docs: update meta files for Claude CLI path detection and split progress log

- Added pathToClaudeCodeExecutable and findClaudeCli() docs to CLAUDE.md,
  .claude/CLAUDE.md, task_plan.md decisions log, and CHANGELOG.md
- Split docs/progress.md (425 lines) into progress.md (153 lines) +
  progress-archive.md (180 lines) to stay under 300-line threshold
- Updated docs/README.md, README.md with archive file reference
- Updated TODO.md with completed items from this session

docs/progress.md

@@ -1,256 +1,6 @@
 # BTerminal v2 — Progress Log
 
-## Session: 2026-03-05
-
-### Research Phase (complete)
-- [x] Analyzed current BTerminal v1 codebase (2092 lines Python, GTK3+VTE)
-- [x] Queried Memora — no existing BTerminal memories
-- [x] Researched Claude Agent SDK — found structured streaming, subagent tracking, hooks
-- [x] Researched Tauri + xterm.js ecosystem — found 4+ working projects
-- [x] Researched terminal latency benchmarks — xterm.js acceptable for AI output
-- [x] Researched 32:9 ultrawide layout patterns
-- [x] Evaluated GTK4 vs Tauri vs pure Rust — Tauri wins for this use case
-- [x] Created task_plan.md with 8 phases
-- [x] Created findings.md with 7 research areas
-
-### Technology Decision (complete)
-- Decision: **Tauri 2.x + Solid.js + Claude Agent SDK + xterm.js**
-- Rationale documented in task_plan.md Phase 0
-
-### Adversarial Review (complete)
-- [x] Spawned devil's advocate agent to attack the plan
-- [x] Identified 5 fatal/critical issues:
-  1. Node.js sidecar requirement unacknowledged
-  2. SDK 0.2.x instability — need abstraction layer
-  3. Three-tier observation overengineered → simplified to two-tier
-  4. Solid.js ecosystem too small → switched to Svelte 5
-  5. Missing: packaging, error handling, testing, responsive design
-- [x] Revised plan (Rev 2) incorporating all corrections
-- [x] Added error handling strategy table
-- [x] Added testing strategy table
-- [x] Defined MVP boundary (Phases 1-4)
-- [x] Added responsive layout requirement (1920px degraded mode)
-
-### Phase 1 Scaffolding (complete)
-- [x] Created feature branch `v2-mission-control`
-- [x] Initialized Tauri 2.x + Svelte 5 project in `v2/` directory
-- [x] Rust backend stubs: main.rs, lib.rs, pty.rs, sidecar.rs, watcher.rs, session.rs
-- [x] Svelte frontend: App.svelte with Catppuccin Mocha CSS variables, component stubs
-- [x] Node.js sidecar scaffold: agent-runner.ts with NDJSON communication pattern
-- [x] Tauri builds and launches (cargo build --release verified)
-- [x] Dev scripts: npm run dev, npm run build, npm run tauri dev/build
-- [x] 17 operational rules added to `.claude/rules/`
-- [x] Project meta files: CLAUDE.md, .claude/CLAUDE.md, TODO.md, CHANGELOG.md
-- [x] Documentation structure: docs/README.md, task_plan.md, phases.md, findings.md, progress.md
-
-### Phase 2: Terminal Pane + Layout (complete)
-- [x] Rust PTY backend with portable-pty (PtyManager: spawn, write, resize, kill)
-- [x] PTY reader thread emitting Tauri events (pty-data-{id}, pty-exit-{id})
-- [x] Tauri commands: pty_spawn, pty_write, pty_resize, pty_kill
-- [x] xterm.js terminal pane with Canvas addon (explicit, no WebGL)
-- [x] Catppuccin Mocha theme for xterm.js (16 ANSI colors)
-- [x] FitAddon with ResizeObserver + 100ms debounce
-- [x] PTY bridge adapter (spawnPty, writePty, resizePty, killPty, onPtyData, onPtyExit)
-- [x] CSS Grid tiling layout with 5 presets (1-col, 2-col, 3-col, 2x2, master-stack)
-- [x] Layout store with Svelte 5 $state runes and auto-preset selection
