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- Implement complete rootless network namespace bootstrap via C launcher using unshare(CLONE_NEWUSER | CLONE_NEWNS | CLONE_NEWNET).
- Resolve unprivileged network isolation blackhole via host-socket preservation (FD passing): open client UDP sockets on the host pre-isolation, clear O_CLOEXEC, and ingest them via custom `FDBind` inside the sandbox.
- Implement isolated routing table automation over `tun0` (addresses, MTU, default routes).
- Implement persistent, multi-process namespace sharing and joining using reference-counted PID files and the setns system call.
- Write robust, self-contained E2E data plane test suites in `tests/e2e/e2e_test.go` using a mock UDP listener.
- Update project documentation (`README.md` and `AGENTS.md`) to reflect completed milestones.
- Ensure 100% test passing rate and zero lint/staticcheck warnings.
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