Update WORKFLOW.subaru.md

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Move Subaru-specific ads guidance into workflow

Fix workspace setup bootstrap flow

Require skill_version bumps on skill updates

Require workspace-local skill installs in setup templates

Merge agent-skills into smart-skill-maker

Reorganize smart-skill-maker as a standalone skill

refactor(workspace-setup): simplify version markers

refactor(workspace-setup): clarify skill bootstrap rules

feat(skills): add workspace-autoresearch skill

skills: add skill version metadata and workspace banners

docs: unify workspace bootstrap and skill authoring flow

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feat: add subaru ads workflow and source-pack skills