@@ -30,7 +30,7 @@
 - 新 head 即清;点名现 head 时 (b) 不起;条件满足由持有车道挂等复核标记或落交接行。
 - 逾 24 小时条件未满的 hold 列入分诊轮次记录(`check-owed-reviews.mjs` 标出)。
 - 复核记录 = 一条评论落 PR 或卡,席内与子代理同形;散文、dev 自评、`os-dev-report` 恒不算。
-- 同形 = `## Contract review` 题头、head sha 独占码段、①②③ 逐项、独立性对、PASS/FAIL。
+- 同形 = `## Contract review` 题头、`Head-sha:` 行独占码段、①②③ 逐项、独立性对、PASS/FAIL。
 - 同形含首行 `Served-tier:`:值写该面所定档的常量名 `CONTRACT_REVIEW_TIER` 或 `TIER_DEFAULT`;
   无此行不成裁决;模板 `node scripts/pm/record-recognisers.mjs --template`,申报面加 `--face declaration`。
 - 同形带 `Local-runs:` 行:`none` 或 `probe — REASON` 具名唯一探针;有行必校,缺行旧记录不改判。
 
@@ -12641,9 +12641,21 @@ export const H51_SHA_SPAN = /`([0-9a-fA-F]{7,40})`/g;
  * The `Head-sha:` key line — the ONE place a contract-review record names the
  * head it reviewed.
  *
- * The key half is `record-recognisers.mjs`'s `keyLineRegex` convention, spelled
- * here because that file imports this one: optional blockquote, bullet, bold
- * and backticks around the key, then the colon. The VALUE is a hex code span of
+ * The key half is `record-recognisers.mjs`'s `keyLineRegex` convention WITHOUT
+ * its two positional tolerances, spelled here because that file imports this
+ * one: bold and backticks around the key are tolerated, then the colon. ⛔ A
+ * leading blockquote or list bullet is NOT — `keyLineRegex` admits both for
+ * `Served-tier:`, `Reviewed-by:` and `Local-runs:`, whose values describe the
+ * record itself, but this line decides WHICH HEAD a PASS clears, and a quoted
+ * or bulleted `Head-sha:` line is one the author CITED rather than wrote (a
+ * review quoting the seat's hand-off, a record quoting an earlier record), so
+ * a reader that took it read a quoted sha as reviewed. The key may be indented
+ * by at most three spaces, CommonMark's limit before a line becomes an
+ * INDENTED CODE BLOCK: four spaces or a tab render the line as code, which is
+ * a quotation too, so the regex refuses them. `contractReviewHeadSha`
+ * adds the two positional rules a single-line regex cannot carry: the line
+ * sits BELOW the record's own UNQUOTED `## Contract review` heading and
+ * outside any fenced code block. The VALUE is a hex code span of
  * its OWN — the shape `--template` prints — and it is the FIRST thing after the
  * colon (spaces and bold may precede it, ⛔ nothing else); what follows the span
  * on that line is prose and decides nothing. A key folded into the span with
@@ -12652,24 +12664,75 @@ export const H51_SHA_SPAN = /`([0-9a-fA-F]{7,40})`/g;
  * decoration and the value then opens with hex rather than a backtick, so the
  * record names no head — the accept set stays exactly one spelling. A bare hex
  * value with no span, a lowercase key and a span below the floor name no head
- * either; the repair for every one of them is on the WRITE side.
+ * either; the repair for every one of them is on the WRITE side, where
+ * `post-stamped.mjs` refuses a record carrying a `Head-sha` key this reader
+ * cannot read BEFORE the write.
  */
 export const CONTRACT_REVIEW_HEAD_SHA_LINE = new RegExp(
-  `^[ \\t]*(?:>[ \\t]*)?(?:[-*][ \\t]+)?(?:\\*\\*)?\`?Head-sha\`?(?:\\*\\*)?[ \\t]*:(?:[ \\t]|\\*\\*)*${H51_SHA_SPAN.source}`,
+  `^[ ]{0,3}(?:\\*\\*)?\`?Head-sha\`?(?:\\*\\*)?[ \\t]*:(?:[ \\t]|\\*\\*)*${H51_SHA_SPAN.source}`,
 );
 
 /**
- * The head a contract-review record names — the span on its first `Head-sha:`
- * line, as written (case kept), or `null` when no line reads.
