release: promote dev to main (archived changes and updated specs)

[djm81]

Summary

• promote the current dev branch to main
• include the archived OpenSpec changes committed in 444a44e
• publish the synced spec updates now present under openspec/specs/

Included spec updates

• backlog-add
• contract-runner
• modules-docs-publishing
• radon-runner
• review-cli-contracts
• review-run-command
• ruff-runner
• test-tdd-gate

Notes

• source branch: dev
• target branch: main
• local verification: origin/dev is one commit ahead of origin/main with archived changes and updated specs

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