docs: update all chunk flag names to match renamed CLI flags

Replace all occurrences of old ambiguous flag names with the new explicit ones:
  --chunk-size (tokens)  → --chunk-tokens
  --chunk-overlap        → --chunk-overlap-tokens
  --chunk                → --chunk-for-rag
  --streaming-chunk-size → --streaming-chunk-chars
  --streaming-overlap    → --streaming-overlap-chars
  --chunk-size (pages)   → --pdf-pages-per-chunk

Updated: CLI_REFERENCE (EN+ZH), user-guide (EN+ZH), integrations (Haystack,
Chroma, Weaviate, FAISS, Qdrant), features/PDF_CHUNKING, examples/haystack-pipeline,
strategy docs, archive docs, and CHANGELOG.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/integrations/CHROMA.md

@@ -223,7 +223,7 @@ skill-seekers package output/codebase --target langchain
 
 **Option D: RAG-Optimized Chunking**
 ```bash
-skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
 skill-seekers package output/fastapi --target langchain
 ```
 
@@ -968,7 +968,7 @@ collection.add(
 
 2. **Implement Semantic Chunking:**
    ```bash
-   skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+   skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
    ```
 
 3. **Set Up Multi-Collection Search:**

docs/integrations/FAISS.md

@@ -255,7 +255,7 @@ skill-seekers package output/codebase --target langchain
 
 **Option D: RAG-Optimized Chunking**
 ```bash
-skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
 skill-seekers package output/fastapi --target langchain
 ```
 

docs/integrations/HAYSTACK.md

@@ -318,8 +318,8 @@ print(response["llm"]["replies"][0])
 # Enable semantic chunking (preserves code blocks, respects paragraphs)
 skill-seekers scrape --config configs/django.json \
   --chunk-for-rag \
-  --chunk-size 512 \
-  --chunk-overlap 50
+  --chunk-tokens 512 \
+  --chunk-overlap-tokens 50
 
 # Package chunked output
 skill-seekers package output/django --target haystack
@@ -439,8 +439,8 @@ python scripts/merge_documents.py \
 # Enable chunking for frameworks with long pages
 skill-seekers scrape --config configs/django.json \
   --chunk-for-rag \
-  --chunk-size 512 \
-  --chunk-overlap 50
+  --chunk-tokens 512 \
+  --chunk-overlap-tokens 50
 ```
 
 ### 2. Choose Right Document Store
@@ -506,8 +506,8 @@ Complete example of building a FastAPI documentation chatbot:
 # Scrape FastAPI docs with chunking
 skill-seekers scrape --config configs/fastapi.json \
   --chunk-for-rag \
-  --chunk-size 512 \
-  --chunk-overlap 50 \
+  --chunk-tokens 512 \
+  --chunk-overlap-tokens 50 \
   --max-pages 200
 
 # Package for Haystack
@@ -698,8 +698,8 @@ skill-seekers scrape --config configs/fastapi.json --chunk-for-rag
 # 2. Adjust chunk size
 skill-seekers scrape --config configs/fastapi.json \
   --chunk-for-rag \
-  --chunk-size 768 \  # Larger chunks for more context
-  --chunk-overlap 100  # More overlap for continuity
+  --chunk-tokens 768 \  # Larger chunks for more context
+  --chunk-overlap-tokens 100  # More overlap for continuity
 
 # 3. Use hybrid search (BM25 + embeddings)
 # See Advanced Usage section

docs/integrations/QDRANT.md

@@ -270,7 +270,7 @@ skill-seekers package output/codebase --target langchain
 
 **Option D: RAG-Optimized Chunking**
 ```bash
-skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
 skill-seekers package output/fastapi --target langchain
 ```
 

docs/integrations/WEAVIATE.md

@@ -210,7 +210,7 @@ skill-seekers package output/codebase --target langchain
 
 **Option D: RAG-Optimized Chunking**
 ```bash
-skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
 skill-seekers package output/fastapi --target langchain
 ```
 
@@ -960,7 +960,7 @@ print(schema.get("multiTenancyConfig", {}).get("enabled"))  # Should be True
 
 2. **Implement Semantic Chunking:**
    ```bash
-   skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-size 512
+   skill-seekers scrape --config configs/fastapi.json --chunk-for-rag --chunk-tokens 512
    ```
 
 3. **Set Up Multi-Tenancy:**