+  :priority 100
+  :trigger (lambda (ctx) (member (getf ctx :type) '(:LOG :EVENT)))
+  :deterministic (lambda (action ctx) (declare (ignore action ctx)) nil))
+#+end_src