feat: per-tool settings, persistent settings file, Codex and Antigravity sessions, tokens and hooks (#40 B, C1, C2, D)

Part B: Model Pricing, Hook Configuration and CLAUDE_HOME move from
Settings → Dashboard to the Claude Code tab's AgentHub sub-tab
(ClaudeAgentHubSettings.tsx); CODEX_HOME is editable in Codex → AgentHub.
A home that is or contains the OS home is refused (EBADHOME).

Settings persistence: dashboard-saved settings go to
~/.config/agenthub/settings.env (AGENTHUB_SETTINGS_FILE), outside the plugin
cache an update wipes. Load order: real env > the checkout's .env > that file.
The first CLAUDE_HOME change pins DASHBOARD_DATA_DIR so the DB stays put.

C1: codex-usage.js reads Codex rollout journals into sessions (new column
tool) and token_usage, tracked per file in codex_rollouts; forks deduped by
total vector, sub-agent threads folded into the root; pricing-sync also
prices OpenAI models; PricingSettings with a vendor filter.

C2: codex-hooks.js installs AgentHub's hooks into $CODEX_HOME/hooks.json on
a click, through a stable forwarder; Codex trust is never written. The hook
route creates tool='codex' sessions and folds sub-agent hooks into the root.

D: antigravity-usage.js reads agy's per-conversation SQLite files (tokens
from ModelUsageStats) into tool='antigravity' sessions; antigravity-hooks.js
installs the named hook `agenthub` (PreInvocation, PostToolUse, Stop — never
PreToolUse) into ~/.gemini/config/hooks.json; Settings → Antigravity tab;
Gemini pricing.

Whole-change review fixes: sameOriginGuard on both home PUTs, routers.missing
on a CLAUDE_HOME change, reset-pricing scope, GET /api/sessions?tool=,
clear-data covering the new tables, Codex child-thread events moving no
status, hooks owning status only while current, EFOREIGN for a forwarder
that is not ours, agy quiet window and turn rules, AGENTHUB_SETTINGS_FILE
honoured from .env.

Docs, OpenAPI and the CLAUDE.md marker updated. Server 2141, client 779.

client/README.md

@@ -186,6 +186,13 @@ client/
 │   │   ├── Sidebar.tsx
 │   │   ├── Layout.tsx
 │   │   ├── RemoteSources.tsx  # Remote Data Sources settings panel (SSH multi-machine collection)
+│   │   ├── SessionToolBadge.tsx  # The CLI that produced a non-Claude session, by its AI Tools label (nothing for Claude)
+│   │   ├── settings/       # Settings panels, among them:
+│   │   │   ├── PricingSettings.tsx          # Model Pricing table, `vendor` filter + Show all models
+│   │   │   ├── ClaudeAgentHubSettings.tsx   # Claude Code → AgentHub: pricing, hook status, CLAUDE_HOME
+│   │   │   ├── HomeDirSetting.tsx           # CLAUDE_HOME / CODEX_HOME editor (env-owned warning)
+│   │   │   ├── CodexHooksSettings.tsx       # Codex → AgentHub → Codex hooks card
+│   │   │   └── AntigravityHooksSettings.tsx # Antigravity → Antigravity hooks card
 │   │   └── workflows/      # Workflows page panels: own-pipeline stats + D3 analytics (11 files)
 │   │
 │   ├── pages/              # Route pages
@@ -195,6 +202,7 @@ client/
 │   │   ├── ActivityFeed.tsx  # Real-time event log; row click expands payload; Session btn navigates
 │   │   ├── Workflows.tsx
 │   │   ├── Settings.tsx
+│   │   ├── AntigravityConfig.tsx  # Settings → Antigravity: Gemini pricing + Antigravity hooks
 │   │   └── NotFound.tsx
 │   │
 │   ├── lib/                # Core utilities & business logic
@@ -210,7 +218,7 @@ client/
 │   │   ├── useNotifications.ts  # Browser push notification triggers
 │   │   └── useTheme.ts          # Dark/light/system mode + per-mode named theme: `dark` class, `data-mode`, `data-theme` on <html>, persisted to localStorage
 │   │
-│   ├── i18n/               # Internationalization (en / zh / vi / ko)
+│   ├── i18n/               # Internationalization (en / vi)
 │   ├── App.tsx             # Root component + router setup
 │   ├── main.tsx            # Entry point
 │   └── index.css           # Tailwind + CSS-variable color tokens (dark/light)
@@ -239,7 +247,7 @@ graph TB
     Detail[SessionDetail<br/>agent hierarchy + timeline]
     Feed[ActivityFeed<br/>streaming event log]
     Workflows[Workflows<br/>Lane pipelines + D3 analytics]
-    Settings[Settings<br/>pricing + notifications + hooks]
+    Settings[SettingsHub<br/>Dashboard tab: appearance + notifications + data<br/>Claude Code / Codex → AgentHub, Antigravity:<br/>each tool's pricing + hooks]
 
     App --> Layout
     Layout --> Dashboard & Sessions & Detail & Feed & Workflows & Settings
@@ -285,7 +293,7 @@ sequenceDiagram
 
 The client uses **local component state** and **React hooks** for state management. No global state library (Redux, Zustand) is used to keep the architecture simple. The one small exception is the **data-scope store** (`lib/dataScope.ts`): a lightweight app-wide store holding the current set of data sources (`local` plus any configured [Remote Data Sources](../server/README.md#remote-data-sources)). Pages read it and append `?sources=` to their API requests, so a single selector narrows the whole app to one or more machines' data. Remote sources are managed from the Settings page via the `RemoteSources` component (`components/RemoteSources.tsx`), which drives the `/api/remote-sources` CRUD/test/sync endpoints and reflects live `remote_source.status` WebSocket updates. When a sync finishes, stats pages refetch via `lib/remoteDataEvents.ts` (`remote_data.updated`, `remote_source.status` with `ok`, or remote `import.progress` complete).
 
-**Cursor sessions (informational):** Settings surfaces a subtle note on the CLAUDE_HOME, Import History, and Remote Data Sources panels — **Cursor** agent sessions count too because Cursor stores transcripts under the same `~/.claude` paths as Claude Code locally (and on synced remotes).
+**Cursor sessions (informational):** Settings surfaces a subtle note on the CLAUDE_HOME (Settings → Claude Code → AgentHub), Import History, and Remote Data Sources panels — **Cursor** agent sessions count too because Cursor stores transcripts under the same `~/.claude` paths as Claude Code locally (and on synced remotes).
 
 ### State Strategy