-- [x] Sidebar with session list, layout preset selector, new terminal button
-- [x] Keyboard shortcuts: Ctrl+N new terminal, Ctrl+1-4 focus pane
-- [x] PaneContainer with header bar (title, status, close)
-- [x] Empty state welcome screen with Ctrl+N hint
-- [x] npm dependencies: @xterm/xterm, @xterm/addon-canvas, @xterm/addon-fit
-- [x] Cargo dependencies: portable-pty, uuid
-
-### Phase 3: Agent SDK Integration (in progress)
-- [x] Rust SidecarManager: spawn Node.js, stdio NDJSON, query/stop/shutdown (sidecar.rs, 218 lines)
-- [x] Node.js agent-runner: spawns `claude -p --output-format stream-json`, manages sessions (agent-runner.ts, 176 lines)
-- [x] Tauri commands: agent_query, agent_stop, agent_ready in lib.rs
-- [x] Sidecar auto-start on app launch
-- [x] SDK message adapter: full stream-json parser with 9 typed message types (sdk-messages.ts, 234 lines)
-- [x] Agent bridge: Tauri IPC adapter for sidecar communication (agent-bridge.ts, 53 lines)
-- [x] Agent dispatcher: routes sidecar events to agent store (agent-dispatcher.ts, 87 lines)
-- [x] Agent store: session state with messages, cost tracking (agents.svelte.ts, 91 lines)
-- [x] AgentPane component: prompt input, message rendering, stop button, cost display (AgentPane.svelte, 420 lines)
-- [x] UI integration: Ctrl+Shift+N for new agent, sidebar agent button, TilingGrid routing
-
-Architecture decision: Initially used `claude` CLI with `--output-format stream-json`. Migrated to `@anthropic-ai/claude-agent-sdk` query() due to CLI piped stdio hang bug (#6775). SDK outputs same message format, so adapter unchanged.
-
-### Bug Fix: Svelte 5 Rune File Extensions (2026-03-06)
-- [x] Diagnosed blank screen / "rune_outside_svelte" runtime error
-- [x] Root cause: store files used `.ts` extension but contain Svelte 5 `$state`/`$derived` runes, which only work in `.svelte` and `.svelte.ts` files
-- [x] Renamed: `layout.ts` -> `layout.svelte.ts`, `agents.ts` -> `agents.svelte.ts`, `sessions.ts` -> `sessions.svelte.ts`
-- [x] Updated all import paths in 5 files to use `.svelte` suffix (e.g., `from './stores/layout.svelte'`)
-
-### Phase 3 Polish (2026-03-06)
-- [x] Sidecar crash detection: dispatcher listens for sidecar-exited event, marks running sessions as error
-- [x] Restart UI: "Restart Sidecar" button in AgentPane error bar, calls agent_restart command
-- [x] Auto-scroll lock: scroll handler disables auto-scroll when user scrolls >50px from bottom, "Scroll to bottom" button appears
-
-### Phase 4: Session Management + Markdown Viewer (2026-03-06)
-- [x] rusqlite 0.31 (bundled) + dirs 5 + notify 6 added to Cargo.toml
-- [x] SessionDb: SQLite with WAL mode, sessions table + layout_state singleton
-- [x] Session CRUD: list, save, delete, update_title, touch (7 Tauri commands)
-- [x] Frontend session-bridge.ts: typed invoke wrappers for all session/layout commands
-- [x] Layout store wired to persistence: addPane/removePane/focusPane/setPreset all persist
-- [x] restoreFromDb() on app startup restores panes in layout order
-- [x] FileWatcherManager: notify crate watches files, emits Tauri "file-changed" events
-- [x] MarkdownPane component: marked.js rendering, Catppuccin-themed styles, live reload
-- [x] Sidebar "M" button opens file picker for .md/.markdown/.txt files
-- [x] TilingGrid routes markdown pane type to MarkdownPane component
-
-### Phase 5: Agent Tree + Polish (2026-03-06, complete)
