feat: entrypoint.zig — replace 942 LOC bash with Zig + Telegram live UX

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Что

Переписать deploy/agent-entrypoint.sh (942 LOC bash) → tools/mcp/trinity_mcp/agent/entrypoint.zig

Зачем

• Убивает 10/23 уязвимостей из аудита (P0 ci: Bump actions/upload-artifact from 4 to 6 #1,3,5,6 + P1 feat(vibee-v6): Multi-Language Codegen with Implementation Support #10,11,14 + P2 ci: bump docker/build-push-action from 5 to 6 #19,20,22)
• Telegram live edit UX (не спам)
• Docker ~200MB → меньше (Zig binary)
• Compile-time safety, тесты

Scope

1. entrypoint.zig — main loop (8 steps)
2. telegram_card.zig — TelegramCard, edit loop 30s
3. telegram.zig — sendAndCapture + editMessage + pinMessage
4. github_api.zig — issue read, comment, PR create
5. git_ops.zig — clone, worktree, push
6. self_review.zig — fmt/build/test gates
7. process_spawn.zig — spawn with timeout
8. Dockerfile.agent — use Zig binary
9. tests

Telegram UX

• Pinned dashboard: edit every 30s
• Per-agent card: edit every 30s
• Issue summary: one sendMessage on completion
• Zero spam

Status

✅ IMPLEMENTED — all files created, builds clean, dry-run works