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hifi-phil ef282a5211 docs: Add CLAUDE.md documentation for key .NET projects (#20841 )

* docs: Add CLAUDE.md documentation for key .NET projects

Add comprehensive CLAUDE.md files for major Umbraco projects:
- Root CLAUDE.md: Multi-project repository overview
- Umbraco.Core: Interface contracts and domain models
- Umbraco.Infrastructure: Implementation layer (NPoco, migrations, services)
- Umbraco.Cms.Api.Common: Shared API infrastructure
- Umbraco.Cms.Api.Management: Management API (1,317 files, 54 domains)
- Umbraco.Web.UI.Client: Frontend with split docs structure

Each file includes:
- Architecture and design patterns
- Project-specific workflows
- Edge cases and gotchas
- Commands and setup
- Technical debt tracking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update src/Umbraco.Cms.Api.Management/CLAUDE.md

Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Andy Butland <abutland73@gmail.com>
Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>

* docs: Update CLAUDE.md with accurate persistence and auth info

- Clarify NPoco is current and fully supported (not legacy)
- Document EF Core as future direction with ongoing migration
- Add secure cookie-based token storage details for v17+
- Update OpenIddict authentication documentation
- Update API versioning (v1.0 and v1.1)
- Minor documentation cleanups (community links, descriptions)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update src/Umbraco.Web.UI.Client/docs/agentic-workflow.md

* Update src/Umbraco.Web.UI.Client/docs/agentic-workflow.md

* Apply suggestions from code review

* Clarifications and duplicate removal.

---------

Co-authored-by: Phil Whittaker <pjw@umbraco.dk>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>
Co-authored-by: Andy Butland <abutland73@gmail.com>
Co-authored-by: Sven Geusens <geusens@gmail.com>