-- [x] Agent tree visualization (SVG): AgentTree.svelte component with horizontal tree layout, bezier edges, status-colored nodes; agent-tree.ts utility (buildAgentTree, countTreeNodes, subtreeCost)
-- [x] Agent tree toggle in AgentPane: collapsible tree view shown when tool_call messages exist
-- [x] Global status bar: StatusBar.svelte showing terminal/agent pane counts, active agents with pulse animation, total tokens and cost
-- [x] Notification system: notifications.svelte.ts store (notify, dismissNotification, max 5 toasts, 4s auto-dismiss) + ToastContainer.svelte (slide-in animation, color-coded by type)
-- [x] Agent dispatcher notifications: toast on agent_stopped (success), agent_error (error), sidecar crash (error), cost result (success with cost/turns)
-- [x] Settings dialog: SettingsDialog.svelte modal (default shell, cwd, max panes, theme flavor) with settings-bridge.ts adapter
-- [x] Settings backend: settings table (key/value) in session.rs, Tauri commands settings_get/set/list in lib.rs
-- [x] Keyboard shortcuts: Ctrl+W close focused pane, Ctrl+, open settings dialog
-- [x] CSS grid update: app.css grid-template-rows '1fr' -> '1fr auto' for status bar row
-- [x] App.svelte: integrated StatusBar, ToastContainer, SettingsDialog components
-
-### Phase 6: Packaging + Distribution (2026-03-06)
-- [x] Created install-v2.sh — build-from-source installer with 6-step dependency check process
-  - Checks Node.js 20+, Rust 1.77+, system libs (WebKit2GTK, GTK3, GLib, etc.)
-  - Prompts to install missing packages via apt
-  - Builds with `npx tauri build`, installs to ~/.local/bin/bterminal-v2
-  - Creates desktop entry and installs SVG icon
-- [x] Updated v2/src-tauri/tauri.conf.json: bundle targets ["deb", "appimage"], category, descriptions, deb depends, appimage settings
-- [x] Regenerated all icons in v2/src-tauri/icons/ from bterminal.svg as RGBA PNGs (32x32, 128x128, 256x256, 512x512, .ico)
-- [x] Created .github/workflows/release.yml — CI workflow triggered on v* tags
-  - Ubuntu 22.04 runner, caches Rust/npm deps
-  - Builds .deb + AppImage, uploads as GitHub Release artifacts via softprops/action-gh-release@v2
-- [x] Build verified: .deb (4.3 MB), AppImage (103 MB) both built successfully
-- [ ] Tauri auto-update plugin deferred (needs signing key + update server)
-
-### Phase 5 continued: SSH, ctx, themes, detached mode, auto-updater (2026-03-06)
-- [x] ctx integration: Rust ctx.rs (read-only CtxDb with SQLITE_OPEN_READ_ONLY), 5 Tauri commands (ctx_list_projects, ctx_get_context, ctx_get_shared, ctx_get_summaries, ctx_search), ctx-bridge.ts adapter, ContextPane.svelte (project selector, tabs for entries/summaries/search)
-- [x] SSH session management: SshSession struct + ssh_sessions table in session.rs, 3 Tauri commands (ssh_session_list/save/delete), ssh-bridge.ts adapter, SshDialog.svelte (create/edit modal with validation), SshSessionList.svelte (grouped by folder, color dots)
-- [x] TilingGrid SSH routing: SSH pane type routes to TerminalPane with shell=/usr/bin/ssh and constructed args array
-- [x] Catppuccin theme flavors: themes.ts with all 4 palettes (Latte/Frappe/Macchiato/Mocha), theme.svelte.ts reactive store, SettingsDialog flavor dropdown, TerminalPane uses getXtermTheme(), persistence via SQLite settings
-- [x] Detached pane mode: detach.ts utility (isDetachedMode, getDetachedConfig from URL params), App.svelte renders single pane in full-viewport without chrome when ?detached=1
