Add purview-developer skill

[yulcodeoy]

Summary

Adds a new purview-developer skill that teaches AI coding agents how to correctly build on the Microsoft Purview Developer Platform.

Scenarios covered

1. Reading and applying sensitivity labels — listing tenant labels via GET /security/dataSecurityAndGovernance/sensitivityLabels
2. Logging contentActivity events — creating audit records via POST /users/{id}/dataSecurityAndGovernance/activities/contentActivities
3. Reading governance state — computing protection scopes and processing content via protectionScopes/compute and processContent APIs
4. Agent Framework integration — wiring Purview middleware into Agent Framework agents using Microsoft.Agents.AI.Purview (C#) and agent-framework-purview (Python)

Key features

• Decision guidance table: answers "which Purview surface do I call?" — Graph APIs directly vs. Agent Framework middleware
• Working C# and Python examples for all four canonical scenarios
• Anti-patterns section: common mistakes agents generate (wrong endpoints, legacy APIs, double-counting, wrong auth scopes, missing caching, ignoring execution mode) with correct replacements
• "When NOT to use" section: clarifies this is for developers, not admin/portal tasks

References

All content grounded in these authoritative sources:

• https://learn.microsoft.com/en-us/purview/developer/
• https://github.com/microsoft/purview-api-samples
• https://learn.microsoft.com/en-us/graph/security-datasecurityandgovernance-overview
• https://learn.microsoft.com/en-us/graph/api/resources/contentactivity?view=graph-rest-1.0
• https://learn.microsoft.com/en-us/graph/api/resources/security-sensitivitylabel?view=graph-rest-1.0
• https://learn.microsoft.com/en-us/graph/api/resources/tenantdatasecurityandgovernance?view=graph-rest-1.0
• https://learn.microsoft.com/en-us/graph/api/resources/userdatasecurityandgovernance?view=graph-rest-1.0
• https://learn.microsoft.com/en-us/agent-framework/integrations/purview?pivots=programming-language-csharp
• https://github.com/microsoft/agent-framework/tree/main/dotnet/src/Microsoft.Agents.AI.Purview
• https://github.com/microsoft/agent-framework/tree/main/python/packages/purview

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