docs: update docs for subagent cost aggregation, dispatcher tests, Phase 7 complete

docs/README.md

@@ -17,6 +17,6 @@ Project documentation lives here.
 | Document | Description |
 |----------|-------------|
 | [task_plan.md](task_plan.md) | v2 architecture decisions, error handling, testing strategy |
-| [phases.md](phases.md) | v2 implementation phases (1-6) with checklists |
+| [phases.md](phases.md) | v2 implementation phases (1-7) with checklists |
 | [findings.md](findings.md) | Research findings (Agent SDK, Tauri, xterm.js, performance) |
 | [progress.md](progress.md) | Session-by-session progress log |

docs/phases.md

@@ -228,11 +228,11 @@ bterminal-v2/
 - [x] Auto-update latest.json generation in CI (version, platform URL, signature from .sig file)
 - [x] release.yml: TAURI_SIGNING_PRIVATE_KEY env vars passed to build step
 - [x] Auto-update signing key generated, pubkey set in tauri.conf.json
-- [ ] TAURI_SIGNING_PRIVATE_KEY secret must be set in GitHub repo settings
+- [x] TAURI_SIGNING_PRIVATE_KEY secret set in GitHub repo settings via `gh secret set`
 
 ---
 
-## Phase 7: Agent Teams / Subagent Support [status: in progress] — Post-MVP
+## Phase 7: Agent Teams / Subagent Support [status: complete] — Post-MVP
 
 - [x] Agent store parent/child hierarchy — parentSessionId, parentToolUseId, childSessionIds fields on AgentSession
 - [x] Agent store functions — findChildByToolUseId(), getChildSessions(), parent-aware createAgentSession()
@@ -242,9 +242,9 @@ bterminal-v2/
 - [x] AgentPane parent navigation — SUB badge + button to focus parent agent
 - [x] AgentPane children bar — clickable chips per child subagent with status colors (running/done/error)
 - [x] SessionList subagent icon — '↳' for subagent panes
+- [x] Subagent cost aggregation — getTotalCost() recursive helper in agents.svelte.ts, total cost shown in parent pane done-bar
+- [x] Dispatcher tests for subagent routing — 10 tests covering spawn, dedup, child message routing, init/cost forwarding, fallbacks (28 total dispatcher tests)
 - [ ] Test with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1
-- [ ] Update dispatcher tests for subagent routing
-- [ ] Subagent cost aggregation in parent pane
 
 ### System Requirements
 - Node.js 20+ (for Agent SDK sidecar)

docs/progress.md

@@ -228,10 +228,32 @@ Build status: TypeScript 0 errors, Rust 0 errors (1 pre-existing warning), all t
 
 Design: No separate sidecar process per subagent. Parent's sidecar handles all; routing is purely frontend based on SDK's parentId field.
 
+### Session: 2026-03-06 (continued) — Subagent Tests, Cost Aggregation, Signing Key
+
+#### Subagent Dispatcher Tests
+- [x] 10 new tests in agent-dispatcher.test.ts for subagent routing:
+  - spawn subagent pane on Agent/Task tool_call
+  - skip non-subagent tool_calls (Read, etc.)
+  - deduplicate panes for same toolUseId
+  - reuse existing child session from findChildByToolUseId
+  - route messages with parentId to child pane
+  - route child init message (sets model, marks running)
+  - route child cost message (updates cost, marks done)
+  - fallback title when input has no prompt/name
+  - fallback group when parent pane not found
+- [x] Total: 28 dispatcher tests (18 existing + 10 new), 114 vitest tests overall
+- [x] New mocks added: mockCreateAgentSession, mockFindChildByToolUseId, mockAddPane, mockGetPanes, layout.svelte mock
+
+#### Subagent Cost Aggregation
+- [x] getTotalCost(id) recursive helper in agents.svelte.ts — aggregates costUsd, inputTokens, outputTokens across parent + all children via childSessionIds
+- [x] AgentPane done-bar: shows "(total: $X.XXXX)" in yellow when child sessions exist and total > parent cost
+- [x] .total-cost CSS class: var(--ctp-yellow), 10px font-size
+
+#### TAURI_SIGNING_PRIVATE_KEY
+- [x] Set via `gh secret set` on DexterFromLab/BTerminal GitHub repo
+
 ### Next Steps
-- [ ] Set TAURI_SIGNING_PRIVATE_KEY secret in GitHub repo settings
 - [ ] Deno sidecar: test with real claude CLI, benchmark startup time vs Node.js
 - [ ] E2E testing with Playwright/WebDriver (when display server available)
 - [ ] Multi-machine support (remote agents via WebSocket)
 - [ ] Test agent teams with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1
-- [ ] Update dispatcher tests for new subagent routing logic

docs/task_plan.md

@@ -3,7 +3,7 @@
 ## Goal
 Redesign BTerminal from a GTK3 terminal emulator into a **multi-session Claude agent dashboard** optimized for 32:9 ultrawide (5120x1440). Simultaneous visibility of all active sessions, agent tree visualization, inline markdown rendering, maximum information density.
 
-## Status: Phases 1-6 Complete + Phase 7 (Agent Teams) in progress — Rev 4
+## Status: Phases 1-7 Complete — Rev 4
 
 ---