fix: orchestrator button + Pi SDK session error

- Move leftSidebarMode from URL state to local useState in unified-shell,
    avoiding force-dynamic router round-trip that made the button appear broken                                           - Replace fileURLToPath(new URL(..., import.meta.url)) with process.cwd()
    in bb-pi-bootstrap.ts — import.meta.url is a webpack:// URL in Next.js,
    causing cross-realm TypeError when passed to Node.js fileURLToPath()

docs/plans/2026-03-07-phase-7-tests.md

@@ -0,0 +1,95 @@
+# Phase 7 - Tests and Verification
+
+**Status:** Planning
+**Created:** 2026-03-07
+**Goal:** Add comprehensive tests for embedded Pi runtime and agent system
+
+---
+
+## Test Categories
+
+### 1. Unit Tests
+
+**Runtime Path Resolution:**
+- `pi-runtime-detection.test.ts` - SDK detection, path resolution
+- `bb-pi-bootstrap.test.ts` - bootstrap process
+
+**Event Projection:**
+- `embedded-daemon.test.ts` - event emission, deduplication
+- `orchestrator-chat.test.ts` - message projection
+
+**Worker Session:**
+- `worker-session-manager.test.ts` - spawn, status, lifecycle
+
+### 2. Contract Tests
+
+**Adapter Schemas:**
+- Pi SDK adapter input/output contracts
+- Runtime event schema validation
+
+### 3. Integration Tests
+
+**Orchestrator Flow:**
+- Session creation
+- Prompt submission
+- Tool execution
+- Response handling
+
+**Worker Flow:**
+- Worker spawn
+- Bead claim/update/close
+- Result retrieval
+
+### 4. UI Tests
+
+**Left Panel:**
+- Chat rendering
+- Message projection
+- Error display
+
+---
+
+## Implementation Plan
+
+### Step 1: Unit Test Setup
+- Configure test runner (Jest or Vitest)
+- Create test utilities for mocking Pi SDK
+
+**Files:**
+- `tests/setup.ts`
+- `tests/mocks/pi-sdk.ts`
+
+### Step 2: Runtime Unit Tests
+- Test path detection
+- Test bootstrap process
+- Test event deduplication
+
+### Step 3: Worker Unit Tests
+- Test spawn flow
+- Test status tracking
+- Test result collection
+
+### Step 4: Integration Tests
+- Test full orchestrator flow
+- Test worker-to-bead workflow
+
+---
+
+## Blocked Items
+
+None identified.
+
+---
+
+## Success Criteria
+
+- [ ] Unit tests for runtime components pass
+- [ ] Unit tests for worker session manager pass
+- [ ] Integration tests for orchestrator flow pass
+- [ ] Integration tests for worker flow pass
+
+---
+
+## Estimated Effort
+
+4-5 hours