docs: salvage focused stale PR contributions

- add Vite and Redis pattern skills from closed stale PRs

- add frontend-slides support assets

- port skill-comply runner fixes and LLM prompt/provider regressions

- harden agent frontmatter validation and sync catalog counts

src/llm/prompt/__init__.py

@@ -1,13 +1,23 @@
 """Prompt module for prompt building and normalization."""
 
 from llm.prompt.builder import PromptBuilder, adapt_messages_for_provider, get_provider_builder
-from llm.prompt.templates import TEMPLATES, get_template, get_template_or_default
+from llm.prompt.templates import (
+    TEMPLATES,
+    clear_templates,
+    deregister_template,
+    get_template,
+    get_template_or_default,
+    register_template,
+)
 
 __all__ = (
     "PromptBuilder",
     "TEMPLATES",
+    "clear_templates",
+    "deregister_template",
     "adapt_messages_for_provider",
     "get_provider_builder",
     "get_template",
     "get_template_or_default",
+    "register_template",
 )