-- [x] Syntax highlighting: highlight.ts with Shiki lazy singleton (13 preloaded languages, catppuccin-mocha theme), integrated into MarkdownPane and AgentPane text messages
-- [x] Tauri auto-updater plugin: tauri-plugin-updater (Rust) + @tauri-apps/plugin-updater (npm) + updater.ts frontend utility
-- [x] AgentPane markdown rendering: text messages now rendered as markdown with Shiki highlighting
-- [x] New npm dependencies: shiki, @tauri-apps/plugin-updater
-- [x] New Rust dependency: tauri-plugin-updater
-
-### Session: 2026-03-06 (continued) — Polish, Testing, Extras
-
-#### Terminal Copy/Paste + Theme Hot-Swap
-- [x] Copy/paste in TerminalPane via Ctrl+Shift+C/V (attachCustomKeyEventHandler: C copies selection, V reads clipboard and writes to PTY)
-- [x] Theme hot-swap: onThemeChange() callback registry in theme.svelte.ts, TerminalPane subscribes and updates term.options.theme on flavor change
-- [x] All open terminals now update immediately when theme flavor changes
-
-#### Agent Tree Enhancements
-- [x] Click tree node -> scroll to corresponding message (handleTreeNodeClick in AgentPane, scrollIntoView with smooth behavior)
-- [x] Subtree cost display: yellow cost text below each tree node label (subtreeCost from agent-tree.ts, NODE_H increased from 32 to 40)
-- [x] Each message div has id="msg-{msg.id}" for scroll targeting
-
-#### Session Resume
-- [x] Follow-up prompt input appears after session completes or errors (if sdkSessionId exists)
-- [x] startQuery(text, resume=true) passes resume_session_id to SDK via agent_query
-- [x] Styled .follow-up input + button in done-bar and error-bar sections
-
-#### Pane Drag-Resize Handles
-- [x] Splitter overlays in TilingGrid (positioned with fixed CSS, outside grid to avoid layout interference)
-- [x] Column splitters: vertical bars between grid columns with mousemove drag
-- [x] Row splitters: horizontal bars between grid rows with mousemove drag
-- [x] customColumns/customRows $state override preset grid-template; reset on preset change
-- [x] Supports 2-col, 3-col, and 2-row layouts with min 10% / max 90% ratio clamping
-- [x] .dragging class disables user-select during drag; splitter hover shows accent color at 40% opacity
-
-#### Auto-Update Workflow Enhancement
-- [x] release.yml: TAURI_SIGNING_PRIVATE_KEY + PASSWORD env vars passed to build step
-- [x] Generates latest.json for auto-updater (version, pub_date, platform URL, signature from .sig file)
-- [x] Uploads latest.json alongside .deb and .AppImage as release artifacts
-
-#### Deno Sidecar Evaluation
-- [x] Created agent-runner-deno.ts proof-of-concept (Deno.Command for claude CLI, TextLineStream for NDJSON)
-- [x] Same NDJSON protocol as Node.js version; compiles to single binary with deno compile
-- [ ] Not yet integrated with Rust SidecarManager; needs real-world testing
-
-#### Testing Infrastructure
-- [x] Vitest added: vitest ^4.0.18 dev dependency, vite.config.ts test config, npm run test script
-- [x] sdk-messages.test.ts: tests for adaptSDKMessage() — init, text, thinking, tool_use, tool_result, cost, unknown types
-- [x] agent-tree.test.ts: tests for buildAgentTree(), countTreeNodes(), subtreeCost()
-- [x] Cargo: tempfile 3 dev dependency added
-- [x] session.rs tests: SessionDb CRUD (sessions, SSH sessions, settings, layout), uses tempfile::tempdir()
-- [x] ctx.rs tests: CtxDb error handling with missing database (conn=None)
-
-### Session: 2026-03-06 (continued) — Session Groups, Auto-Update Key, Deno Sidecar, Tests
-
-#### Auto-Update Signing Key
