feat: add hybrid workspace context provider with RAG and MCP server

[VenkateshBuddhi]

Summary

This PR adds a new community agent, Autonomous Workspace Context Provider, under contributors/workspace-context-provider/.

The agent continuously indexes a local workspace using Watchdog, generates embeddings with Sentence Transformers, stores them in ChromaDB, and exposes the indexed context through:

• A Streamlit-based RAG chat interface powered by the ASI API
• An MCP server for IDE integration (e.g., VS Code with Cline/Roo Code)

This PR also includes:

• Project documentation following the repository template
• .env.example for environment configuration
• Root README.md update to include the new community agent
• Community changelog entry

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Type of Change

• New agent example
• Bug fix
• Documentation update
• Refactor / cleanup
• Other

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Checklist

• I have starred this repository.
• New community agents are under contributors/<agent-name>/ (not repo root).
• I ran ruff check ..
• I ran ruff format ..
• I added/updated README.md for changed example(s).
• I added .env.example if environment variables are required.
• I added demo image/GIF (if applicable).
• I added agent profile link (if applicable).
• I updated contributors/CHANGELOG.md for community agent changes, or root CHANGELOG.md for other non-doc changes.
• I added my agent to the Community Contributors table in root README.md (if new agent).
• I verified paths/commands used in docs.
• I understand this PR requires maintainer review before merge (review-required CI).

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Related Issue

closes #152

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Notes for Reviewers

This agent demonstrates a local RAG pipeline that continuously indexes workspace files and exposes contextual retrieval through both a Streamlit interface and the Model Context Protocol (MCP).

Reviewers may want to focus on:

• README structure and documentation
• MCP server configuration
• Streamlit workflow
• Project organization under contributors/workspace-context-provider/

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