feat(Mountain): Add Node binary resolver and extension path environment variables

Implement two significant features for Cocoon sidecar spawning and extension management:

1. **NodeResolver (Atom N1):** New module that resolves Node.js binary for Cocoon spawn, checking in order: explicit override (LAND_NODE_BINARY), shipped runtime (Tauri bundle or dev-tree sibling), version managers (fnm, volta, asdf, nvm), Homebrew, and PATH fallback. Logs source for forensics.

2. **Extension path configuration (Atom U1):** Add support for environment variables controlling extension scan paths:
  - LAND_DISABLE_BUILTIN_EXTENSIONS: Same effect as LAND_SKIP_BUILTIN_EXTENSIONS
  - LAND_BUILTIN_EXTENSIONS_DIR: Override bundle path for CI builds
  - LAND_USER_EXTENSIONS_DIR: Override ~/.land/extensions for sandboxes
  - LAND_EXTRA_EXTENSIONS_DIRS: Multi-path separator (semicolon Windows, colon elsewhere)
  - LAND_DEV_EXTENSIONS_DIR: Development extensions that always load

3. **Profile sentinel fix:** Replace runtime std::env::var("LAND_PROFILE") with compile-time option_env! in build.rs so profile resolves correctly after binary launch (previously showed "unknown" when run outside Build.sh shell).

4. **IPC handler improvements:** Add extensions:resetPinnedStateForAllUserExtensions handler (Atom P1), improve error handling in showSaveDialog/showMessageBox with proper Join handling.

Author: NikolaRHristov

CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to Mountain (Rust Backend) are documented here.
 Format: [Keep a Changelog](https://keepachangelog.com/).
 
-## [v2.1] — Q2 2026: Full Workbench Lift
+## [v2.1] - Q2 2026: Full Workbench Lift
 
 ### Added
 
@@ -43,20 +43,20 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - node_modules path resolution in vscode-file scheme handler
 - Cocoon connection retry intervals with race condition prevention
 
-## [v2.0] — Q1 2026: Editor Launch Sprint
+## [v2.0] - Q1 2026: Editor Launch Sprint
 
 ### January (374 commits): Foundation and Binary Module Architecture
 
 #### Added
 
 - `Source/Binary/` modular startup system:
-  - `Tray/` — SwitchTrayIcon.rs, EnableTray.rs
-  - `Shutdown/` — SchedulerShutdown.rs, RuntimeShutdown.rs
-  - `Service/` — VineStart.rs (gRPC on 50051/50052), CocoonStart.rs,
+  - `Tray/` - SwitchTrayIcon.rs, EnableTray.rs
+  - `Shutdown/` - SchedulerShutdown.rs, RuntimeShutdown.rs
+  - `Service/` - VineStart.rs (gRPC on 50051/50052), CocoonStart.rs,
     ConfigurationInitialize.rs
-  - `Register/` — AdvancedFeaturesRegister.rs, IPCServerRegister.rs,
+  - `Register/` - AdvancedFeaturesRegister.rs, IPCServerRegister.rs,
     StatusReporterRegister.rs, WindSyncRegister.rs
-  - `Initialize/` — RuntimeBuild.rs, StateBuild.rs, CLI argument parser,
+  - `Initialize/` - RuntimeBuild.rs, StateBuild.rs, CLI argument parser,
     dynamic port selection
 - 20+ Tauri commands exposed: WorkbenchConfigurationQuery,
   DesktopConfigurationQuery, UpdateSubscriptionEndpoint, TrayIconSwitch,
@@ -87,7 +87,7 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 
 #### Added
 
-- `Source/ApplicationState/State/FeatureState/Debug/` — DebugState.rs (155
+- `Source/ApplicationState/State/FeatureState/Debug/` - DebugState.rs (155
   lines) with DebugConfigurationProviderRegistration and
   DebugAdapterDescriptorFactoryRegistration
 - TreeView badge: SetBadge() method with length validation
@@ -102,11 +102,11 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
   display_name → extension_id, GitExecRequest repository/cwd →
   repository_path/args
 
-## [v1.3] — Q4 2025: Dependency Maintenance
+## [v1.3] - Q4 2025: Dependency Maintenance
 
 ### Added
 
-- `gen/schemas/macOS-schema.json` — platform-specific capabilities for tray,
+- `gen/schemas/macOS-schema.json` - platform-specific capabilities for tray,
   menu bar, dock integration
 
 ### Changed
@@ -115,7 +115,7 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - actions/checkout 5.0.0 → 6.0.1
 - Regular `.github/Update.md` auto-increments
 
-## [v1.2] — Q3 2025: Full Stack Integration
+## [v1.2] - Q3 2025: Full Stack Integration
 