- *
- * First line wins, as `readServedTier` reads its key: a record is one comment
- * and names one head, and a later `Head-sha:` line (a quoted record, say) is
- * prose to this reader. Not judged against any head here — that is
- * `contractReviewHeadMatch`'s half — so a caller can also ask which head a
- * record is ABOUT, which the sentence a patrol prints needs.
+ * A fence line, as CommonMark spells one: three or more backticks or tildes at
+ * the line start (up to three spaces of indent). The run is captured because a
+ * fence CLOSES only on the same character with a run at least as long as the
+ * one that opened it: a shorter run, or the other character, is content of the
+ * open fence (a nested ``` inside a ```` block, a ~~~ inside a ``` block), and
+ * reading past either would read fenced content as the record's line. An
+ * unclosed fence runs to the end of the body, as it renders.
+ */
+const FENCE_LINE = /^[ ]{0,3}(`{3,}|~{3,})/;
+
+/**
+ * The head a contract-review record names — the span on the first `Head-sha:`
+ * line BELOW its `## Contract review` heading, as written (case kept), or
+ * `null` when no such line reads.
+ *
+ * Three positional rules, each measured in the review of the line-form reader
+ * (2026-10-30) as a way a sha the author never reviewed became the record's
+ * head: a `Head-sha:` line placed BEFORE the heading, a blockquoted or
+ * bulleted one, and one inside a fenced code block — each naming another head
+ * ABOVE the record's own line — read as the head, so the record was found at
+ * the cited head and absent at the real one. None is prose to a first-line
+ * reader, and all four shapes are what a quotation looks like. So: lines
+ * before the first UNQUOTED heading-marker line are skipped — the heading is
+ * read with `CONTRACT_REVIEW_HEADING_MARKER`, but a blockquoted heading opens
+ * nothing here, because a fully quoted record (heading, head line and
+ * signature all under `>`) followed by a plain line opening `Head-sha:` would
+ * otherwise hand the quoted record's signature to the plain line's head; the
+ * locator still finds such a comment as a record, and it then names no head.
+ * A fenced line is skipped, fence boundaries included, with the fence closed
+ * only by its own character and length (`FENCE_LINE`); and
+ * `CONTRACT_REVIEW_HEAD_SHA_LINE` itself refuses the blockquote, the bullet
+ * and an indented-code line. Among the lines that remain, the FIRST wins, as
+ * `readServedTier` reads its key: a record is one comment and names one head,
+ * and a later `Head-sha:` line (a quoted record, say) is prose to this reader.
+ * Measured on the 709 records with a line-initial heading posted to this
+ * repository in the week to 2026-10-30: 707 carry the line plain and below
+ * the heading, 2 carry no `Head-sha` key at all (the two retired-dialect
+ * records), and 0 read differently under these rules than under the
+ * first-line-anywhere reader they replace.
+ *
+ * Not judged against any head here — that is `contractReviewHeadMatch`'s half
+ * — so a caller can also ask which head a record is ABOUT, which the sentence
+ * a patrol prints needs, and which `post-stamped.mjs` asks before it writes a
+ * record: a body carrying a `Head-sha` key that reads `null` here is refused.
  */
 export function contractReviewHeadSha(body) {
+  let fence = null; // the OPEN fence — its character and run length — or null outside one
+  let belowHeading = false;
   for (const line of String(body ?? '').split(/\r?\n/)) {
+    const f = FENCE_LINE.exec(line);
+    if (f !== null) {
+      if (fence === null) fence = { ch: f[1][0], len: f[1].length };
+      else if (f[1][0] === fence.ch && f[1].length >= fence.len) fence = null;
+      continue;
+    }
+    if (fence !== null) continue;
+    if (!belowHeading) {
+      belowHeading = CONTRACT_REVIEW_HEADING_MARKER.test(line) && !/^\s*>/.test(line);
+      continue;
+    }
     const m = CONTRACT_REVIEW_HEAD_SHA_LINE.exec(line);
     if (m) return m[1];
   }
@@ -33452,8 +33515,32 @@ Doubles as the fire's **write self-check** (step 0). \`201\` is not the reading.
