Add periodic Noise rekey with fresh DH for forward secrecy (FMP + FSP)

Implement periodic full rekey at both protocol layers using fresh DH
key exchanges. Uses the existing K-bit flag (FLAG_KEY_EPOCH /
FSP_FLAG_K) to coordinate cutover between peers.

FMP layer (IK pattern):
- ActivePeer gains rekey state: pending/previous sessions, K-bit epoch
  tracking, drain window, dampening timer
- Handshake state stored on ActivePeer with msg1 sent on existing link
- Encrypted frame handler detects K-bit flips, promotes pending
  sessions, falls back to previous session during drain
- Handshake handlers distinguish rekey from new connections using
  addr_to_link lookup with identity-based fallback
- Free all session indices (current, rekey, pending, previous) on
  peer removal

FSP layer (XK pattern):
- SessionEntry gains parallel rekey fields with XK-specific state
  for the 3-message handshake
- Route availability check before FSP rekey initiation
- Encrypted session handler adds K-bit flip detection and dual-session
  decrypt fallback
- SessionSetup/Ack/Msg3 handlers extended for rekey paths

Defense-in-depth:
- Consecutive decryption failure detector (threshold=20) triggers
  forced peer removal instead of waiting for link-dead timeout
- Identity-based rekey detection as fallback when addr_to_link
  doesn't match (e.g., TCP ephemeral ports)

Configuration: RekeyConfig with enabled flag, after_secs (default 120),
and after_messages (default 65536) thresholds.

Logging: info for successful K-bit cutover completions, warn for
failures, debug for intermediate handshake steps, trace for routine
operations (resends, drain cleanup).

Rekey lifecycle:
1. Timer/counter fires -> initiator starts new handshake
2. Old session continues handling traffic during handshake
3. Handshake completes -> initiator cuts over, flips K-bit
4. Responder sees flipped K-bit -> promotes new session
5. Both keep old session for 10s drain window
6. After drain, old session discarded

Integration test: Docker-based multi-phase test exercising both FMP
and FSP rekey with aggressive timers (35s). Verifies connectivity
across all 20 directed pairs survives two consecutive rekey cycles.
Includes rekey topology, docker-compose profile, and CI matrix entry.

Increase ping test convergence wait from 3s to 5s for CI reliability.

testing/static/scripts/ping-test.sh

@@ -52,8 +52,8 @@ echo "=== FIPS Ping Test ($PROFILE topology) ==="
 echo ""
 
 # Wait for nodes to converge
-echo "Waiting 3s for mesh convergence..."
-sleep 3
+echo "Waiting 5s for mesh convergence..."
+sleep 5
 
 if [ "$PROFILE" = "mesh" ] || [ "$PROFILE" = "mesh-public" ]; then
     # Sparse mesh topology: A-B, B-C, C-D, D-E, E-A, A-D