feat: Add tutorial on securing pipelines against runaway costs and PII leaks

[nagasatish007]

New Tutorial: Securing Pipelines Against Runaway Costs and PII Leaks

Adds tutorial #50 demonstrating how to add deterministic governance to Haystack pipelines using TealTiger.

What it covers

1. Building a RAG pipeline with Haystack
2. Detecting PII (SSNs, credit cards) in pipeline context before it reaches the LLM
3. Detecting secrets/API keys in retrieved documents
4. Enforcing per-session cost budgets to prevent infinite agent loops
5. Creating a custom TealTigerGovernanceFilter Haystack component
6. Inspecting structured governance audit trails

Why this is useful for Haystack users

Once agents can call tools and query databases, new risks appear: PII flowing to the model, secrets in generated code, and cost runaway from infinite loops. This tutorial shows how to prevent all three with a deterministic governance layer that adds <5ms overhead and requires no additional LLM calls.

Tutorial metadata

• Level: Intermediate
• Time to complete: 20 min
• Dependencies: tealtiger
• Components used: OpenAIChatGenerator, Pipeline, custom @component

Checklist

• Follows the template.ipynb structure
• Includes installation, setup, step-by-step sections, and "About us" footer
• Added entry to index.toml
• File follows naming convention: 50_Securing_Pipelines_Against_Runaway_Costs_and_PII_Leaks.ipynb
• No API keys or secrets in the notebook

About TealTiger

TealTiger is an open-source (Apache 2.0) deterministic governance SDK for AI agents. It provides PII detection, secret scanning (500+ patterns), cost tracking, and policy enforcement with <5ms overhead and no LLM in the governance path. Available on PyPI and npm.

Note: TealTiger is already listed as a community integration in the Haystack documentation:
https://haystack.deepset.ai/integrations/tealtiger

The tealtiger-haystack package is available on PyPI and follows the Haystack integration pattern. This tutorial complements the existing integration page by providing a hands-on walkthrough showing the governance capabilities in action within a pipeline context.

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