fix(release): make publication retry, space out, and skip what landed

A landlock publication failed with `E409 Failed to save packument` on the
second of three packages. The registry answers a write it could not commit that
way, and publishing several packages back to back is what provokes it.

Neither publish path could recover. The native sequence published from a shell
loop of bare `npm publish` calls: no retry, and no way to resume, because the
registry rejects a repeat of an existing version permanently — so a failure
partway through left the release stuck. publish.ts skipped versions already
present, which made a re-run safe, but had no retry either.

Both paths now attempt a tarball up to four times, space writes at least two
seconds apart, and back off 2s/4s/8s between attempts. Every retry re-reads the
registry first, because a reported failure can answer a write that landed
anyway: a version that now exists with this tarball's integrity counts as
published rather than as one to place again. That same re-read is what turns a
mid-run `E403 cannot publish over the previously published versions` into a
skip when the bytes match, and leaves it a hard failure when they do not.

The native sequence gets the registry comparison publish.ts already had, through
its own script rather than shared code — the two sequences keep separate
publication paths. Its publish job now checks out the repository, which the
shell loop did not need.

Verified against a scripted registry: a clean publish, one E409 then success, an
E409 whose write landed anyway, E409 on every attempt (fails after four), and a
version already present with matching integrity (publishes nothing).

.agents/notes/implemented/process/2026-08-10-npm-release-sequences.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 .agents/notes/implemented/process/2026-08-10-npm-release-sequences.md
-2026-08-10-npm-release-sequences.md: e8138aef923e201cc0883232f48ce6921452ca00
-2026-08-10-npm-release-sequences.zh.md: 7ce9fa01dbe10cbdae5585f64392d0ca6a9fb868
+2026-08-10-npm-release-sequences.md: e74a4ac8f2aadd8665ec0db198c6a317a0c201bc
+2026-08-10-npm-release-sequences.zh.md: e152163976f945224f2524fccd7f831ba98e8161

.agents/notes/implemented/process/2026-08-10-npm-release-sequences.md

@@ -70,6 +70,10 @@ Publication runs only from GitHub Actions; there is no local publication path. P
 
 The third state catches code that changed without a version bump. The first two provide idempotence — re-running publish over one artifact republishes nothing and needs no manual selection of packages. The same rule resolves the tension between one vendor release carrying several tags and a workflow that can only run from one ref: the workflow never infers which packages to publish from the tag it ran from.
 
+All three sequences decide this way, including the native one: it publishes through its own script rather than a shell loop, because a loop of bare `npm publish` calls cannot be retried — the registry answers a repeat of an existing version permanently, so one failure partway through left no way forward.
+
+Two registry behaviours shape how a publish is attempted. Writes are spaced by at least two seconds and retried with a backoff, because publishing several packages back to back outruns the registry's own processing and earns `E409 Failed to save packument`. And every retry re-reads the registry first: a reported failure can answer a write that landed anyway, so a version that now exists with this tarball's integrity counts as published rather than as a version to place again.
+
 ### Workspace-internal references use the `workspace:` protocol
 
 Every reference to a workspace member uses `workspace:^`, so `pnpm pack` substitutes a range matching the target version: sibling `peerDependencies` follow the family version, and a reference to a vendored package follows that package's own line. The Landlock platform packages keep `workspace:*`, which publishes the exact version, because a platform package and its entry must agree exactly.

.agents/notes/implemented/process/2026-08-10-npm-release-sequences.zh.md

@@ -70,6 +70,10 @@ tag 只是 commit 指针，不是发布成功的证明。bump 会向 registry
 
 第三态拦住「改了代码却没 bump 版本」。前两态给出幂等——同一个 artifact 重跑 publish 不会重复发布，也不需要人工挑拣包。同一条规则还解决了「一次 vendor 发布携带多个 tag，而 workflow 只能从一个 ref 触发」的矛盾：workflow 从不从触发它的 tag 去推断该发哪些包。
 
+三条序列都按这套判定，native 也在内：它通过自己的脚本发布，而不是 shell 循环——一串裸 `npm publish` 无法重试，registry 对「重发已存在的版本」的回答是永久失败，因此中途失败一次就没有前路了。
+
+registry 的两个行为决定了「怎么尝试一次发布」。写入之间至少间隔两秒并带退避重试，因为连续背靠背发多个包会超出 registry 自身的处理速度，换来 `E409 Failed to save packument`。而每次重试都先重查 registry：报出来的失败可能对应一次其实已经落地的写入，所以「该版本现在存在且 integrity 与本 tarball 相同」算作已发布，而不是又一个待放置的版本。
+
 ### workspace 内部引用走 `workspace:` 协议
 
 所有指向 workspace 成员的引用都用 `workspace:^`，由 `pnpm pack` 替换成匹配目标版本的范围：兄弟包的 `peerDependencies` 跟随族版本，指向 vendored 包的引用跟随那个包自己的版本线。Landlock 平台包保留 `workspace:*`（发布成精确版本），因为平台包与它的入口必须版本完全一致。