fix(scripts): complete fixture migration diagnostics

.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-07-26-remove-packed-session-fixture-migrator.md: d5f8ff65a38618c5f321f096921f7ce2b8af2d75
-2026-07-26-remove-packed-session-fixture-migrator.zh.md: d46e9e035709c26f59cb7f0a6908e38d0da08bbe
+2026-07-26-remove-packed-session-fixture-migrator.md: 0a29ef98828ac07d291392d637b0508937c9a9a6
+2026-07-26-remove-packed-session-fixture-migrator.zh.md: 64b994855a7e92d5b0922884b6c66df1b82b6d90

.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.md

@@ -12,7 +12,7 @@ Once every such branch is merged, closed, or already canonical, the write comman
 
 ## Proposal
 
-Remove the temporary `scripts/migrate-packed-session-fixtures.ts` CLI and the root `migrate:packed-session-fixtures` package command after a live inventory confirms that no open pull request still needs to convert session-format JSONL. Remove the transitional command links from the testing policy, the ACP snapshot README, and the implemented packed-row Agent Note in the same change.
+Remove the temporary `scripts/migrate-packed-session-fixtures.ts` CLI and the root `migrate:packed-session-fixtures` package command after a live inventory confirms that no open pull request still needs to convert session-format JSONL. Remove the transitional command links from the testing policy, the ACP snapshot README, and the implemented packed-row Agent Note in the same change; replace the command-specific remediation text in `scripts/session-fixture-layout.snapshot.ts` with command-independent canonical-layout guidance.
 
 Retain `scripts/session-fixture-layout.ts`, its unit tests, and `scripts/session-fixture-layout.snapshot.ts`. They define and enforce the permanent canonical layout; only the branch-facing writer is temporary.
 
@@ -29,7 +29,7 @@ Before removing the command, each affected branch merges the current `master`, r
 ## Acceptance criteria
 
 - A live open-PR inventory finds no branch with session-format JSONL changes that still depends on the temporary migration command.
-- The temporary CLI, root package command, and every branch-convergence link are absent; the permanent canonicalizer, unit tests, and snapshot check remain.
+- The temporary CLI, root package command, every branch-convergence link, and the command-specific gate diagnostic are absent; the permanent canonicalizer, unit tests, and snapshot check remain.
 - `pnpm run test:snapshot`, `pnpm run doc-sync`, lint, and whitespace validation pass without the temporary command.
 - Current documentation describes only the packed default and permanent canonical-layout enforcement.
 

.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.zh.md

@@ -12,7 +12,7 @@ Status: proposed
 
 ## 提案
 
-最新清单确认不再有任何开放 PR（Pull Request）需要转换会话格式 JSONL 后，移除临时 CLI `scripts/migrate-packed-session-fixtures.ts`，以及根包（package）提供的 `migrate:packed-session-fixtures` 命令。在同一变更中，移除测试政策、ACP 快照 README 和已实现打包行 Agent Note（agent 决策记录）中指向该过渡命令的链接。
+最新清单确认不再有任何开放 PR（Pull Request）需要转换会话格式 JSONL 后，移除临时 CLI `scripts/migrate-packed-session-fixtures.ts`，以及根包（package）提供的 `migrate:packed-session-fixtures` 命令。在同一变更中，移除测试政策、ACP 快照 README 和已实现打包行 Agent Note（agent 决策记录）中指向该过渡命令的链接，并将 `scripts/session-fixture-layout.snapshot.ts` 中仅适用于该命令的修复指引替换为与具体命令无关的规范布局指引。
 
 保留 `scripts/session-fixture-layout.ts`、其单元测试和 `scripts/session-fixture-layout.snapshot.ts`。它们定义并强制执行永久规范布局；只有面向分支的写入器是临时机制。
 
@@ -29,7 +29,7 @@ Status: proposed
 ## 验收标准
 
 - 最新开放 PR 清单未发现任何仍依赖临时迁移命令处理会话格式 JSONL 改动的分支。
-- 临时 CLI、根包命令与所有分支收敛链接均不存在；永久规范布局转换器、单元测试和快照检查仍然保留。
+- 临时 CLI、根包命令、所有分支收敛链接与仅适用于该命令的门禁诊断均不存在；永久规范布局转换器、单元测试和快照检查仍然保留。
 - `pnpm run test:snapshot`、`pnpm run doc-sync`、lint 和空白校验在没有临时命令的情况下通过。
 - 当前文档仅描述打包默认值和永久规范布局强制机制。