Settle the local gates for the model-selector round

- ui-model README pair (short-form Model Experience + audited registry
  entry + Known Limitations), recorded in the pairing manifest
- llm-deepseek README pair rebased onto master's version with this PR's
  real deltas (friendly names, 256k, selector consumers) on both sides;
  runtime/ui-conversation READMEs revert to master (their sections
  documented the removed Session state machine and control slot)
- config catalog regenerated for the ui-model roster row
- ModelDirectory.store JSDoc; ui-model files join the TODO(gui) coverage
  deferral lane beside their ui-command/ui-slash siblings

packages/client/ui-model/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# 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
+README.md: fa972e01579a5608b968e13010bd5224f38bdfbc
+README.zh.md: b1a4980dc74e4cb0a4d6607dabae58d37bb18792

packages/client/ui-model/README.md

@@ -0,0 +1,21 @@
+# @deepseek-ai/dsh-client-ui-model
+
+English | [中文](README.zh.md)
+
+Model selection plugin, browser half: TWO entries over ONE per-session directory owned by `ModelService` (`ctx.models`). The `/model` popupSelect contribution (registered through `ctx.command`) and the composer's named `conversation.input.model` seat (a compact trigger + upward provider-grouped menu, figma 313:14108's ToggleButton chrome) both load the session's advisory directory through `session.models` and submit through `session.selectModel` via the same `ModelDirectory` instance — the host-reported current target is the single fact both surfaces echo, so a switch made in either entry is what the other shows next. Directory loads and selections share a generation counter (an older response never overwrites a newer one); provider-local catalog failures list inline while usable groups stay selectable; whole-request and selection failures surface on each entry's own retry face (the popup shell's error/retry, the seat menu's inline error) without forking the state. Directories are per-session, resolved lazily through `ctx.models.directoryFor(sessionId)`, and disposed with the session scope.
+
+The `/client` export surface is the plugin body (`apply`/`inject`), `ModelService`, `ModelDirectory` with its state shape, and the seat's injected face type.
+
+## Model Experience
+
+Indirectly, through the `session.selectModel` RPC both entries submit: the host snapshots the selected provider/model pair at the next prompt-assembly boundary, so the following request routes (and stamps its prompt variables) with the chosen target while a running step keeps its assembled one — the directory, both menus, and every selection interaction stay client-side and never enter the session log.
+
+#### KV Cache effect
+
+Switching the route can reduce or invalidate provider-side cache reuse for subsequent requests; the prompt prefix itself is untouched.
+
+## Known Limitations and Deferred Work
+
+- **No create-time selection** — both entries address an existing session's agent; there is no draft-phase model choice to fold into session creation (the seed order at the host's `targetFor` documents where such a tier would go).
+- **Directory names are presentation-only** — selection and persistence use provider/model ids; a provider whose catalog lookup fails lists as an unselectable failure row until reload.
+- **The seat shows no effort level** — the figma mock's `High` text has no wire concept behind it yet; the trigger renders the model name alone.

packages/client/ui-model/README.zh.md

@@ -0,0 +1,21 @@
+# @deepseek-ai/dsh-client-ui-model
+
+[English](README.md) | 中文
+
+模型选择插件（浏览器半侧）：**两个入口共用一份 per-session 目录**，由 `ModelService`（`ctx.models`）持有。`/model` popupSelect contribution（经 `ctx.command` 注册）与 composer 的具名 `conversation.input.model` 坑位（紧凑触发器 + 向上展开的按提供方分组菜单，视觉取 figma 313:14108 的 ToggleButton）都通过同一个 `ModelDirectory` 实例经 `session.models` 加载会话的建议目录、经 `session.selectModel` 提交——host 报告的 current target 是两个界面共同回显的唯一事实，在任一入口切换，另一入口下次打开显示的就是新值。目录加载与选择共享一个代次计数器（旧响应永不覆盖新结果）；提供方级目录失败内联列出，可用分组保持可选；整体失败与选择失败落各入口自己的重试面（popup 壳的 error/retry、坑位菜单的内联错误），状态不分叉。目录按会话惰性解析（`ctx.models.directoryFor(sessionId)`），随会话 scope 一并释放。
+
+`/client` 导出面为插件本体（`apply`/`inject`）、`ModelService`、`ModelDirectory` 及其状态形状、坑位注入面类型。
+
+## Model Experience
+
+间接影响，经两个入口共同提交的 `session.selectModel` RPC：host 在下一次提示词组装边界快照所选提供方/模型对，因此后续请求按所选目标路由（并盖入提示词变量），运行中的步骤保持其已组装目标——目录、两个菜单及全部选择交互都留在 client 侧，永不进入 session log。
+
+#### KV Cache effect
+
+切换路由可能降低或作废提供方侧后续请求的缓存复用；提示词前缀本身不受影响。
+
+## Known Limitations and Deferred Work
+
+- **无创建期选择**——两个入口都寻址既有会话的 agent；没有 Draft 期模型选择折入会话创建的通道（host `targetFor` 处的种子序注释记录了该层未来的落点）。
+- **目录名仅供呈现**——选择与持久化使用提供方/模型 id；目录查询失败的提供方以不可选失败行列出，重新加载前保持原样。
+- **坑位不显示 effort 档位**——figma 设计稿中的 `High` 文本尚无对应 wire 概念；触发器只渲染模型名。

packages/client/ui-model/src/client/directory.ts

@@ -27,6 +27,7 @@ export interface ModelDirectoryState {
 
 /** One session's shared directory controller; disposed with the session scope. */
 export class ModelDirectory {
+  /** The shared snapshot both entries render from (uSES-safe store). */
   readonly store: SnapshotStore<ModelDirectoryState> = createSnapshotStore<ModelDirectoryState>({
     current: null, groups: [], failures: [], status: 'idle', error: null,
   })