-- [x] Generated Tauri signing keypair (minisign)
-- [x] Set pubkey in tauri.conf.json updater.pubkey field (base64 encoded)
-- [x] Private key to be stored as TAURI_SIGNING_PRIVATE_KEY GitHub secret by user
-
-#### Session Groups/Folders
-- [x] Added group_name column to sessions table (session.rs, ALTER TABLE migration with pragma_table_info check)
-- [x] Session struct: added group_name field with #[serde(default)]
-- [x] SessionDb: update_group(id, group_name) method + save/list queries updated
-- [x] Tauri command: session_update_group registered in lib.rs
-- [x] Frontend: updateSessionGroup() in session-bridge.ts
-- [x] Layout store: Pane.group? field, setPaneGroup(id, group) function in layout.svelte.ts
-- [x] SessionList.svelte: grouped sidebar with collapsible headers (arrow + count), right-click to set group via prompt()
-- [x] Svelte 5 snippet pattern used for paneItem to avoid duplication across grouped/ungrouped rendering
-
-#### Deno Sidecar Integration (upgraded from PoC)
-- [x] SidecarCommand struct in sidecar.rs: { program, args } abstracts runtime choice
-- [x] resolve_sidecar_command(): Deno-first resolution (checks agent-runner-deno.ts + deno availability), Node.js fallback
-- [x] Both sidecar runners bundled in tauri.conf.json resources array
-- [x] Graceful fallback: if Deno binary not found in PATH, falls back to Node.js with log warning
-
-#### E2E/Integration Tests
-- [x] layout.test.ts (30 tests): addPane, removePane, focusPane, setPreset, autoPreset, getGridTemplate, getPaneGridArea, renamePaneTitle, setPaneGroup
-- [x] agent-bridge.test.ts (11 tests): Tauri IPC mock pattern with vi.hoisted(), invoke/listen wrappers
-- [x] agent-dispatcher.test.ts (18 tests): sidecar event routing, crash detection, vi.useFakeTimers() for async setTimeout
-- [x] sdk-messages.test.ts rewrite (25 tests): removed unused ErrorContent import
-- [x] E2E scaffold: v2/tests/e2e/README.md documenting WebDriver approach
-- [x] Total: 104 vitest tests + 29 cargo tests, all passing
-
-Build status: TypeScript 0 errors, Rust 0 errors (1 pre-existing warning), all tests green.
-
-### Session: 2026-03-06 (continued) — Agent Teams / Subagent Support
-
-#### Agent Teams Frontend Support
-- [x] Agent store: AgentSession extended with parentSessionId?, parentToolUseId?, childSessionIds[] for parent-child hierarchy
-- [x] Agent store: createAgentSession() accepts optional parent param, registers bidirectional parent/child links
-- [x] Agent store: findChildByToolUseId(parentId, toolUseId), getChildSessions(parentId) query functions
-- [x] Agent store: removeAgentSession() cleans up parent's childSessionIds on removal
-- [x] Agent dispatcher: SUBAGENT_TOOL_NAMES detection ('Agent', 'Task', 'dispatch_agent') on tool_call events
-- [x] Agent dispatcher: spawnSubagentPane() creates child session + layout pane, auto-groups under parent title
-- [x] Agent dispatcher: toolUseToChildPane Map routes messages with parentId to correct child pane
-- [x] Agent dispatcher: handleAgentEvent() splits messages — parentId-bearing go to child panes, rest to parent
-- [x] AgentPane: parent link bar (SUB badge + navigate-to-parent button)
-- [x] AgentPane: children bar (chips per child subagent, status-colored, clickable to focus)
-- [x] SessionList: subagent panes show '↳' icon instead of '*'
-
-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
+> Earlier sessions (2026-03-05 to 2026-03-06 early): see [progress-archive.md](progress-archive.md)
 
