feat: Add SwiftAPI cryptographic attestation for agent governance

lib/crewai/src/crewai/swiftapi_integration/README.txt

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+SwiftAPI Integration for CrewAI
+
+Cryptographic attestation for CrewAI tool invocations and crew execution.
+Every action requires authorization before execution. No attestation, no execution.
+
+Files:
+- config.py: SwiftAPIConfig dataclass
+- attestation.py: HTTP client and attestation provider
+- tools.py: SwiftAPIStructuredTool wrapping CrewStructuredTool
+- crew.py: SwiftAPICrew wrapping Crew for multi-agent attestation
+- demo.py: Standalone test against live SwiftAPI
+
+Usage:
+
+    from crewai import Crew, Agent, Task
+    from crewai.swiftapi_integration import SwiftAPICrew
+
+    crew = Crew(agents=[...], tasks=[...])
+    swiftapi_crew = SwiftAPICrew(
+        crew=crew,
+        swiftapi_key="swiftapi_live_..."  # or set SWIFTAPI_KEY env var
+    )
+    result = swiftapi_crew.kickoff(inputs={...})
+
+Or wrap individual tools:
+
+    from crewai.swiftapi_integration import SwiftAPIStructuredTool
+
+    tool = SwiftAPIStructuredTool(
+        name="my_tool",
+        description="Does something",
+        args_schema=MyArgs,
+        func=my_func,
+        swiftapi_key="swiftapi_live_..."
+    )
+
+Configuration:
+
+    SwiftAPIConfig(
+        api_key="swiftapi_live_...",     # required
+        base_url="https://swiftapi.ai",   # default
+        app_id="crewai",                  # default
+        actor="crewai-agent",             # default
+        timeout=10,                        # seconds
+        fail_open=False,                   # NEVER set True in production
+        verbose=True,                      # log attestation status
+    )
+
+Test:
+
+    export SWIFTAPI_KEY="swiftapi_live_..."
+    python demo.py
+
+Get a key: https://getswiftapi.com

lib/crewai/src/crewai/swiftapi_integration/__init__.py

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+"""
+SwiftAPI Integration for CrewAI
+
+Provides cryptographic attestation for CrewAI tool invocations and crew execution.
+Every action is verified against SwiftAPI policies before execution.
+No attestation, no execution.
+
+Usage:
+    # Wrap a crew with attestation
+    from crewai import Crew, Agent, Task
+    from crewai.swiftapi_integration import SwiftAPICrew
+
+    crew = Crew(agents=[...], tasks=[...])
+    swiftapi_crew = SwiftAPICrew(
+        crew=crew,
+        swiftapi_key="swiftapi_live_..."  # or set SWIFTAPI_KEY env var
+    )
+    result = swiftapi_crew.kickoff(inputs={...})
+
+    # Or wrap individual tools
+    from crewai.swiftapi_integration import SwiftAPIStructuredTool
+
+    tool = SwiftAPIStructuredTool(
+        name="my_tool",
+        description="Does something",
+        args_schema=MyArgs,
+        func=my_func,
+        swiftapi_key="swiftapi_live_..."
+    )
+
+Configuration:
+    from crewai.swiftapi_integration import SwiftAPIConfig
+
+    config = SwiftAPIConfig(
+        api_key="swiftapi_live_...",    # required
+        base_url="https://swiftapi.ai",  # default
+        app_id="crewai",                 # default
+        actor="crewai-agent",            # default
+        timeout=10,                      # seconds
+        fail_open=False,                 # NEVER set True in production
+        verbose=True,                    # log attestation status
+    )
+
+Get a key: https://getswiftapi.com
+"""
+
+from .attestation import (
+    AttestationError,
+    AttestationProvider,
+    AttestationResult,
+    MockAttestationProvider,
+    PolicyViolationError,
+    SwiftAPIAttestationProvider,
+)
+from .config import SwiftAPIConfig
+from .crew import SwiftAPICrew
+from .tools import SwiftAPIStructuredTool, wrap_tools
+
+__all__ = [
+    # Config
+    "SwiftAPIConfig",
+    # Attestation
+    "AttestationError",
+    "AttestationProvider",
+    "AttestationResult",
+    "MockAttestationProvider",
+    "PolicyViolationError",
+    "SwiftAPIAttestationProvider",
+    # Tools
+    "SwiftAPIStructuredTool",
+    "wrap_tools",
+    # Crew
+    "SwiftAPICrew",
+]