Fix documentation count inconsistencies across project files

[PAMulligan]

Summary

Agent and skill counts are inconsistent across documentation files, creating confusion about the actual state of the framework.

Inconsistencies Found

File	Claims	Actual
CLAUDE.md header	"53 agents, 19 skills"	Needs verification
CLAUDE.md agent table	Lists 53 agents	—
docs/onboarding/README.md	References "19 skills"	May not match
README.md	May reference different counts	Needs check

Acceptance Criteria

• Audit actual count of agents in .claude/agents/
• Audit actual count of skills in .claude/skills/
• Update all references across CLAUDE.md, README.md, onboarding docs, and any other files
• Add a note in CLAUDE.md about keeping counts in sync when adding/removing agents or skills