diff --git a/.claude/skills/pm-dispatch/references/platform-readings.md b/.claude/skills/pm-dispatch/references/platform-readings.md
index 2b5af1e11b2..b60ca41820b 100644
--- a/.claude/skills/pm-dispatch/references/platform-readings.md
+++ b/.claude/skills/pm-dispatch/references/platform-readings.md
@@ -247,6 +247,7 @@
 - `list_issues` 永不返回 assignees:`fields` 枚举无此成员,不传也没有。
 - 已认领卡与空闲卡响应逐字节相同,清单只是候选名单 ⇒ 认领前必须过完整 `issue_read`。
 - `comments` 计数会多读:实测 1 而列表与 timeline 双 0 ⇒ 线程空否读那两条,⛔ 不读计数。
+- `comments` 与枚举不等是瞬态旗:计数收敛后记录已失而差值归零 ⇒ ⛔ 不作唯一防线。
 - 可指派性是仓+账号属性且会话中可变:`GET /repos/{o}/{r}/assignees/USER` 204/404,指派后回读。
 - MCP `issue_read` 的 body 实体转义是纯读侧伪影,撇号与引号与尖括号成数字实体,comments 原样。
 - 存储体是明文,先解码实体再写回往返安全;腐蚀 body 的恰是把转义读数原样回写。
@@ -340,16 +341,18 @@
 - 写侧 · PR 正文:尾部横线与其后的署名页脚一并被吃,而写调用照报成功。
 - 去掉横线只写页脚则原样存活;评论不受影响,两种拼法都活。
 - ⇒ 失效既依拼写又依载体:评论里验过页脚对 PR 正文什么都没证明。
-- ⇒ PR 正文页脚不带前置横线,且写后回读正文 —— 那是唯一检测手段;评论两形皆可。
+- ⇒ 处方按动作分裂:建侧送全块(横线加页脚),改侧不送页脚;⛔ 无一形两动作通吃。
 - MCP `update_pull_request` 包装器删掉 PR 正文的页脚块;该通道锁 1 已拒,读作历史。
-- 裸 REST `PATCH /pulls` 追加一个裸页脚并保留既有 session-URL 页脚,差恰 58 字节。
+- 改侧 · 裸 REST `PATCH /pulls` 恒追加一条裸页脚并保留既有页脚,差恰 58 字节,与尾部无关。
+- 尾部已是 `---` 加页脚块也照追加,重送复现 ⇒ 建侧的不追加判据 ⛔ 不外推到改侧。
 - 同路送无页脚正文存回恰一条(平台裸形)⇒ 该格处方是不送页脚,⛔ 不是不重送正文。
 - 页脚两拼写:裸版与 session-URL 版都要剥,漏剥的卡在正文中段,而 58 字节差照常。
 - ⇒ 代价是归属:裸形无 session id,按此剥净的 PR 正文不载明哪个会话写的;另置见 AGENTS.md。
 - 第四形:建 PR 两通道同判 —— 送出体尾部不是 `---` 加页脚块时,追加一条同形页脚。
-- 该追加带前置横线、恰 90 字节,送出体是存储体的严格前缀。
+- 该追加是横线加一条 session-URL 形页脚,送出体是存储体的严格前缀;字节数非常量(90/91)。
 - 尾部已是该块则一字不追加,两通道各实测两向 ⇒ 建侧通道不是变量,判据是送出体尾部。
-- ⛔ 无受控对照(同通道只差该块两送)⇒ 是拟合不是定论,⛔ 不外推到别的动作。
+- 受控对照已补齐:同通道同动作只差该块两送,尾部为无横线页脚时照追加成两条。
+- ⛔ 该对照只在裸 REST 建侧成立,MCP 建侧同一输入未测 ⇒ ⛔ 不外推到该通道。
 - 调用不带 `body` 参数则页脚状态不动:`draft` 或 `title` 单字段更新既不删也不合成。
 - 正文把 harness 两行块叠在页脚之上,存回是三条署名块;单块形态才复现成一条。
 - ⇒ 形态随动作与送出体尾部变,改侧还随通道变;⛔ 不由任一条推其余,写后必回读。
diff --git a/scripts/pm/check-skill-line-ratchet.mjs b/scripts/pm/check-skill-line-ratchet.mjs
index ccd21fa35c8..d79bbd0e5ff 100644
--- a/scripts/pm/check-skill-line-ratchet.mjs
+++ b/scripts/pm/check-skill-line-ratchet.mjs
@@ -1011,7 +1011,47 @@ export const CEILINGS = new Map([
   // contended it is, the detached prescription unchanged.
