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- Introduce `namespace.Ops` interface to decouple `Manager` from system-level namespace operations, enabling easier unit testing via mocks.
- Add unit tests for `internal/paths` to verify path resolution logic across different environment configurations.
- Implement `EnsureBinary` helper in E2E tests to gracefully skip tests when `WG_WRAP_BIN` is not set, allowing `go test ./...` to pass in non-build environments.
- Apply project-wide formatting and fix linting issues.
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- Fix DNS resolver leaks by creating temporary resolv.conf files within the profile's runtime directory and ensuring robust cleanup.
- Fix isolation block directory leaks by explicitly removing the block directory during namespace unpinning.
- Improve namespace lifecycle management:
- Register processes before joining an active namespace to prevent race conditions in reference counting.
- Update `IsLastProcess` and corresponding tests to reflect the unregister-then-check cleanup flow.
- Improve test reliability and correctness:
- Convert `TestAppRun_ProfileDirInjection` to use separate binary execution, preventing process replacement and ensuring `t.TempDir()` cleanup.
- Replace hardcoded test configuration paths with `t.TempDir()` in `mount_leak_test.go`.
- Implement `SetEnvOverrides` helper for cleaner environment variable management in E2E tests.
- Improve E2E lifecycle tests with better environment handling and output redirection.
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- Security: Eliminate namespace escape risk by removing `HostBind` and enforcing `FDBind` using pre-opened host socket FDs.
- Security: Replace unsafe `atoi` with `strtol` and strict validation in the C launcher to prevent malformed PID joins.
- Stability: Fix PID wraparound by storing session timestamps in PID files to detect recycled PIDs.
- Stability: Resolve DNS mount leaks by implementing proper unmounting of `/etc/resolv.conf` during tunnel shutdown.
- Performance: Optimize `FDBind` throughput by implementing batch packet processing in the receive loop.
- Deployment: Implement `memfd_create` for the C launcher to support `noexec` temporary directories and reduce disk I/O.
- Maintenance: Replace external `ip` CLI dependency with native `netlink` library for robust network configuration.
- Quality: Fix all `golangci-lint` errors and replace remaining panics with explicit error handling.
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