 ### Session: 2026-03-06 (continued) — Multi-Machine Architecture Design
 
@@ -349,65 +99,52 @@ Design: No separate sidecar process per subagent. Parent's sidecar handles all;
 
 #### CLAUDE* Environment Variable Leak (critical fix)
 - [x] Diagnosed silent hang in agent sessions when BTerminal launched from Claude Code terminal
-- [x] Root cause: Claude Code sets ~8 CLAUDE* env vars (CLAUDECODE, CLAUDE_ORIGPROMPT, CLAUDE_BASH_MAINTAIN_CWD, CLAUDE_BASH_SANDBOX_DIR, etc.) for nesting/sandbox detection. Previous fix only removed CLAUDECODE, but the CLI checks multiple indicators.
-- [x] Fixed agent-runner.ts: replaced `{ ...process.env, CLAUDECODE: undefined }` with clean env object filtering out all keys starting with 'CLAUDE'
-- [x] Fixed agent-runner-deno.ts: same approach, iterate Deno.env.toObject() and skip CLAUDE-prefixed keys
-- [x] Pre-built dist/agent-runner.mjs already updated with the fix
+- [x] Root cause: Claude Code sets ~8 CLAUDE* env vars for nesting/sandbox detection
+- [x] Fixed both sidecar runners to filter out all keys starting with 'CLAUDE'
 
 ### Session: 2026-03-06 (continued) — Sidecar SDK Migration
 
 #### Migration from CLI Spawning to Agent SDK
-- [x] Diagnosed root cause of silent agent sessions: claude CLI v2.1.69 hangs when spawned via child_process.spawn() with piped stdio (known bug: github.com/anthropics/claude-code/issues/6775)
-- [x] Migrated agent-runner.ts from `child_process.spawn('claude', ...)` to `@anthropic-ai/claude-agent-sdk` query() function
-- [x] Migrated agent-runner-deno.ts from `Deno.Command('claude', ...)` to `import { query } from "npm:@anthropic-ai/claude-agent-sdk"`
-- [x] Added @anthropic-ai/claude-agent-sdk ^0.2.70 as npm dependency
-- [x] SDK query() returns async iterable of messages — same format as CLI stream-json, so sdk-messages.ts adapter unchanged
-- [x] Session stop now uses AbortController.abort() instead of process.kill()
-- [x] CLAUDE* env var stripping preserved via SDK's `env` option in query() options
-- [x] Updated sidecar.rs Deno permissions: added --allow-write and --allow-net (required by SDK)
-- [x] Added build:sidecar script to package.json (esbuild bundle, SDK included)
-- [x] SDK options: permissionMode configurable (default 'bypassPermissions'), allowDangerouslySkipPermissions conditional, 10 allowedTools
-- [x] Tested standalone: SDK sidecar successfully produced agent output
-- [x] All 114 vitest tests pass, Rust compiles clean
+- [x] Diagnosed root cause: claude CLI v2.1.69 hangs with piped stdio (bug #6775)
+- [x] Migrated both runners to @anthropic-ai/claude-agent-sdk query() function
+- [x] Added build:sidecar script (esbuild bundle, SDK included)
+- [x] SDK options: permissionMode configurable, allowDangerouslySkipPermissions conditional
 
 #### Bug Found and Fixed
-- [x] AgentPane.svelte onDestroy calls stopAgent() on component unmount — kills running sessions when panes are switched/collapsed, not just when explicitly closed (FIXED: see below)
+- [x] AgentPane onDestroy killed running sessions on layout remounts (fixed: moved to TilingGrid onClose)
 
 ### Session: 2026-03-06 (continued) — Permission Mode, AgentPane Bug Fix, SDK Bundling
 
 #### Permission Mode Passthrough
-- [x] Added `permission_mode` field to AgentQueryOptions in bterminal-core/src/sidecar.rs
-- [x] Added `permissionMode` to QueryMessage interface in both sidecar runners (agent-runner.ts, agent-runner-deno.ts)
-- [x] SDK options now use dynamic permissionMode: defaults to 'bypassPermissions', supports 'default' mode
-- [x] allowDangerouslySkipPermissions conditionally set based on permissionMode value
-- [x] Added `permission_mode` to AgentQueryOptions in agent-bridge.ts frontend adapter
+- [x] permission_mode field flows Rust -> sidecar -> SDK, defaults to 'bypassPermissions'
 
