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0c4ec8c38c
Consume the eBPF impairment classifier delivered in uBridge feature/tc-precision: frequency_drop becomes the exact every-Nth mode (tc nth_drop; -1 = drop everything maps to every 1st) and the new kernel-only quota type is the byte-cap mode (tc quota_drop, 100 = hard cutoff). KERNEL_UNSUPPORTED_FILTERS is gone entirely — kernel/relay eligibility is now purely topological. Both modes gate on ebpf=1 from the per-process tc capabilities probe (error names the setcap fix); the cleanup path (modes off) only talks to the eBPF commands when the probe reported them. Reconcile is a plain re-set: the netem reset-before-set already detaches the program and clears uBridge's per-interface registry, so a mode set after it is a fresh load+attach. Documented semantic difference: the relay counts both directions through one bridge counter, the kernel counts per direction — N=3 round-trip loss is 1-(2/3)^2 = 55.6% on kernel vs ~1/N on relay (measured 57%). window_drop is NOT exposed: the delivered implementation advances the window with no gap, making 'outside the window packets pass' unreachable (needs outage/period fields — recorded in the spec); flow_drop awaits a parameter-shape decision. Also fixes a pre-existing restart bug the e2e exposed: _bridges (relay bridge names) was never cleared on stop, so restarting a node with a relay link skipped 'bridge create' and failed on add_nio_udp. e2e (isolated instance): 13/13 — pref-1 tc_impair classifier on both veths, 57% round-trip for N=3, -1 = exact 100%, quota hard cutoff, delay coexistence, clean teardown, suspend/resume, node restart, relay-leg frequency_drop regression through an Ethernet switch. Full suite: 1925 passed.