feat(engine,producer,cli): drawElement release telemetry on render_complete (#2002)

Default-on drawElement ships with a runtime self-verification net (#1998);
this makes its in-the-wild behavior observable. Every render_complete event
now answers: which capture mode actually ran, why drawElement disengaged
when it did (compile gate / producer clamp / engine init gate), whether the
self-verify net fired and why, and how much margin verification had.

Follows the static-dedup telemetry pattern: engine session fields →
CapturePerfSummary → RenderPerfSummary.drawElement → snake_case props on
render_complete.

New event props: de_capture_mode, de_compile_gate, de_clamp_reason,
de_gate_reason, de_worker_encode, de_verify_armed, de_verify_checked,
de_verify_min_db (margin above the 32dB threshold — drift here is the
early-warning signal before fallbacks spike), de_verify_init_ms,
de_self_verify_fallback, de_fallback_reason, de_blank_suspects,
de_blank_deterministic_accepts, de_blank_recaptures, de_boundary_frames,
de_ncpr_fallbacks.

Validated end-to-end on live renders: drawelement path reports mode/verify
counters/minDb/init cost; a blur-gated comp reports mode=screenshot +
gate_reason=css_effect:filter; a forced verification failure reports
self_verify_fallback=true + fallback_reason=psnr.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/cli/src/commands/render.ts

@@ -1662,6 +1662,22 @@ function trackRenderMetrics(
     staticDedupSkipReason: perf?.staticDedup?.skipReason,
     staticDedupPredictedFrames: perf?.staticDedup?.predictedFrames,
     staticDedupReusedFrames: perf?.staticDedup?.reusedFrames,
+    deCaptureMode: perf?.drawElement?.mode,
+    deCompileGate: perf?.drawElement?.compileGate,
+    deClampReason: perf?.drawElement?.clampReason,
+    deGateReason: perf?.drawElement?.gateReason,
+    deWorkerEncode: perf?.drawElement?.workerEncode,
+    deVerifyArmed: perf?.drawElement?.verifyArmed,
+    deVerifyChecked: perf?.drawElement?.verifyChecked,
+    deVerifyMinDb: perf?.drawElement?.verifyMinDb,
+    deVerifyInitMs: perf?.drawElement?.verifyInitMs,
+    deSelfVerifyFallback: perf?.drawElement?.selfVerifyFallback,
+    deFallbackReason: perf?.drawElement?.fallbackReason,
+    deBlankSuspects: perf?.drawElement?.blankSuspects,
+    deBlankDeterministicAccepts: perf?.drawElement?.blankDeterministicAccepts,
+    deBlankRecaptures: perf?.drawElement?.blankRecaptures,
+    deBoundaryFrames: perf?.drawElement?.boundaryFrames,
+    deNcprFallbacks: perf?.drawElement?.ncprFallbacks,
     compositionDurationMs,
     compositionWidth: perf?.resolution.width,
     compositionHeight: perf?.resolution.height,