feat(pet): cleared alerts stay cleared, contextual bubbles, i18n, moments, chat window

- Fix: an errored session alerted on every update, and Clear alerts only
  dropped it in memory, so its next update (or a reload) brought the alert
  straight back. An error now alerts on the transition into error only;
  cleared sessions are remembered (agenthub.pet.dismissedErrors) and stay
  quiet until they recover and fail anew.
- Quips, greetings, notifications and Ask answers move to i18n (EN/VI);
  Ask understands Vietnamese keywords and names the sessions it counts.
- The pet goes by the worn pet's name; click it in the panel to rename
  (agenthub.pet.names, synced to the account).
- Bubbles name the session they are about, with an Open button (never a
  resume); a burst of the same event coalesces into one count.
- Moments: a new session waves, a finish hops, a subagent peeks, a wait taps,
  an error flinches — on Sagi, Codex sprites and still images. Idle fidgets,
  a once-per-session greeting, a "Needs you" list, an amber waiting dot.
- Pat (heart button, Ask, or stroking the pet) reacts on the pet itself, so
  it shows while the panel or chat is open.
- Panel drops Run Claude / Activity / Sessions / Errored.
- Ask hands off to a chat window (PetChat) on the default AI tool
  (Claude/Codex): transcript as bubbles, follow-ups and CLI menus through an
  off-screen attached terminal; no new server route.

Verified on HEAD + this diff in a clean worktree: tsc -b, the full client
suite (1334/1335; the one failure, ConversationView.follow, is flaky under
load and passes 3/3 alone) and server me-prefs.test.js.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ARCHITECTURE.md

@@ -2354,7 +2354,7 @@ graph TD
         SHELL["Sagi.tsx<br/>shell: open/closed state,<br/>⌘B / Esc, reduced-motion,<br/>navigation"]
         AVATAR["SagiAvatar.tsx<br/>SVG mascot; data-mood drives CSS;<br/>cursor-tracking pupils"]
         BUBBLE["SpeechBubble.tsx<br/>bubble"]
-        PANEL["SagiPanel.tsx<br/>status + quick actions + Ask box"]
+        PANEL["SagiPanel.tsx<br/>status + Needs you + Mute / Clear alerts + Ask box"]
         CSS["sagi.css<br/>keyframes + per-mood expressions"]
     end
 
@@ -2401,16 +2401,17 @@ The mood state machine in `deriveMood` resolves to a single expression using a f
 