 ### Changed
 
@@ -125,28 +125,28 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - Build artifacts renamed with "22NodeVersion" label for Node.js versioning
 - Windows installer naming standardized across debug/release profiles
 
-## [v1.1] — Q2 2025: Architecture Buildout
+## [v1.1] - Q2 2025: Architecture Buildout
 
-**185 commits — the complete architecture implementation quarter.**
+**185 commits - the complete architecture implementation quarter.**
 
 ### Added
 
-- `Source/Command/` — CommandRegistry, Keybinding, LanguageFeature,
+- `Source/Command/` - CommandRegistry, Keybinding, LanguageFeature,
   SourceControlManagement, TreeView, Bootstrap, Hover
-- `Source/Environment/` — 14 provider implementations: ConfigurationProvider,
+- `Source/Environment/` - 14 provider implementations: ConfigurationProvider,
   DocumentProvider, FileSystemProvider, OutputProvider, SearchProvider,
   SecretProvider, StatusBarProvider, StorageProvider, TerminalProvider,
   TreeViewProvider, UserInterfaceProvider, WebviewProvider, WorkspaceProvider,
   Utility
-- `Source/ProcessManagement/` — CocoonManagement, InitializationData
-- `Source/RunTime/` — ApplicationRunTime executable lifecycle
-- `Source/Track/` — DispatchLogic, EffectCreation (request routing and effect
+- `Source/ProcessManagement/` - CocoonManagement, InitializationData
+- `Source/RunTime/` - ApplicationRunTime executable lifecycle
+- `Source/Track/` - DispatchLogic, EffectCreation (request routing and effect
   system)
-- `Source/Update/` — UpdateService
-- `Source/Workspace/` — WorkSpaceFileService
-- `Source/FileSystem/` — FileExplorerViewProvider
-- `Source/Vine/Server/` — MountainVinegRPCService, Initialize.rs
-- `Source/Vine/Generated/vine_ipc.rs` — 1,714 lines auto-generated from
+- `Source/Update/` - UpdateService
+- `Source/Workspace/` - WorkSpaceFileService
+- `Source/FileSystem/` - FileExplorerViewProvider
+- `Source/Vine/Server/` - MountainVinegRPCService, Initialize.rs
+- `Source/Vine/Generated/vine_ipc.rs` - 1,714 lines auto-generated from
   Vine.proto
 - Node.js sidecar bundled (Target/debug/node.exe, Target/release/node.exe)
 - Build artifacts: .exe, .msi Windows installers
@@ -159,29 +159,29 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - `docs/Deep Dive.md` rewritten (182 lines)
 - License transitioned to CC0 1.0 Universal
 
-## [v1.0] — Q1 2025: Integration Phase
+## [v1.0] - Q1 2025: Integration Phase
 
 ### Added
 
 - `Source/ApplicationState/` reorganization:
-  - `Internal/` — Persistence, Recovery, TextProcessing, PathResolution,
+  - `Internal/` - Persistence, Recovery, TextProcessing, PathResolution,
     ExtensionScanner, Serialization
-  - `DTO/` — 12 DTO classes (DocumentStateDTO, TerminalStateDTO,
+  - `DTO/` - 12 DTO classes (DocumentStateDTO, TerminalStateDTO,
     TreeViewStateDTO, WindowStateDTO, etc.)
-  - `State/` — organized feature state classes
-- `.github/workflows/Auto.yml` (68 lines) — automated update/push CI
-- `Knowledge.dot` + `Knowledge.svg` — module dependency graph (Graphviz)
+  - `State/` - organized feature state classes
+- `.github/workflows/Auto.yml` (68 lines) - automated update/push CI
+- `Knowledge.dot` + `Knowledge.svg` - module dependency graph (Graphviz)
 
 ### Changed
 
 - Deprecated `Source/app_state/` → `Source/ApplicationState/`
 - Cargo.toml: removed 45 redundant entries, added 17 new entries
 
-## [v0.2] — Q4 2024: Architecture Solidification
+## [v0.2] - Q4 2024: Architecture Solidification
 
 ### Added
 
-- `gen/android/` — full Android Gradle project scaffold:
+- `gen/android/` - full Android Gradle project scaffold:
   - AndroidManifest.xml, MainActivity.kt
   - RustPlugin.kt, BuildTask.kt (Rust → Android cross-compilation)
   - Resources: drawable, mipmap (hdpi through xxxhdpi), layout, values
@@ -190,7 +190,7 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - Cargo.toml feature flags: AirIntegration, ExtensionHostCocoon, MistNative,
   Debug, grove, cocoon, terminals, debug-protocol, scm-support, Telemetry
 
