feat(e2e): render direct/recorder/debug/tcplogger/stress sections in the unified report

Extends report_build.py with build_by_kind() (per-scenario-kind pass/fail
rollup) and a ported build_stress()/stress_headline()/stress_plots() (scaling
curves per stress axis), wires both into the headline KPIs, regression
tracking, and report_data.json. E2E_Report.typ renders the four new
per-kind tables plus a Stress Tests section (per-axis case tables + scaling
plots, gracefully degrading to placeholders when a kind/stress data is
absent). run_e2e.sh now passes --stress-results so the report actually
receives real stress data instead of silently omitting it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Test/E2E/suite/run_e2e.sh

@@ -479,7 +479,8 @@ fi
 
 # ── Consolidated report data (+ history/regression + trend plots) ────────────
 ${PY} "${SCRIPT_DIR}/report_build.py" --repo "${REPO_ROOT}" \
-    --results "${OUT_DIR}/results.json" --work "${WORK}" --out "${OUT_DIR}" || true
+    --results "${OUT_DIR}/results.json" --work "${WORK}" --out "${OUT_DIR}" \
+    --stress-results "${OUT_DIR}/stress/stress_results.json" || true
 
 # ── PDF ──────────────────────────────────────────────────────────────────────
 if command -v typst >/dev/null 2>&1 && [ -f "${SCRIPT_DIR}/E2E_Report.typ" ]; then