Radius v0.59.0-rc1

What's Changed

## changelog

• add workspace create --preview by @nithyatsu in #11905
• Modify rad install to create default resource group and environment by @zachcasper in #11870
• chore(release): v0.58.0 by @DariuszPorowski in #11984
• Fix Helm chart pre-mounted Terraform binary path mismatch by @willdavsmith in #11880
• converts the radius-code-review prompt into a skill by @nellshamrell in #11961
• Add --preview flag for 'rad app graph' and 'rad app status' by @lakshmimsft in #11983
• build(deps): bump the github-actions group across 2 directories with 7 updates by @dependabot[bot] in #12004
• build(deps): bump the go-dependencies group across 2 directories with 21 updates by @dependabot[bot] in #12006
• Cherry-pick #11712: app graph design into main by @Copilot in #11998
• Fix Test_Flux_Complex namespace teardown flake by @willdavsmith in #12013
• Improve line-number accuracy in radius-code-review skill by @brooke-hamilton in #12017
• Architecture doc describing credentials by @brooke-hamilton in #11837
• build(deps): bump the github-actions group across 1 directory with 5 updates by @dependabot[bot] in #12050
• build(deps): bump the go-dependencies group across 1 directory with 18 updates by @dependabot[bot] in #12051
• Fix recipe pack OCI tags to use full semver version by @lakshmimsft in #12027
• add persistence packages for graph by @nithyatsu in #12008
• Align configuration options for rad env create and rad env update commands by @Copilot in #11774
• build(go): bump to 1.26.4 by @DariuszPorowski in #12054
• Update test framework to support RRTs by @lakshmimsft in #12012
• ci: disable fail-fast in functional test by @DariuszPorowski in #12055
• fix(test): make Test_TerraformRecipe_AzureResourceGroup safe under concurrent CI by @sylvainsf in #12062
• build(deps): bump the go-dependencies group across 2 directories with 11 updates by @dependabot[bot] in #12060
• build(deps-dev): bump the npm-dependencies group across 2 directories with 5 updates by @dependabot[bot] in #12037
• build(go): bump to 1.26.4 by @DariuszPorowski in #12059
• ci: env var and token handling improvements by @DariuszPorowski in #12072
• ci(docs): use GitHub App and improve sync by @DariuszPorowski in #12077
• support rad app graph app.bicep (modeled graphs) by @nithyatsu in #12057
• build(deps): bump the github-actions group across 1 directory with 3 updates by @dependabot[bot] in #12088
• build(deps): bump the npm-dependencies group across 4 directories with 12 updates by @dependabot[bot] in #12087
• Update app.bicep for preview command by @sk593 in #12082
• Default Kubernetes namespace to "default" for new Radius.Core environments by @willdavsmith in #12045
• ci(deps): update repo-files-sync action and change token usage by @DariuszPorowski in #12094
• Add markdown instructions aligned with markdownlint config by @brooke-hamilton in #12093
• Honor x-ms-client-flatten in Bicep type generator by @willdavsmith in #12001
• Show deprecation warning for rad run with extensible Radius.Core environments by @Copilot in #12042
• Radius.Compute/containerImages design by @willdavsmith in #11734
• Deployment lineage graph storage proposal by @brooke-hamilton in #11848
• Direct module support for Recipes by @Reshrahim in #11876
• Update container mechanics tests by @lakshmimsft in #12084
• Migrate Container tests to use new RRTs by @lakshmimsft in #12076
• docs(contributing): Agent Ex Phase 0 — authoring and conventions guides by @brooke-hamilton in #12095
• add a secret so the debug setup works by @nithyatsu in #12103
• Add default Contour Gateway for route recipes by @willdavsmith in #11995
• Add new User Journey issue template by @zachcasper in #12123
• Resource type icons feature specification by @brooke-hamilton in #12011
• ci(release): use GitHub App token instead of PAT by @DariuszPorowski in #12131
• ci(purge-old-images): use GitHub App instead of PAT by @DariuszPorowski in #12130
• ci(purge-old-images): resolve dev container image names by @DariuszPorowski in #12135
• ci(purge-old-images): switch to classic PAT for deleting old dev container images by @DariuszPorowski in #12136
• Add copilot-setup-steps.yml to provision the Copilot Cloud Agent environment (Agent Ex Phase 2) by @brooke-hamilton in #12133
• Document Radius extensibility architecture document by @brooke-hamilton in #11994
• ci(purge-old-images): optimize image deletion by selecting only tagged images by @DariuszPorowski in #12137
• Agent Ex Phase 1: single AGENTS.md entry point with copilot-instructions.md symlink by @brooke-hamilton in #12105
• Radius.Compute/containerImages type: add rootless BuildKit sidecar to dynamic-rp chart by @willdavsmith in #11882
• Update resource-types-contrib reference (pre-release) by @lakshmimsft in #12142
• chore(release): Release candidate v0.59.0-rc1 by @lakshmimsft in #12143

Full Changelog: v0.58.0-rc2...v0.59.0-rc1