Remove temporary development files and documentation
- Remove test.cpp (accidentally committed GitHub diff HTML)
- Remove AGENTS.md, README.peg.md (AI agent guidance files)
- Remove docs/peg-testing-plan.md, pr-peg-migration.md,
test-divergence-analysis.md, testing-chat-parsers.md
(development/debugging documentation)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
