Enable AWF sandbox in dev.md

[Copilot]

• Enable AWF sandbox in dev.md workflow
• Revert unrelated file changes (pkg/cli/templates/upgrade-agentic-workflows.md, specs/artifacts.md)

Changes

• Updated .github/workflows/dev.md frontmatter from sandbox: false to sandbox: { agent: awf }
• Updated .github/workflows/dev.lock.yml with AWF sandbox configuration

Original prompt

enable awf sandbox to dev.md

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[Mossaka]

@copilot why does the changes include files not related to dev.md?

[Copilot]

@copilot why does the changes include files not related to dev.md?

Those files were accidentally included. I've reverted them in cf42fd5. The PR now only includes changes to .github/workflows/dev.md and .github/workflows/dev.lock.yml.