fix(spec): repoint the query.searchFields liveness row at engine-find.ts#expandSearchOnAst (#30368)

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Fixes #30367
Refs #30053

Clause-②: no
Metadata-protocol: none

## 维护者速读

- 改了什么：`packages/spec/liveness/query.json` 里 `searchFields` 一行的证据第一段从
`engine.ts#expandSearchOnAst` 改指 `engine-find.ts#expandSearchOnAst`，note
补一句为什么改；加一个 `@objectstack/spec` patch changeset（liveness 目录随包发布）。
- 为什么改：#30341（#30053 第一片）把 `engine.ts` 里最后一处提到 `searchFields` 的私有
docblock 搬进了手写模块，`check:liveness` 要求被引文件提到键名，于是 main 红了（Spec Liveness
Check 不是必需检查，所以 #30341 照样合并了；Lint UI 会跑它）。函数体从 codemod 拆分起就在
`engine-find.ts`，那里提到 `searchFields`。没有在 `engine.ts` 里硬加一处提及。
- 风险与回滚：只改台账证据文本，无运行时改动；回滚就是 revert。
- 两分钟验证：`pnpm --filter @objectstack/spec check:liveness`，退出码 0。

## What changes

- `packages/spec/liveness/query.json`, row `query.searchFields`: the
evidence's first leg cites
`packages/objectql/src/engine-find.ts#expandSearchOnAst` (was
`engine.ts#expandSearchOnAst`). The note gains one sentence dated
2026-11-05 on why. The other two legs are unchanged.
- `.changeset/30053-liveness-search-fields-repoint.md`: `patch` on
`@objectstack/spec`, because `liveness/` ships in the package's `files`.

## Why

`check:liveness` requires every cited file to name the property it is
evidence for. On `main` `f672e0dc` it fails: `query/searchFields →
packages/objectql/src/engine.ts`. The first slice of the hand-series
docblock move (#30341) moved the private docblock that named
`$searchFields` out of `engine.ts`, and nothing else there names the
key. The hand-off the row describes has lived in `engine-find.ts`
(`FindFacet.expandSearchOnAst`) since the `engine.ts` codemod split, and
that file names `searchFields`.

## Verification

- Reproduced first: `pnpm --filter @objectstack/spec check:liveness` on
the #30341 head exits 1 with exactly that one citation.
- On this head: exit 0, 0 failures. That run covers every ledger
(`field.json` included): no other row cites a file that no longer names
its key.
- The diff against `main` is these 2 files (+13 / −2). The branch is the
designated thread branch, which carried #30341; `main` is merged in, so
no earlier commit's content is in the diff.
- Gates: `dispatch-gates --commands` derives 55 for this diff; 43 had
run when this PR opened, all exit 0. The rest go to the seat with the
hand-back.

## Human Minimum

- [x] 1. Schemas start as Zod; `packages/spec` holds no runtime logic.
(a ledger row only)
- [x] 2. Every name I added uses the casing for its kind.
- [x] 3. No formatter ran.
- [x] 4. One issue, one branch off an up-to-date `main`, one pull
request. (the designated thread branch with `main` merged in)
- [x] 5. A change that publishes carries a changeset, and both
declaration lines are filled in here and in the changeset.
- [x] 6. `packages/spec` touched: its generated artifacts are
regenerated and committed. (a liveness row; nothing generated reads it)
- [x] 7. No hand edits to `content/docs/references/`,
`packages/*/CHANGELOG.md` or `content/docs/releases/`.
- [x] 8. Title, body and comments are in English.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01Utp6CYHBS7P5hkUQrNHkHZ

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: objectstack-fleet[bot] <332303061+objectstack-fleet[bot]@users.noreply.github.com>

Author: objectstack-fleet[bot]

.changeset/30053-liveness-search-fields-repoint.md

@@ -0,0 +1,11 @@
+---
+'@objectstack/spec': patch
+---
+
+fix(spec): the liveness ledger's `query.searchFields` row cites `engine-find.ts#expandSearchOnAst`, where the hand-off lives, so `check:liveness` is green again
+
+Clause-②: no
+Metadata-protocol: none
+
+- The row cited `engine.ts#expandSearchOnAst`. The body has lived in `engine-find.ts` since the `engine.ts` codemod split, and the last mention of `searchFields` in `engine.ts`, a private docblock, moved out with the first slice of the hand-series docblock move, so the check found no mention of the key in the cited file.
+- Nothing to do on upgrade: only the shipped `liveness/query.json` evidence text changes.

packages/spec/liveness/query.json

@@ -29,8 +29,8 @@
     "searchFields": {
       "status": "live",
       "verifiedAt": "2026-08-28",
-      "note": "Formally declared by #3899 (ADR-0061 P1, 'formalize $searchFields'): the per-query narrowing override the executor has served since the ADR landed — server-intersected with the object's allowed searchable set, can only narrow, never widen. The schema-side declaration caught up with the executor when #3899's entry validation started rejecting bodies the schema did not describe. 2026-08-28: RE-ANCHORED (commit 8cb96ec41) and REPOINTED — `engine.ts:2893-2898` had rotted onto `const row = rows[index];`, and the `search-filter.ts` leg was PATH-ONLY. Both halves of a two-hop claim (`requestedFields hand-off` → `resolveSearchFields`) were unfalsifiable in different ways: one bounded to a line that had stopped meaning anything, the other bounded to nothing. Re-closed by hand against 93ea19bca.",
-      "evidence": "packages/objectql/src/engine.ts#expandSearchOnAst (the hand-off — the requested fields ride into the expansion); packages/objectql/src/search-filter.ts#resolveSearchFields (the intersection with the object's allowed searchable set: narrows only, never widens); proof showcase-search.dogfood.test.ts + search-conformance.ledger.ts row search-fields-override"
+      "note": "Formally declared by #3899 (ADR-0061 P1, 'formalize $searchFields'): the per-query narrowing override the executor has served since the ADR landed — server-intersected with the object's allowed searchable set, can only narrow, never widen. The schema-side declaration caught up with the executor when #3899's entry validation started rejecting bodies the schema did not describe. 2026-08-28: RE-ANCHORED (commit 8cb96ec41) and REPOINTED — `engine.ts:2893-2898` had rotted onto `const row = rows[index];`, and the `search-filter.ts` leg was PATH-ONLY. Both halves of a two-hop claim (`requestedFields hand-off` → `resolveSearchFields`) were unfalsifiable in different ways: one bounded to a line that had stopped meaning anything, the other bounded to nothing. Re-closed by hand against 93ea19bca. 2026-11-05: REPOINTED to `engine-find.ts#expandSearchOnAst`, where the body has lived since the engine.ts codemod split: the first slice of #30053 moved the private docblock that named `$searchFields` out of engine.ts, which no longer names the key.",
+      "evidence": "packages/objectql/src/engine-find.ts#expandSearchOnAst (the hand-off — the requested fields ride into the expansion); packages/objectql/src/search-filter.ts#resolveSearchFields (the intersection with the object's allowed searchable set: narrows only, never widens); proof showcase-search.dogfood.test.ts + search-conformance.ledger.ts row search-fields-override"
     },
     "orderBy": {
       "status": "live",