   const DELTA51 = RECORD51(OLDHEAD51, `\nThe PR has since moved to \`${HEAD51.slice(0, 8)}\` (seat comment 6515952505); this record judges \`${OLDHEAD51.slice(0, 8)}\` alone. Runs cancelled by the push of \`${HEAD51.slice(0, 8)}\`; landing waits on \`${HEAD51}\`.\n`);
   t('⛔ record reader: a delta record on head A whose PROSE names head B is NO review of B', latestContractReviewOnHead([cm51(1, DELTA51, T51)], HEAD51), null);
   t('⭐ record reader: …and IS the review of A — the `Head-sha:` line alone decides', latestContractReviewOnHead([cm51(1, DELTA51, T51)], OLDHEAD51)?.sha, OLDHEAD51);
-  t('record reader: `contractReviewHeadSha` reads the line\'s span — the first line wins, decoration and a trailing span tolerated', [contractReviewHeadSha(DELTA51), contractReviewHeadSha(`- **Head-sha:** \`${HEAD51}\` (moved to \`${OLDHEAD51}\`)\nHead-sha: \`${OLDHEAD51}\``), contractReviewHeadSha(`> Head-sha: \`${HEAD51}\``)].join(), [OLDHEAD51, HEAD51, HEAD51].join());
-  t('⛔ record reader: the key folded INTO the span, a bare hex value, a lowercase key and a sub-floor span name no head', [contractReviewHeadSha(`\`Head-sha: ${HEAD51}\``), contractReviewHeadSha(`Head-sha: ${HEAD51}`), contractReviewHeadSha(`head-sha: \`${HEAD51}\``), contractReviewHeadSha('Head-sha: `ba3d95`')].join('|'), '|||');
+  const UNDER51 = (...lines) => ['## Contract review', ...lines].join('\n');
+  t('record reader: `contractReviewHeadSha` reads the line\'s span — the first line BELOW the heading wins; bold or backticks on the key, a trailing span and up to three spaces of indent are tolerated', [contractReviewHeadSha(DELTA51), contractReviewHeadSha(UNDER51(`**Head-sha:** \`${HEAD51}\` (moved to \`${OLDHEAD51}\`)`, `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51(`\`Head-sha\`: \`${HEAD51}\``)), contractReviewHeadSha(UNDER51(`   Head-sha: \`${HEAD51}\``))].join(), [OLDHEAD51, HEAD51, HEAD51, HEAD51].join());
+  // ⛔ A BLOCKQUOTED heading opens no scope: a fully quoted signed record followed by a plain prose line opening
+  // `Head-sha:` would otherwise lend the quoted signature to the plain line's head (the locator still sees a record here,
+  // through the marker's `>` tolerance — it then names no head). Measured live: 0 of 709 records quote their heading.
+  const QUOTED_RECORD51 = `> ## Contract review\n> Head-sha: \`${OLDHEAD51}\`\n> Reviewed-by: \`session_01SEAT\`\n> **VERDICT: PASS**\n\nHead-sha: \`${HEAD51}\` is the head the PR has since moved to.`;
+  t('⛔ record reader: a QUOTED record followed by a plain line opening `Head-sha:` names no head — a blockquoted heading opens no scope, and nor does a quoted heading alone', [contractReviewHeadSha(QUOTED_RECORD51), contractReviewHeadSha(`> ## Contract review\nHead-sha: \`${HEAD51}\``), latestContractReviewOnHead([cm51(1, QUOTED_RECORD51, T51)], HEAD51)].join('|'), '||');
+  // ⛔ An INDENTED CODE BLOCK (four spaces or a tab) is a quotation too: skipped above the record's own line, nothing alone.
+  t('⛔ record reader: a `Head-sha:` line indented as CODE — four spaces or a tab — above the record\'s own is skipped, and alone names no head', [contractReviewHeadSha(UNDER51(`    Head-sha: \`${HEAD51}\``, `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51(`\tHead-sha: \`${HEAD51}\``, `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51(`    Head-sha: \`${HEAD51}\``)), contractReviewHeadSha(UNDER51(`\tHead-sha: \`${HEAD51}\``))].join('|'), [OLDHEAD51, OLDHEAD51, '', ''].join('|'));
+  // ⛔ A fence closes only on its OWN character and a run at least as long: a nested ``` inside ````, a ~~~ inside ```,
+  // are content, and a `Head-sha:` line between them stays fenced; a longer closing run closes; a never-closed one runs out.
