v1.0.0

Changelog

• 10a1648 feat: NL-to-DAG construction — /run --dag (TODO 3.4)
• 9d4325c feat: goreleaser release workflow — auto-build on tag push
• 5c491e0 fix: resolve WorkspaceRoot to absolute path instead of hardcoded "."
• 723e958 fix: shell completions — add 13 missing commands to zsh/bash/fish + REPL