 | Component | Responsibility |
 | --- | --- |
-| **`brain.ts`** | Pure, framework-free core. Exposes a `WSMessage` reducer (`reduceSagi`) and a mood state machine (`deriveMood`) with the priority order `disconnected > worried > stuck > happy > thinking > watching > sleeping > idle`. The clock is injected and there are zero side effects, so the brain is fully unit-tested in isolation. |
-| **`useSagiBrain.ts`** | The **only** consumer of the global `eventBus`. Wires the pure brain to real timers (idle / sleep / stuck), the speech-bubble queue, mute, and clear-alerts. Produces the derived `{ mood, status, bubble }` the presentational components render. |
+| **`brain.ts`** | Pure, framework-free core. Exposes a `WSMessage` reducer (`reduceSagi`, which also returns the `subject` session a pulse is about — name, cwd, lane) and a mood state machine (`deriveMood`) with the priority order `disconnected > worried > stuck > happy > thinking > watching > sleeping > idle`. An error alerts on the transition INTO `error` only, and **Clear alerts** (`clearErrors`) moves the errored sessions into `dismissed`: their later updates, agent errors and failure events stay silent until the session goes active again or ends. `attentionOf` lists errored then waiting sessions by name; `MOMENT_OF_PULSE` maps each pulse to a pet animation. The clock is injected and there are zero side effects, so the brain is fully unit-tested in isolation. |
+| **`useSagiBrain.ts`** | The **only** consumer of the global `eventBus`. Wires the pure brain to real timers (idle / sleep / stuck), the speech bubble (naming the session it is about; the same pulse again within 8 s joins it as a count), the one-shot `moment` animation, a once-per-browser-session greeting, an idle fidget every minute or so, pat, mute, and clear-alerts (the dismissed ids persist in `localStorage` `agenthub.pet.dismissedErrors`, newest 200). The reducer runs outside React's updater so StrictMode never doubles a pulse. Produces `{ mood, status, attention, bubble, moment }`. |
 | **`SagiAvatar.tsx`** | Pure presentational SVG mascot. The `data-mood` attribute drives CSS; pupils track the cursor. Rendered at 90×90 px (`size` default, kept in sync with `SAGI_SIZE` in `useSagiPosition.ts`, which is the draggable button's real footprint) through a `viewBox` cropped to the artwork's measured bounding box instead of the exporter's padded `0 0 1280 1280` canvas. Path data is never rescaled, so `MAX_PUPIL_SHIFT` stays in the original 1280-unit space. The `transform-origin` values in `sagi.css` do **not**: an origin on an inner SVG element resolves against `transform-box: view-box`, whose 0,0 sits at the `viewBox` min (`253.5 106`), so those are mascot coordinates **minus that offset**. The root `.sagi-avatar` origin is a percentage on purpose — on the outermost `<svg>` a length would be measured against the 68 px CSS box, and the resulting ~9× overshoot turns every mood animation into a whole-avatar lurch. |
-| **`SpeechBubble.tsx`** | Pure presentational speech bubble. |
-| **`SagiPanel.tsx`** | Pure presentational panel: status readout + quick actions + the Ask box. |
-| **`Sagi.tsx`** | Shell component. Mounted once in `client/src/components/Layout.tsx` as a sibling of `UpdateNotifier`. Owns open/closed state, the `⌘B` / `Esc` shortcuts, reduced-motion detection, and navigation. |
-| **`intents.ts`** | Pure local Q&A over the cached status snapshot. Queries that don't match a local intent become a handoff: `Sagi.tsx` calls `POST /api/lanes/ensure` (adopting the "Sagi" lane whose cwd defaults to `$HOME`), then `POST /api/run` to spawn a fresh tmux-backed `claude` session in that lane with the prompt as its `initialPrompt`, then navigates to `/run?laneId=…&autostart=1` so the live run is observable. |
-| **`quips.ts`** | Pure mood → phrase pools. |
-| **`prefs.ts`** | `localStorage`-backed enabled / muted preferences with cross-tab sync. |
-| **`sagi.css`** | Keyframes and per-mood expressions; selected via the `data-mood` attribute. |
+| **`SpeechBubble.tsx`** | Pure presentational speech bubble: the line, the session(s) it is about, and an **Open** button for a single one (`workspaceHref` — its live pane, else its replay, else `/sessions/<id>`; never a resume). |
+| **`SagiPanel.tsx`** | Pure presentational panel: the pet's name (click to rename — `agenthub.pet.names`, synced to the account), a pat button, status readout, a **Needs you** list of errored/waiting sessions by name, Mute and Clear alerts, and the Ask box. |
+| **`PetChat.tsx`** | The pet's chat window (Ask handoff, or **Chat with …** in the panel), styled as a soft accent gradient with chat bubbles. The first message starts a session of the user's default AI tool (`agenthub.defaultTool`; Claude or Codex — any other tool still opens its pane in the workspace) in the "Sagi" workspace's first free tab; replies are read from the session's transcript every 1.5 s, and follow-ups and menu answers (`PaneMenuCard`) go through a `TerminalView` attached off-screen (`submitToRun`), so no new route exists. The chat is kept in `localStorage` (`agenthub.pet.chat`) while its pane lives; an ended pane is never resumed — the next message starts a new session. |
+| **`Sagi.tsx`** | Shell component. A pat (the panel's heart, the Ask box, or stroking the pet — four left/right turns of the pointer over it within 1.2 s) shows hearts and a line ON the pet, so it reads while the panel or chat is open. Mounted once in `client/src/components/Layout.tsx` as a sibling of `UpdateNotifier`. Owns open/closed state, the `⌘B` / `Esc` shortcuts, reduced-motion detection, and navigation. |
+| **`intents.ts`** | Local Q&A over the cached status snapshot, in English and Vietnamese keywords, answering in the UI language and naming the sessions it counts (also: who are you, hello, thanks, pat). Queries that don't match a local intent open `PetChat`; with a default tool it cannot read back, `Sagi.tsx` instead calls `POST /api/lanes/ensure` (adopting the "Sagi" lane whose cwd defaults to `$HOME`), then `POST /api/run` to spawn a fresh tmux-backed `claude` session in that lane with the prompt as its `initialPrompt`, then navigates to `/run?laneId=…&autostart=1` so the live run is observable. |
+| **`quips.ts`** | Mood/pulse → phrase pools, plus greetings and pat lines, read from `settings:sagi.{quips,greet,pat}` so they follow the UI language. |
+| **`prefs.ts`** | `localStorage`-backed enabled / muted / pet / size / nickname preferences with cross-tab sync; `petName` = nickname, else the worn pet's own name, else Sagi. |
+| **`sagi.css`** | Keyframes and per-mood expressions (`data-mood`), plus the one-shot moments (`data-moment`: jump, wave, fail, wait, review) on Sagi's art and an uploaded image. |
 
 ### Touchpoints Outside the Folder
 
@@ -2422,7 +2423,7 @@ Sagi's only contact with the rest of the app is four light, additive touchpoints
 | `client/src/pages/Settings.tsx` | On/off toggle wired to `sagiPrefs` (`localStorage`). |
 | `client/src/pages/Run.tsx` | Consumes `?laneId=` to attach the page to the lane whose run Sagi just spawned. |
 | `server/routes/lanes.js` (`POST /api/lanes/ensure`) | Accepts a missing `cwd` and resolves it to `os.homedir()` so the mascot can adopt a stable "Sagi" lane. |
-| `client/src/i18n/locales/{en,vi}/settings.json` | `sagi.*` strings for the Settings toggle (zh / ko fall back to the hardcoded English defaults). |
+| `client/src/i18n/locales/{en,vi}/settings.json` | Every `sagi.*` string: the Settings toggle, the panel, the bubbles' quips, coalesced counts, greetings and Ask answers. |
 
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