+  t('⛔ record reader: a nested or mismatched fence does not close the open one — the `Head-sha:` line inside stays fenced; a longer run closes; an unmatched run leaves it open to the end', [contractReviewHeadSha(UNDER51('````', '```', `Head-sha: \`${HEAD51}\``, '```', '````', `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51('```', '~~~', `Head-sha: \`${HEAD51}\``, '```', `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51('```', `Head-sha: \`${HEAD51}\``, '`````', `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(UNDER51('```', '~~~', `Head-sha: \`${HEAD51}\``, '~~~', `Head-sha: \`${OLDHEAD51}\``))].join('|'), [OLDHEAD51, OLDHEAD51, OLDHEAD51, ''].join('|'));
+  t('⛔ record reader: the key folded INTO the span, a bare hex value, a lowercase key and a sub-floor span name no head', [contractReviewHeadSha(UNDER51(`\`Head-sha: ${HEAD51}\``)), contractReviewHeadSha(UNDER51(`Head-sha: ${HEAD51}`)), contractReviewHeadSha(UNDER51(`head-sha: \`${HEAD51}\``)), contractReviewHeadSha(UNDER51('Head-sha: `ba3d95`'))].join('|'), '|||');
+  // ⛔ The shapes the review of the line-form reader probed (2026-10-30): a `Head-sha:` line naming ANOTHER head above the
+  // record's own — placed before the heading, blockquoted, bulleted or fenced. Each is a citation, not the record's line,
+  // so the record reads ABSENT at the cited head and FOUND at its own; the first-line-anywhere reader read all four as cited.
+  const CITED51 = {
+    preHeading: `Head-sha: \`${HEAD51}\`\n\n${RECORD51(OLDHEAD51)}`,
+    quoted: UNDER51('', `> Head-sha: \`${HEAD51}\``, `Head-sha: \`${OLDHEAD51}\``, '**VERDICT: PASS**'),
+    bulleted: UNDER51('', `- Head-sha: \`${HEAD51}\``, `Head-sha: \`${OLDHEAD51}\``, '**VERDICT: PASS**'),
+    fenced: UNDER51('', '```', `Head-sha: \`${HEAD51}\``, '```', `Head-sha: \`${OLDHEAD51}\``, '**VERDICT: PASS**'),
+  };
+  t('⛔ record reader: a `Head-sha:` line before the heading, blockquoted, bulleted or fenced — naming another head ABOVE the record\'s own — is NO review of that head', Object.values(CITED51).map((body) => latestContractReviewOnHead([cm51(1, body, T51)], HEAD51)).join('|'), '|||');
+  t('⭐ record reader: …and each IS the review of the head its own line names — the cited line is prose to the reader', Object.values(CITED51).map((body) => latestContractReviewOnHead([cm51(1, body, T51)], OLDHEAD51)?.sha).join(), [OLDHEAD51, OLDHEAD51, OLDHEAD51, OLDHEAD51].join());
+  t('⛔ record reader: a quoted, bulleted or fenced line ALONE names no head, nor does a line with NO heading above it, nor one inside an unclosed fence', [contractReviewHeadSha(UNDER51(`> Head-sha: \`${HEAD51}\``)), contractReviewHeadSha(UNDER51(`- **Head-sha:** \`${HEAD51}\``)), contractReviewHeadSha(UNDER51('```md', `Head-sha: \`${HEAD51}\``, '```')), contractReviewHeadSha(`Head-sha: \`${HEAD51}\``), contractReviewHeadSha(UNDER51('```', `Head-sha: \`${HEAD51}\``))].join('|'), '||||');
+  t('record reader: a tilde fence is a fence too, and CRLF line endings read', [contractReviewHeadSha(UNDER51('~~~', `Head-sha: \`${HEAD51}\``, '~~~', `Head-sha: \`${OLDHEAD51}\``)), contractReviewHeadSha(`## Contract review\r\nHead-sha: \`${HEAD51}\`\r\n`)].join(), [OLDHEAD51, HEAD51].join());
   t('⛔ record reader: the RETIRED dialects — head in the heading (two spellings), on the first body line, in an adoption sentence — name no head', [DIALECT_A, DIALECT_B, DIALECT_C, DIALECT_D].map((d) => latestContractReviewOnHead([cm51(1, d(HEAD51), T51)], HEAD51)).join('|'), '|||');
 
   // -- H54 — a `[Decision]`-titled card sitting in the DISPATCH pool (#16688) -