chore(main): release 0.5.0

[github-actions]

🤖 I have created a release beep boop

0.5.0 (2025-12-31)

Features

• Add dynamic per-tenant OIDC/SSO authentication (#903) (ed05a41)
• Add format template picker UI for AdCP 2.5 parameterized formats (#782) (#882) (532657e)
• Add vidium MCP server to local configuration (#904) (ebcfdd1)
• Convert advertising channel from single to multi-select (#897) (a1aa8e4)
• Display sales agent version in agent card (#902) (663702b)
• Implement AI product ranking with simplified catalog (#906) (d59e76b)
• Simplify user authorization with User records as primary auth method (#907) (504b489)

Bug Fixes

• src.core.format_spec_cache undefined (#901) (e3e701c)
• Use pull_request_target for PR title check on fork PRs (#909) (bb9817d)

Documentation

• Clarify SUPER_ADMIN_EMAILS is optional with per-tenant OIDC (#905) (399b255)

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