refactor: add taskfile and workflow tooling

[paralta]

This PR adds the build, test, CI/CD, and release tooling required to operate dir-runtime as a standalone repository, migrated from the agntcy/dir monorepo.

• Add Taskfile.yml with code generation, build, test, lint, license, and release tasks
• Add docker-bake.hcl for multi-platform Docker image builds
• Add CI workflow with lint, license, verify, build, test, coverage, and tag-gated release jobs
• Add PR validation, CodeQL, container security scan, and post-release module tagging workflows
• Add versions.yaml with initial version v1.0.0 and update internal module versions
• Add golangci-lint, licensei, codecov, pre-commit, and Renovatebot configs
• Add RELEASE.md, CONTRIBUTORS.md, and update CHANGELOG.md with v1.0.0 details

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