 #### AgentPane onDestroy Bug Fix
-- [x] Removed onDestroy stopAgent() from AgentPane.svelte — it was killing running agents on layout remounts
-- [x] Moved stop-on-close logic to TilingGrid.svelte onClose handler: checks pane type is 'agent' and session status is running/starting before stopping
-- [x] Added comment in AgentPane explaining why onDestroy must NOT stop agents
+- [x] Stop-on-close moved from AgentPane onDestroy to TilingGrid onClose handler
 
 #### SDK Bundling Fix
-- [x] Removed `--external:@anthropic-ai/claude-agent-sdk` from esbuild build:sidecar script in package.json
-- [x] SDK is now bundled into sidecar/dist/agent-runner.mjs (no external dependency at runtime)
+- [x] SDK bundled into agent-runner.mjs (no external dependency at runtime)
 
 ### Session: 2026-03-07 — Unified Sidecar Bundle
 
 #### Sidecar Resolution Simplification
-- [x] Consolidated sidecar from two runners (agent-runner-deno.ts + agent-runner.ts) to single pre-built bundle (dist/agent-runner.mjs)
-- [x] resolve_sidecar_command() in bterminal-core/src/sidecar.rs: checks deno/node availability upfront, searches for dist/agent-runner.mjs only
-- [x] Removed agent-runner-deno.ts from tauri.conf.json resources array (only agent-runner.mjs bundled)
-- [x] Same .mjs bundle runs under both Deno and Node.js — no separate TS source needed at runtime
-- [x] Error message now includes runtime availability note when neither deno nor node found
-- [x] agent-runner-deno.ts file retained in repo for reference but no longer used by SidecarManager
+- [x] Consolidated to single pre-built bundle (dist/agent-runner.mjs) running on both Deno and Node.js
+- [x] resolve_sidecar_command() checks runtime availability upfront, prefers Deno
+- [x] agent-runner-deno.ts retained in repo but not used by SidecarManager
 
 ### Session: 2026-03-07 (continued) — Rust-Side CLAUDE* Env Var Stripping
 
 #### Dual-Layer Env Var Stripping
-- [x] Added CLAUDE* env var stripping in Rust SidecarManager (bterminal-core/src/sidecar.rs)
-- [x] Uses env_clear() + envs(clean_env) on Command to strip all CLAUDE-prefixed vars before spawning sidecar process
-- [x] This is the primary defense — ensures no CLAUDE* vars reach the sidecar regardless of JS runtime
-- [x] JS-side stripping (agent-runner.ts/agent-runner-deno.ts via SDK `env` option) retained as defense-in-depth
+- [x] Rust SidecarManager uses env_clear() + envs(clean_env) before spawn (primary defense)
+- [x] JS-side stripping retained as defense-in-depth
+
+### Session: 2026-03-07 (continued) — Claude CLI Path Detection
+
+#### pathToClaudeCodeExecutable for SDK
+- [x] Added findClaudeCli() to agent-runner.ts (Node.js): checks ~/.local/bin/claude, ~/.claude/local/claude, /usr/local/bin/claude, /usr/bin/claude, then falls back to `which claude`/`where claude`
+- [x] Added findClaudeCli() to agent-runner-deno.ts (Deno): same candidate paths, uses Deno.statSync() + Deno.Command("which")
+- [x] Both runners now pass pathToClaudeCodeExecutable to SDK query() options
+- [x] Early error: if Claude CLI not found, agent_error emitted immediately instead of cryptic SDK failure
+- [x] CLI path resolved once at sidecar startup, logged for debugging
 
 ### Next Steps
 - [ ] Real-world relay testing (2 machines)