   // Nothing else was paid in place: re-wrap funding is refused per the
   // 2026-08-17 rule in any case. Landed count, headroom 0, same convention.
-  ['.claude/skills/pm-dispatch/references/platform-readings.md', 466],
+  // Raised 466 → 469 by the EIGHTEENTH readings increment, again under the
+  // STANDING one-file exception quoted above rather than a fresh decision card,
+  // and again recorded as a `ruledRaises` record citing it. Its carrier card
+  // named a MEASURABLE unknown — the missing half of a controlled contrast this
+  // map itself declares absent — and the probe was the raising PR's own body:
+  // composed to end in the signature line with NO rule line above it, sent once
+  // through a bare `POST /pulls`, then read back (11,689 bytes sent and one
+  // signature line, 11,780 stored and two, the send a strict PREFIX of the
+  // store). Spent at ONE line per deduplicated reading: on the PATCH channel the
+  // append is UNCONDITIONAL, so a sent tail that IS the rule-plus-signature
+  // block — the very shape the create side leaves alone — is appended to
+  // anyway, reproduced on a second send, and the create-side criterion does not
+  // carry to it (+1); a thread's count-versus-enumeration discrepancy is a
+  // TRANSIENT flag, because the count converges on the enumeration and after it
+  // converges the records are gone and the difference is zero, so that
+  // discriminant cannot be the only defence (+1); and the controlled contrast
+  // now holds only on the bare-REST create channel, the MCP create channel's
+  // same input being unmeasured, so the conclusion is not carried there (+1) =
+  // +3 exactly. Candidates 5 / landed 3 / already present 1 / refused 1 — the
+  // already-present one is that channel's operational cost, carried by
+  // 「⇒ 该格处方是不送页脚」 and by the attribution row beside it; the refusal is a
+  // residual row whose first clause restated its neighbour's own conclusion
+  // 「判据是送出体尾部」 and whose second clause named the comment surface and
+  // the patch cell's other input as uncontrolled when both are in fact measured.
+  // Absence was measured per row with a lit control: `收敛` reads 0 in this file
+  // against `计数` at 9, `瞬态` hits only the `unstable` and PR-files rows, and
+  // `updated_at` reads 0.
+  //
+  // THREE corrections are paid in place and buy nothing — a rewrite is not a
+  // raise. The prescription row 「PR 正文页脚不带前置横线」, whose spelling is
+  // precisely what TRIGGERS the create-side append, is split per action. The
+  // PATCH row is re-stated as a RULE instead of one of two rows of inputs. And
+  // the append-size row's 「恰 90 字节」 becomes 「字节数非常量(90/91)」:
+  // this increment's send measured 91 bytes on a body with no trailing newline,
+  // the appended line being the session-URL spelling, which the row now NAMES
+  // instead of leaving it to be inferred from a constant that is not one. ⛔ No
+  // cause is asserted for the spread — one reading each, and no controlled
+  // contrast on the trailing newline or on session-id length.
+  // Nothing else was paid in place: re-wrap funding is refused per the
+  // 2026-08-17 rule in any case. Landed count, headroom 0, same convention.
+  ['.claude/skills/pm-dispatch/references/platform-readings.md', 469],
   // Per-operation REST/GraphQL/git channel mapping — which fleet operation has
   // a REST twin (each row executed in a real session, provenance date carried
   // per row), the handful that are GraphQL-only, and the queue-routing
@@ -1736,6 +1776,23 @@ export const CROSS_FILE_MOVES = new Map([
           date: '2026-09-15',
           delta: 1,
         },
+        {
+          // The EIGHTEENTH increment, under the same STANDING exception — the
+          // same words again, for the same reason: a record that quotes no
+          // ruling is RED and each record stands alone. The +3 is accounted for
+          // line by line beside this entry's ceiling above; the exception's
+          // conditions (per-item verification and the candidate / landed /
+          // already-present / refused counts) are carried by the raising PR's
+          // body and the seat's ACCEPT.
+          ruling:
+            'the standing one-file exception for'
+            + ' `.claude/skills/pm-dispatch/references/platform-readings.md` — pm-dispatch'
+            + ' SKILL.md, verbatim and untranslated: 「唯一例外：`platform-readings.md`'
+            + ' 增量抬上限到落地行数，免决策卡，记 `ruledRaises` 引常设裁决。条件：席位验收评论'
+            + '逐条核实、去重计数（候选/落地/已有/拒收）、一事一行、不计重排」',
+          date: '2026-09-18',
+          delta: 3,
+        },
       ],
       sources: [
         ['.claude/skills/pm-dispatch/references/lanes/cli.md', 35],