PD-disagg docs: annotated corrections for e13391e contamination

Adds dated, non-destructive correction notes to the contaminated PD-vs-colo
artifacts after the producer-eviction bug (`evict_blocks(sent_block_ids)` on
`finished_sending`, deployed over the "fresh" pip vLLM by
`scripts/deploy_vllm_patches.sh`) was found and gated behind
`VLLM_EVICT_SENT_BLOCKS` (default off).

  PD_DISAGG_RESULTS.md  top CORRECTION banner + §6 RETRACTED marker.
                        §6 (session-affinity hot-pin) was an `e13391e`
                        artifact under controlled concurrency; §3 RR, §4
                        TPOT win, §5 D-pool ceiling, §5.1 consumer crash
                        stand.
  RESULTS_SUMMARY.md    §4 confirm+refine note: clean ablation confirms
                        the D-pool capacity thesis and adds regime-
                        dependence.
  pd_separation_analysis.md  scoped caution: thesis confirmed; flags
                        only reuse-dependent figures for cross-check
                        (this study used a different stack).
  figs/mb5/CORRECTION.md  flags mb5_producer_hotspot.png as retracted;
                        §3 RR and §5 D-pool figures stand.

RESULTS_SUMMARY.md

@@ -97,6 +97,18 @@ dash1 GPU 0 单 instance（无 kv_connector），chunked-prefill 默认开启，
 - MB1 + MB2 的合计 cost-benefit 在 phase isolation 维度上 PD-disagg 是赢的，**但这件事被容量天花板压倒**。
 - Paper §3.2 论证应该聚焦"D 池装不下"，MB1/MB2 数据用作 supporting context（per-request transfer charge 量化、phase isolation benefit 量化）而不是 main argument。
 
+> ✅ **2026-05-30 更新 — 干净栈三轴 ablation 证实本节、并加 regime 细化。**
+> 本节的容量论点（D 池容量天花板 / decode 减半）在修复 `e13391e` 污染后的 clean stack
+> 上**得到确认**：concurrency 轴 N=64 时 PD 倾覆，**producer APC 从 71% 崩到 1.4%、TPS −30%**，
+> 而 colo 线性 scale（Fig 3）。**细化**：PD 并非"在 agentic 上一律失败"——它在
+> *低负载 / decode-heavy / 低复用* 区间**赢** colo；真正失败的是 agentic corner（高复用 +
+> 短输出 + 大上下文 + 高并发）——静态 P:D split 无法同时给出复用所需的 producer 容量
+> *和* decode 容量，而 colo 的弹性池两者兼得。
+> **另注**：旧 MB5 文档（`PD_DISAGG_RESULTS.md` §6）"session-affinity 救不了 PD / PD 复用=0%"
+> 的结论是 `e13391e`（producer 每次 KV 传输后 evict prefix）的**污染产物，已撤回**；
+> 干净栈上 session 路由的 producer APC 与 colo 持平（71–82%）。
+> 图：[`figs/mb5_pd_ablation/`](figs/mb5_pd_ablation/)。
+
 ## 5. EAR 设计的实证状态（§4）
 
 | Pillar | 已实证 | 待实证 |