test(e2e-chain): render Stress Tests section in the PDF report

Add a Stress Tests section (per-case table + per-axis scaling-curve images)
after Performance, guarded so it is omitted when no stress data is present.

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

Test/E2E/chain/E2E_Report.typ

@@ -220,6 +220,43 @@ MARTe2 processes, plus sustained client throughput (recorded samples ÷ duration
   }).flatten()
 )
 
+// ── stress / capacity ─────────────────────────────────────────────────────────
+#let stress = data.at("stress", default: none)
+#if stress != none [
+  = Stress Tests #h(6pt) #status_badge(stress.overall)
+  Capacity matrix: one load axis swept at a time. Hard gates — survival + client
+  liveness; soft gates — peak RSS and zoom p95 latency. The size axis crosses into
+  the multi-fragment (>64 KB packet) regime.
+  #v(4pt)
+  #table(
+    columns: (1.5fr, 1.6fr, 0.7fr, 0.7fr, 1fr, 1fr, 1fr, 1fr),
+    align: (left, left, right, center, right, right, right, right),
+    stroke: 0.4pt + rgb("#d0d7de"),
+    inset: 4pt,
+    table.header([*Case*], [*Axis*], [*Level*], [*Status*],
+                 [*MARTe RSS (MB)*], [*Hub RSS (MB)*],
+                 [*Hub CPU (s)*], [*Zoom p95 (ms)*]),
+    ..stress.cases.map(c => (
+      raw(c.id),
+      text(size: 8pt)[#c.axis],
+      [#c.level],
+      status_badge(c.status),
+      fnum(c.at("marte_rss_mb", default: none), digits: 1),
+      fnum(c.at("hub_rss_mb", default: none), digits: 1),
+      fnum(c.at("hub_cpu_s", default: none), digits: 2),
+      fnum(c.at("zoom_p95_ms", default: none), digits: 1),
+    )).flatten()
+  )
+  #let splots = data.at("stress_plots", default: ())
+  #if splots.len() > 0 [
+    #v(6pt)
+    == Scaling curves
+    #grid(columns: 2, gutter: 8pt,
+      ..splots.map(p => image(p, width: 100%))
+    )
+  ]
+]
+
 // ── per-scenario waveform fidelity ───────────────────────────────────────────
 = Scenarios
 #for sc in e2e.scenarios [