fix: improve Steward delegation instructions for Librarian

- Update Librarian capability description to highlight CREATE/UPDATE/SEARCH
- Add specific Steward guidelines for wiki creation, updates, and research
- Add dynamic time injection to user prompts for temporal awareness
- Expand domains to include 'create', 'write', 'update'
- Update test to match new capability description

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/agents/librarian/capability.py

@@ -21,8 +21,10 @@ LIBRARIAN_CAPABILITY = HouseholdCapability(
     role="The Librarian",
     category="research",
     description=(
-        "Research assistant providing knowledge search, wiki access, "
-        "semantic search, and knowledge graph exploration via library-desk API"
+        "Research and wiki management: can CREATE wiki pages about topics "
+        "(with automatic HybridRAG research), UPDATE existing pages, "
+        "SEARCH wiki/knowledge graph/web, and synthesize information. "
+        "Use for: 'create a page about X', 'update wiki', 'find info on X'"
     ),
     domains=[
         "research",
@@ -32,6 +34,9 @@ LIBRARIAN_CAPABILITY = HouseholdCapability(
         "documents",
         "search",
         "synthesis",
+        "create",
+        "write",
+        "update",
     ],
     cost="medium",  # Multiple API calls to library-desk
     requires_network=True,  # Needs library-desk API access