Agent Category Shift

Before #1516 the docs claimed 7 categories summing to 28 agents while CLAUDE.md said 37 — categories were stale, not just counts. This shows the consolidated grouping that ships in this PR (7 readable categories, summing to 37, all 37 agents listed).

Prompt for Claude

The new agents/overview.mdx category breakdown sums to 37 (was 28). All 37 agents are listed with corrected models pulled from src/agents/*.md frontmatter (opus 6, sonnet 11, haiku 7, inherit 13).