docs: comprehensive AWS Bedrock documentation update (#283)

* docs: update AWS Bedrock documentation with comprehensive coverage

- Add Quick Start section to aws-bedrock.md for running a full Bedrock instance
- Document bedrock/ prefix requirement for embedding models vs no prefix for generation
- Add installation instructions for the [aws] extra (boto3, botocore)
- Fix Docker Compose instructions to use --profile aws instead of DOCKER_TARGET
- Fix region env var references (REGION_NAME + AWS_REGION_NAME)
- Add latest Anthropic Claude models (Opus 4.6, Sonnet 4.6, Opus 4.1, Sonnet 4, etc.)
- Add additional embedding models (Titan multimodal, Cohere Embed v4)
- Fix default GENERATION_MODEL in llm-providers.md to match config.py
- Add hybrid config examples (Bedrock embeddings + OpenAI generation and vice versa)
- Add troubleshooting entries for missing AWS dependencies
- Cross-reference between aws-bedrock.md and llm-providers.md

* fix: update stale docstring in langchain integration to use create_agent

The module docstring was using the removed create_tool_calling_agent and
AgentExecutor API from LangChain < v0.2. Updated to use create_agent
from langchain.agents, which is the current API.

* docs: address PR review feedback from Copilot

- Fix REGION_NAME vs AWS_REGION_NAME: clarify AWS_REGION_NAME is required
  (LiteLLM), REGION_NAME is optional (server-side boto3 model-existence checks)
- Fix IAM role section: note that server boto3 utilities currently require
  explicit credentials, but LiteLLM handles IAM roles natively
- Fix REDISVL_VECTOR_DIMENSIONS description: it is a fallback/override, not
  auto-detected
- Add asterisk notes on embedding models not in MODEL_CONFIGS (titan-embed-image,
  cohere.embed-v4) requiring explicit REDISVL_VECTOR_DIMENSIONS

* docs: address reviewer feedback

- Clarify bedrock/ prefix is optional (not prohibited) for generation models
- Remove boto3/botocore version ranges from docs
- Rename LLM Proxy to LLM Proxy (LiteLLM) in architecture diagram
- Update wording from 'no prefix needed' to 'prefix optional'

Author: nkanu17

agent-memory-client/agent_memory_client/integrations/langchain.py

@@ -8,9 +8,8 @@
     ```python
     from agent_memory_client import create_memory_client
     from agent_memory_client.integrations.langchain import get_memory_tools
-    from langchain.agents import create_tool_calling_agent, AgentExecutor
+    from langchain.agents import create_agent
     from langchain_openai import ChatOpenAI
-    from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 
     # Initialize memory client
     memory_client = await create_memory_client("http://localhost:8000")
@@ -24,16 +23,15 @@
 
     # Use with LangChain agent
     llm = ChatOpenAI(model="gpt-4o")
-    prompt = ChatPromptTemplate.from_messages([
-        ("system", "You are a helpful assistant with memory."),
-        ("human", "{input}"),
-        MessagesPlaceholder("agent_scratchpad"),
-    ])
-    agent = create_tool_calling_agent(llm, tools, prompt)
-    executor = AgentExecutor(agent=agent, tools=tools)
+    agent = create_agent(
+        llm, tools,
+        system_prompt="You are a helpful assistant with memory."
+    )
 
     # Run the agent
-    result = await executor.ainvoke({"input": "Remember that I love pizza"})
+    result = await agent.ainvoke(
+        {"messages": [("human", "Remember that I love pizza")]}
+    )
     ```
 """