feat: full steel-memory integration

Expand steel_memory.rs to use all steel-memory features:

## Vector Search (existing)
- Semantic search over memories
- Add/index memories to palace
- Workspace indexing (MEMORY.md, memory/*.md)

## Knowledge Graph (new)
- kg_add() — add temporal RDF triples (subject-predicate-object)
- kg_invalidate() — soft-delete triples
- kg_query() — query by entity (outgoing/incoming/both)
- kg_timeline() — chronological triples for an entity
- kg_stats() — entity/triple counts

## Palace Graph (new)
- palace_graph() — build room/wing graph with drawer counts
- palace_traverse() — BFS traversal from a starting room
- palace_tunnels() — find rooms that exist in multiple wings
- palace_stats() — wings/rooms/tunnels statistics

## AAAK Dialect (new)
- compress_aaak() — compress memory to efficient dialect format
- wake_up() — generate AAAK-compressed context for priming

## Agent Diary (new)
- diary_write() — write timestamped journal entries
- diary_read() — read entries filtered by agent

Also:
- Rename SteelMemoryIndex → SteelMemory (with type alias for compat)
- Add comprehensive tests for all new features
- Update steel-memory dependency to use main branch (0.1.2+)

Requires steel-memory commit c3fdcf4 which exports KnowledgeGraph,
PalaceGraph, RoomNode, Entity, and Triple types.

Author: rexlunae

crates/rustyclaw-core/Cargo.toml

@@ -94,7 +94,7 @@ schemars = { workspace = true, optional = true }
 
 # Steel Memory - semantic vector search memory palace
 # Using git until 0.1.1 is published (rusqlite 0.37 for diesel compatibility)
-steel-memory = { git = "https://github.com/rexlunae/steel-memory", optional = true }
+steel-memory = { git = "https://github.com/rexlunae/steel-memory", branch = "main", optional = true }
 
 # SSH transport (optional)
 russh = { version = "0.52", features = ["async-trait"], optional = true }