refactor: relocate agent-system/ to .agents/ with 7-role workflow restructure
Moves the agent workflow system from agent-system/ to .agents/ (dotfile convention). Restructured from 5-role to 7-role pipeline: adds Analyst and splits Reviewer into Code Reviewer + Security Reviewer. Removes all old workflow run artifacts. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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