Fix review P2s: lockfile, model path convention, trap robustness

- Regenerate uv.lock after adding fastapi/uvicorn deps so uv sync
  --locked no longer fails
- B3 scripts: default MODEL to $HOME/models/... matching documented
  convention and other launch scripts (repo has no models/ directory)
- launch_elastic_p2p: append || true to each trap command so set -e
  doesn't abort cleanup when jobs -p is empty and EngineCore orphans
  remain

scripts/b3_isolated_policy.sh

@@ -13,7 +13,7 @@ set -euo pipefail
 
 ROOT="${ROOT:-$(cd "$(dirname "$0")/.." && pwd)}"
 VENV="$ROOT/.venv/bin"
-MODEL="${MODEL:-$ROOT/models/Qwen/Qwen3-Coder-30B-A3B-Instruct}"
+MODEL="${MODEL:-$HOME/models/Qwen/Qwen3-Coder-30B-A3B-Instruct}"
 PROXY_PORT="${PROXY_PORT:-9300}"
 BASE_PORT="${BASE_PORT:-8000}"
 GPU_INDICES="${GPU_INDICES:-0 1 2 3 4 5 6 7}"

scripts/b3_sweep.sh

@@ -16,7 +16,7 @@ set -euo pipefail
 
 ROOT="${ROOT:-$(cd "$(dirname "$0")/.." && pwd)}"
 VENV="$ROOT/.venv/bin"
-MODEL="${MODEL:-$ROOT/models/Qwen/Qwen3-Coder-30B-A3B-Instruct}"
+MODEL="${MODEL:-$HOME/models/Qwen/Qwen3-Coder-30B-A3B-Instruct}"
 TRACE="${TRACE:-$ROOT/traces/w600_r0.0015_st30.jsonl}"
 OUTDIR="${OUTDIR:-$ROOT/outputs/b3_sweep_$(date +%Y%m%d_%H%M%S)}"
 PROXY_PORT="${PROXY_PORT:-9300}"

scripts/launch_elastic_p2p.sh

@@ -27,7 +27,7 @@ PROXY_PORT=9090
 HEAVY_THRESHOLD="${HEAVY_THRESHOLD:-20000}"
 MAX_OFFLOAD="${MAX_OFFLOAD:-4}"
 
-trap 'echo "Cleaning up..."; kill $(jobs -p) 2>/dev/null; pkill -9 -f "vllm serve" 2>/dev/null; pkill -9 -f "EngineCore" 2>/dev/null; pkill -9 -f cache_aware_proxy 2>/dev/null; wait 2>/dev/null' EXIT INT TERM
+trap 'echo "Cleaning up..."; kill $(jobs -p) 2>/dev/null || true; pkill -9 -f "vllm serve" 2>/dev/null || true; pkill -9 -f "EngineCore" 2>/dev/null || true; pkill -9 -f cache_aware_proxy 2>/dev/null || true; wait 2>/dev/null || true' EXIT INT TERM
 
 echo "=== Elastic P2P Offload (${N_INSTANCES}× TP=1 kv_both) ==="
 echo "  Model:           $MODEL"