🏗️ Extract tome from spire into standalone plugin
Tome is opt-in per project — each project declares its own knowledge management approach. Spire retains a small knowledge-awareness skill that explains what tome does and provides a fallback strategy for projects without it. - New plugins/tome/ with own manifests, README, all 5 sub-skills - Spire keeps skills/knowledge/SKILL.md as awareness stub - Updated all READMEs and marketplace JSONs - tome: namespace refs now correct (tome is its own plugin)
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