Christian Nennemann
f4621b3425
feat: add traffic analysis resistance (Phase 7.7 + F8)
- Core: add pad_uniform/unpad_uniform for configurable boundary padding
and generate_decoy for indistinguishable decoy messages
- Server: add traffic_resistance module with payload padding, timing
jitter, and background decoy traffic generator (feature-gated)
- P2P: add mesh traffic_resistance module with padded envelopes and
mesh decoy injection (feature-gated)
- All gated behind --features traffic-resistance
- 22 new tests across core (8), server (4), and P2P (5)