feat: add document pipeline, ReAct agent, and knowledge core services

Document Pipeline (Team A):
- LibrarianService: document storage with filesystem backend, metadata
  persistence, child document hierarchy, collection management
- ChunkingService: recursive character text splitter with configurable
  chunk size/overlap, FlowProcessor pattern
- KnowledgeExtractService: combined relationship + definition extraction
  using prompt service and LLM, emits RDF triples and entity contexts
- KnowledgeCoreService: knowledge core CRUD with streaming export and
  flow-based loading

ReAct Agent (Team B):
- StreamingReActParser: state machine for parsing LLM output into
  Thought/Action/ActionInput/FinalAnswer sections
- Three MVP tools: KnowledgeQuery (GraphRAG), DocumentQuery (DocRAG),
  TriplesQuery with RequestResponse clients
- AgentService FlowProcessor with ReAct loop, tool execution, and
  streaming chunk responses (thought/observation/answer)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ts/package.json

@@ -11,12 +11,18 @@
     "config-svc": "tsx scripts/run-config.ts",
     "llm:claude": "tsx scripts/run-llm-claude.ts",
     "llm:openai": "tsx scripts/run-llm-openai.ts",
-    "test:pipeline": "tsx scripts/test-pipeline.ts"
+    "test:pipeline": "tsx scripts/test-pipeline.ts",
+    "agent": "tsx scripts/run-agent.ts",
+    "librarian": "tsx scripts/run-librarian.ts",
+    "knowledge": "tsx scripts/run-knowledge.ts"
   },
   "devDependencies": {
     "tsx": "^4.21.0",
     "turbo": "^2.5.0",
     "typescript": "^5.8.0"
   },
-  "packageManager": "pnpm@9.15.0"
+  "packageManager": "pnpm@9.15.0",
+  "workspaces": [
+    "packages/*"
+  ]
 }