Add TealTiger governance integration (#497)

* Create TealTiger integration documentation

Add documentation for TealTiger integration with Haystack, including installation, usage examples, and features.

* Create tealtiger.png

* Delete logos/tealtiger.png

* Add files via upload

* Address review: add toc, fix imports, add license section

Author: nagasatish007

integrations/tealtiger.md

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+---
+layout: integration
+name: TealTiger
+description: Deterministic governance, cost tracking, and PII detection for Haystack pipelines. No LLM in the governance path.
+authors:
+  - name: TealTiger
+    socials:
+      github: agentguard-ai
+      twitter: TealtigerAI
+      linkedin: https://www.linkedin.com/company/tealtiger
+pypi: https://pypi.org/project/tealtiger-haystack
+repo: https://github.com/agentguard-ai/tealtiger
+type: Custom Component
+report_issue: https://github.com/agentguard-ai/tealtiger/issues
+logo: /logos/tealtiger.png
+version: Haystack 2.0
+toc: true
+---
+
+### **Table of Contents**
+- [Overview](#overview)
+- [Installation](#installation)
+- [Usage](#usage)
+- [Features](#features)
+- [Support](#support)
+- [License](#license)
+
+## Overview
+
+[![PyPI - Version](https://img.shields.io/pypi/v/tealtiger-haystack.svg)](https://pypi.org/project/tealtiger-haystack)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/tealtiger-haystack.svg)](https://pypi.org/project/tealtiger-haystack)
+
+Add deterministic governance to any Haystack pipeline. No LLM in the governance path — all policy evaluation is deterministic, adding <2ms latency.
+
+## Installation
+
+```bash
+pip install tealtiger-haystack
+```
+
+## Usage
+
+### Zero-Config Mode (Observe)
+
+No policies needed — just add the component and get instant visibility into cost, PII, and tool usage:
+
+```python
+from haystack import Pipeline
+from haystack.components.generators import OpenAIGenerator
+from haystack_integrations.components.connectors.tealtiger import TealTigerGovernanceComponent
+
+pipeline = Pipeline()
+pipeline.add_component("governance", TealTigerGovernanceComponent())
+pipeline.add_component("llm", OpenAIGenerator(model="gpt-4o-mini"))
+pipeline.connect("governance.text", "llm.prompt")
+
+result = pipeline.run({"governance": {"text": "What is the capital of France?"}})
+
+# Access governance decision
+decision = result["governance"]["decision"]
+print(decision["action"])         # "ALLOW"
+print(decision["cost_tracked"])   # 0.0023
+print(decision["pii_detected"])   # []
+```
+
+### Policy Mode (Enforce)
+
+Add a TealEngine with policies for full governance enforcement:
+
+```python
+from haystack import Pipeline
+from haystack.components.generators import OpenAIGenerator
+from tealtiger import TealEngine
+from haystack_integrations.components.connectors.tealtiger import TealTigerGovernanceComponent
+
+engine = TealEngine(policies=[
+    {"type": "cost_limit", "max_per_session": 5.00},
+    {"type": "pii_block", "categories": ["ssn", "credit_card"]},
+])
+
+pipeline = Pipeline()
+pipeline.add_component(
+    "governance",
+    TealTigerGovernanceComponent(engine=engine, mode="ENFORCE"),
+)
+pipeline.add_component("llm", OpenAIGenerator(model="gpt-4o-mini"))
+pipeline.connect("governance.text", "llm.prompt")
+
+result = pipeline.run({"governance": {"text": "Process payment for card 4111-1111-1111-1111"}})
+# PII detected → action: "DENY"
+```
+
+## Features
+
+- **Deterministic** — Same input + same policy = same decision, every time
+- **<2ms overhead** — No LLM in the governance path
+- **Zero-config mode** — Observe cost, PII, and behavior without writing policies
+- **Policy enforcement** — ALLOW, DENY, REQUIRE_APPROVAL, REVISE decisions
+- **Cost tracking** — Per-request and cumulative session cost
+- **PII detection** — Email, phone, SSN, credit card, IP address patterns
+- **Audit trail** — Every decision produces a structured evidence record
+- **TEEC receipts** — Compliance-grade execution receipts with correlation IDs
+
+## Support
+
+- [GitHub Issues](https://github.com/agentguard-ai/tealtiger/issues)
+- [TealTiger Documentation](https://tealtiger.ai)
+- [OWASP ASI Coverage](https://github.com/agentguard-ai/tealtiger) — 8/10 Agentic Security Index categories
+
+## License
+
+`tealtiger-haystack` is distributed under the [Apache 2.0 License](https://opensource.org/licenses/Apache-2.0).