docs(claude+readme): standardize CLAUDE.md, sync loader API method count 6 → 7

- CLAUDE.md: drop Karpathy block, list all 7 loader methods incl
  register_audio_attachment_processor
- README: extend "Public extension API" to 7 methods

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -35,15 +35,16 @@ Without `HERMES_WEBUI_PYTHON_PLUGIN`, hermes-webui runs vanilla (no Svrnty mods)
 
 ## Public extension API
 
-The plugin loader (one fork commit in hermes-webui) exposes exactly 6 methods:
+The plugin loader (one fork commit in hermes-webui) exposes exactly 7 methods:
 
 ```python
-api.register_route(path, method, handler)   # add /api/<path>
-api.register_static(prefix, directory)      # serve files under /plugins/<prefix>/...
-api.inject_script(url)                      # add <script> to index.html
-api.inject_stylesheet(url)                  # add <link> to index.html
-api.config_get(key, default)                # safe upstream config read
-api.logger(name)                            # namespaced logger
+api.register_route(path, method, handler)         # add /api/<path>
+api.register_static(prefix, directory)            # serve files under /plugins/<prefix>/...
+api.inject_script(url)                            # add <script> to index.html
+api.inject_stylesheet(url)                        # add <link> to index.html
+api.config_get(key, default)                      # safe upstream config read
+api.logger(name)                                  # namespaced logger
+api.register_audio_attachment_processor(fn)       # hook STT/voice attachment pipeline
 ```
 
 Touching anything else in hermes-webui = a Rule 2 violation per the protocol. Document the escape hatch in `CONNECTION-MAP.md` under "forced internal dependencies".