feat(personas): add 4 Tier 1 personas with bundled skills and direct commands
- Content Strategist: 6 commands (/content:audit, cluster, brief, calendar, repurpose, seo), 8 bundled skills
- Product Manager: 7 commands (/pm:story, prd, prioritize, experiment, sprint, retro, metrics), 6 bundled skills
- DevOps Engineer: 7 commands (/devops:deploy, infra, docker, monitor, incident, security, cost), 4 bundled skills
- Finance Lead: 6 commands (/finance:model, fundraise, pricing, burn, unit-economics, board), 2 bundled skills
Total personas: 3 → 7
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