fix(kanban): i18n wake messages — address review feedback on #54872

Addresses @tonydwb's review on PR #54872 (12:05 UTC, 2026-06-29):

  > the hardcoded Chinese text in the wake messages (lines 118-128 of
  > the diff) should be replaced with English or internationalized.
  > The rest of the codebase uses English for user-facing messages,
  > and hardcoded Chinese will confuse non-Chinese users. Consider
  > using a constants dict or the existing i18n infrastructure.

Used the existing i18n infrastructure (agent/i18n.py::t()) — the same
surface gateway/run.py and slash_commands.py already use for static
user-facing strings.

## Changes

- gateway/kanban_watchers.py: import `t` from agent.i18n; replace the
  hardcoded Chinese strings in the synthetic wake-up message with
  t("gateway.kanban.wake.*") lookups. Behavior unchanged for zh users
  (zh catalog preserves the original Chinese phrasing).

- locales/en.yaml: new `gateway.kanban.wake.*` baseline keys (English):
  completed / gave_up / crashed / timed_out / blocked / status_default
  / status_joiner / message (with {task_id} {status} {title}
  {assignee} {board} placeholders).

- locales/zh.yaml: Chinese translation of the new keys, preserving the
  exact wording the original code used (so existing zh users see no
  visible change).

- locales/{zh-hant,ja,de,es,fr,tr,uk,af,ko,it,ga,pt,ru,hu}.yaml: added
  the same key set with English fallback values. The i18n invariant
  test (tests/agent/test_i18n.py::test_catalog_keys_match_english)
  requires every catalog to carry the same key set as en.yaml; native
  translations can land incrementally without breaking users (the
  loader falls back to en.yaml per-key when a translation is missing,
  but the key must still exist).

## Verification

- scripts/run_tests.sh tests/agent/test_i18n.py
  tests/gateway/test_kanban_watchers_mixin.py
  tests/gateway/test_kanban_notifier.py
  tests/gateway/test_kanban_notifier_watcher_dispatch_gate.py
  → 60 passed, 0 failed (i18n catalog parity + placeholders parity +
  existing kanban notifier behavior).

- Manual: with HERMES_LANGUAGE=en, t("gateway.kanban.wake.completed")
  returns "completed"; with HERMES_LANGUAGE=zh, returns "已完成";
  with HERMES_LANGUAGE=ja (translation pending), falls back to
  "completed" per-key.

gateway/kanban_watchers.py

@@ -18,6 +18,8 @@ import time
 from pathlib import Path
 from typing import Any, Callable, Optional
 
+from agent.i18n import t
+
 # Match the logger run.py uses (logging.getLogger(__name__) where __name__ ==
 # "gateway.run") so extracted log records keep their original logger name.
 logger = logging.getLogger("gateway.run")
@@ -486,17 +488,19 @@ class GatewayKanbanWatchersMixin:
                                     _title = (task.title if task else sub["task_id"])[:120]
                                     _assignee = task.assignee if task else ""
                                     _parts = []
-                                    if "completed" in _wake_kinds: _parts.append("已完成")
-                                    if "gave_up" in _wake_kinds: _parts.append("已放弃（重试次数耗尽）")
-                                    if "crashed" in _wake_kinds: _parts.append("崩溃（worker 异常退出），dispatcher 将重试")
-                                    if "timed_out" in _wake_kinds: _parts.append("超时，dispatcher 将重试")
-                                    if "blocked" in _wake_kinds: _parts.append("被阻塞，需要处理")
-                                    _status = "，".join(_parts) or "状态变化"
-                                    _synth = (
-                                        f"[kanban] 任务 {sub['task_id']} {_status}。\n"
-                                        f"标题: {_title}\n执行者: @{_assignee}\n"
-                                        f"看板: {board_slug}\n\n"
-                                        f"请检查结果或决定下一步动作。"
+                                    if "completed" in _wake_kinds: _parts.append(t("gateway.kanban.wake.completed"))
+                                    if "gave_up" in _wake_kinds: _parts.append(t("gateway.kanban.wake.gave_up"))
+                                    if "crashed" in _wake_kinds: _parts.append(t("gateway.kanban.wake.crashed"))
+                                    if "timed_out" in _wake_kinds: _parts.append(t("gateway.kanban.wake.timed_out"))
+                                    if "blocked" in _wake_kinds: _parts.append(t("gateway.kanban.wake.blocked"))
+                                    _status = t("gateway.kanban.wake.status_joiner").join(_parts) or t("gateway.kanban.wake.status_default")
+                                    _synth = t(
+                                        "gateway.kanban.wake.message",
+                                        task_id=sub["task_id"],
+                                        status=_status,
+                                        title=_title,
+                                        assignee=_assignee,
+                                        board=board_slug,
                                     )
                                     from gateway.session import SessionSource
                                     from gateway.platforms.base import MessageEvent, MessageType