docs: rename core-data-structures/ to subsystems/

The folder is becoming the home of one-doc-per-subsystem pages (intro +
data structures + cordis services/events), so the name must describe the
whole contract, not just the type-vocabulary third of it. Mechanical
rename rebuilt on current master: every inbound Markdown link, generator
constant, website route, type-equiv manifest path, and spec expectation
moves together; the zh sides of the notes whose prose names the folder
are aligned (子系统) in the same change; touched bilingual pairs
re-recorded; translation-prompt snapshot re-recorded (its example embeds
development.md). Historical Agent Note slugs keep their dated
filenames.

docs/postmortem/0004-landlock-partial-notice-misclassified-child-failures.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 docs/postmortem/0004-landlock-partial-notice-misclassified-child-failures.md
-0004-landlock-partial-notice-misclassified-child-failures.md: db810fdc896f9734d1b581617838d72166f4efc9
-0004-landlock-partial-notice-misclassified-child-failures.zh.md: 4a31fb038c44b036e6a183040947295a47221967
+0004-landlock-partial-notice-misclassified-child-failures.md: ed59fa9d2b04623220a9bcd984fe6becdc619198
+0004-landlock-partial-notice-misclassified-child-failures.zh.md: 5cf3e4422a5b888553e12dfb97b8a26aad65e231

docs/postmortem/0004-landlock-partial-notice-misclassified-child-failures.md

@@ -40,7 +40,7 @@ Stderr remains an in-band attribution channel. A confined child can deliberately
 
 ## Guardrails added
 
-- [`RunnerFailureRule`](../core-data-structures/sandbox.md#wrapped-argv-and-classification-dialects) carries optional allowed exit codes, case-insensitive per-line fatal signatures, and case-insensitive exact informational-line exclusions.
+- [`RunnerFailureRule`](../subsystems/sandbox.md#wrapped-argv-and-classification-dialects) carries optional allowed exit codes, case-insensitive per-line fatal signatures, and case-insensitive exact informational-line exclusions.
 - [`dsh-sandbox-local`](../../packages/sandbox/sandbox-local/) maps Landlock to exit 125 plus a non-notice `landlock-run:` line while bwrap, Seatbelt, and custom runners remain signature-only.
 - [`dsh-bash-sandbox`](../../packages/bash/bash-sandbox/) directly spawns the provider argv, so a pre-start rejection uses the spawn-error channel instead of localized shell diagnostics. Settled foreground and background execution share one evidence-returning classifier; fatal evidence outranks denial, and foreground errors report the matched fatal line without changing captured stderr.
 - [`dsh-tool-fs-search`](../../packages/fs/tool-fs-search/) uses packaged ripgrep through `ctx.subprocess` and remains outside the sandboxed bash seam.

docs/postmortem/0004-landlock-partial-notice-misclassified-child-failures.zh.md

@@ -40,7 +40,7 @@ stderr 仍是带内归因通道。受限子进程可以故意复现 runner 的
 
 ## 已添加的防护措施
 
-- [`RunnerFailureRule`](../core-data-structures/sandbox.md#wrapped-argv-and-classification-dialects) 携带可选的允许退出码、不区分大小写的逐行致命签名，以及按不区分大小写的整行精确匹配排除的信息性行。
+- [`RunnerFailureRule`](../subsystems/sandbox.md#wrapped-argv-and-classification-dialects) 携带可选的允许退出码、不区分大小写的逐行致命签名，以及按不区分大小写的整行精确匹配排除的信息性行。
 - [`dsh-sandbox-local`](../../packages/sandbox/sandbox-local/) 把 Landlock 映射为退出码 125 加一行非通知的 `landlock-run:` 诊断，而 bwrap、Seatbelt 和自定义 runner 仍仅依据签名。
 - [`dsh-bash-sandbox`](../../packages/bash/bash-sandbox/) 直接 spawn 提供方 argv，因此启动前遭拒时使用 spawn 错误通道，而非本地化的 shell 诊断。已结算的前台与后台执行共用一个返回证据的分类器；致命证据优先于拒绝，前台错误会报告匹配到的致命行，同时保持捕获的 stderr 不变。
 - [`dsh-tool-fs-search`](../../packages/fs/tool-fs-search/) 通过 `ctx.subprocess` 运行打包的 ripgrep，并继续位于沙箱化 bash seam 之外。