feat(run,notifications,profiles): stop sending prompts nobody typed, and fix notification + profile delivery

Run console:
- Picking a pipeline no longer pre-writes anything into the prompt box
  (`promptPrefill` in `LaneConsolePane.tsx` is gone — it wrote the driving
  slash command on a claude lane and a stage checklist on a codex one).
  Whatever sits in that box is sent as a real prompt the moment the run
  starts, so the box is the user's alone now.
- Resuming a session sends NO prompt at all (`handleStart` in `RunSetup.tsx`):
  the resumed session carries its own transcript, and leftover text in the box
  fired an extra turn into it.

Notifications:
- `client/src/lib/notify.ts` is now the ONE sender, used by both
  `useNotifications` and Settings' test button, and it reports where the
  notification landed: `POST /api/push/send` answering `{native:false,pushed:0}`
  means it went NOWHERE, so the client falls back to a local notification
  instead of counting the 200 as delivered.
- A notification carries the lane that raised it (`/workspace?lane=<id>`), and
  Workspace selects that lane on arrival.

Profiles:
- `server/lib/cc-profiles.js` reads and writes the macOS login Keychain item
  `Claude Code-credentials`, where the `claude` CLI actually keeps
  `claudeAiOauth` on darwin — a switch used to rewrite a file nothing reads.
  The file stays the fallback, is kept in step only when it already exists, and
  `AGENTHUB_CC_KEYCHAIN=0` pins it (tests set it).

Tests: npm run test:server (1820 pass), client vitest (553 pass).

client/src/i18n/locales/en/lanes.json

@@ -49,7 +49,7 @@
   "addLaneToolClaude": "Claude Code",
   "addLaneToolCodex": "Codex",
   "addLaneToolHint": "Which CLI drives this lane. Cannot be changed later.",
-  "addLaneWriteDocsHint": "Opens the lane's terminal on creation and runs the /sg-all:sg-md-writing skill there.",
+  "addLaneWriteDocsHint": "On creation, opens the lane's terminal and runs /sg-all:sg-md-writing there: creates CLAUDE.md/AGENTS.md if missing, or updates them concisely if they already exist.",
   "addLaneWriteDocsLabel": "Create/update readme file",
   "autoStage": "auto: {{stage}}",
   "browse.button": "Browse",

client/src/i18n/locales/en/settings.json

@@ -84,7 +84,11 @@
     "sessionComplete": "Session completes",
     "sessionError": "Session errors",
     "subagentSpawned": "Subagent spawned",
+    "testBlocked": "The browser has not granted notification permission.",
     "testBody": "Notifications are working!",
+    "testFailed": "Nothing could be shown.",
+    "testLocal": "Your browser has no push subscription, so this was shown locally. Web Push needs a secure origin (localhost or HTTPS) and a registered service worker.",
+    "testSent": "Sent via push — check your notification centre.",
     "testTitle": "Agent Monitor",
     "title": "Notifications",
     "turnComplete": "Claude finishes a turn"

client/src/i18n/locales/vi/lanes.json

@@ -49,7 +49,7 @@
   "addLaneToolClaude": "Claude Code",
   "addLaneToolCodex": "Codex",
   "addLaneToolHint": "CLI nào điều khiển lane này. Không thể thay đổi sau này.",
-  "addLaneWriteDocsHint": "Khi tạo lane sẽ mở terminal của lane và chạy skill /sg-all:sg-md-writing tại đó.",
+  "addLaneWriteDocsHint": "Khi tạo lane sẽ mở terminal và chạy skill /sg-all:sg-md-writing: tạo CLAUDE.md/AGENTS.md nếu chưa có, hoặc cập nhật ngắn gọn nếu đã có.",
   "addLaneWriteDocsLabel": "Tạo/cập nhật file readme",
   "autoStage": "tự động: {{stage}}",
   "browse.button": "Duyệt",

client/src/i18n/locales/vi/settings.json

@@ -84,7 +84,11 @@
     "sessionComplete": "Phiên hoàn tất",
     "sessionError": "Phiên gặp lỗi",
     "subagentSpawned": "Subagent được tạo",
+    "testBlocked": "Trình duyệt chưa cấp quyền thông báo.",
     "testBody": "Thông báo đang hoạt động!",
+    "testFailed": "Không hiển thị được thông báo nào.",
+    "testLocal": "Trình duyệt chưa đăng ký push nên thông báo được hiện tại chỗ. Web Push cần origin bảo mật (localhost hoặc HTTPS) và service worker đã đăng ký.",
+    "testSent": "Đã gửi qua push — kiểm tra trung tâm thông báo.",
     "testTitle": "Agent Monitor",
     "title": "Thông báo",
     "turnComplete": "Claude trả lời xong"