-## [v0.1] — Q3 2024: Rapid Development
+## [v0.1] - Q3 2024: Rapid Development
 
 ### Changed
 
@@ -199,19 +199,19 @@ Format: [Keep a Changelog](https://keepachangelog.com/).
 - Binary function refactoring: `Source/Fn/Binary.rs` 106 → ~20 lines
 - Added `Source/Fn/Binary/Notes.md` (91 lines) architecture documentation
 
-## [v0.0] — Q2 2024: Project Inception
+## [v0.0] - Q2 2024: Project Inception
 
 ### Added
 
 - Project relocated from `Editor/editor/src-tauri/` to monorepo root
-- `Source/Library.rs` — single Tauri entry point
-- `tauri.conf.json` (94 lines) — bundle targets: Windows NSIS, macOS DMG, deb
-- `build.rs` — Tauri build system integration
+- `Source/Library.rs` - single Tauri entry point
+- `tauri.conf.json` (94 lines) - bundle targets: Windows NSIS, macOS DMG, deb
+- `build.rs` - Tauri build system integration
 - `.github/workflows/Rust.yml` (78 lines), `GitHub.yml` (57 lines),
   `dependabot.yml`
 - App icons: PNG, ICNS, ICO, Windows tile assets
-- `capabilities/` — Tauri capabilities manifest
-- `gen/schemas/` — desktop-schema.json, windows-schema.json
+- `capabilities/` - Tauri capabilities manifest
+- `gen/schemas/` - desktop-schema.json, windows-schema.json
 
 ### Dependencies (First Release)
 

Cargo.toml

@@ -130,19 +130,19 @@ TierLoggerRing = []
 TierFileSystemLayer4 = []
 # Tier:FindFiles:Layer4 🟣 Experimental
 TierFindFilesLayer4 = []
-# Tier:Glob:Native 🟣 Experimental — globset-compiled patterns
+# Tier:Glob:Native 🟣 Experimental - globset-compiled patterns
 TierGlobNative = []
-# Tier:FileWatcher:Layer4 🟣 Experimental — notify-rs FS events (dep is already on the crate)
+# Tier:FileWatcher:Layer4 🟣 Experimental - notify-rs FS events (dep is already on the crate)
 TierFileWatcherLayer4 = []
 # Tier:SchemeAssets:Hybrid 🟣 Experimental
 TierSchemeAssetsHybrid = []
 # Tier:Configuration:Eager 🟣 Experimental
 TierConfigurationEager = []
 # Tier:Diagnostics:Delta 🟣 Experimental
 TierDiagnosticsDelta = []
-# Tier:Clipboard:Layer4 🟣 Experimental — arboard crate is on the crate unconditionally
+# Tier:Clipboard:Layer4 🟣 Experimental - arboard crate is on the crate unconditionally
 TierClipboardLayer4 = []
-# Tier:OpenExternal:Layer4 🟣 Experimental — `open` crate is on the crate unconditionally
+# Tier:OpenExternal:Layer4 🟣 Experimental - `open` crate is on the crate unconditionally
 TierOpenExternalLayer4 = []
 # Tier:ExtensionScan:Parallel 🟣 Experimental
 TierExtensionScanParallel = []

Source/ApplicationState/DTO/ExtensionDescriptionStateDTO.rs

@@ -49,7 +49,7 @@ const MAX_ACTIVATION_EVENTS:usize = 100;
 pub struct ExtensionDescriptionStateDTO {
 	// --- Core Metadata ---
 	/// Extension identifier: { value: string, uuid?: string }
-	/// Not present in package.json — constructed from publisher.name after
+	/// Not present in package.json - constructed from publisher.name after
 	/// parsing.
 	#[serde(default)]
 	pub Identifier:Value,

Source/ApplicationState/Internal/ExtensionScanner/ScanAndPopulateExtensions.rs

@@ -97,7 +97,7 @@ pub async fn ScanAndPopulateExtensions(
 						rejected_empty_identifier += 1;
 						dev_log!(
 							"extensions",
-							"warn: [ExtensionScanner] Rejected extension '{}' — empty identifier (publisher='{}', \
+							"warn: [ExtensionScanner] Rejected extension '{}' - empty identifier (publisher='{}', \
 							 Identifier={:?})",
 							extension.Name,
 							extension.Publisher,

Source/ApplicationState/State/WorkspaceState/WorkspaceDelta.rs

@@ -34,7 +34,7 @@ fn FolderToWire(Folder:&WorkspaceFolderStateDTO) -> serde_json::Value {
 }
 
 /// Dispatch `$deltaWorkspaceFolders` to Cocoon. Returns immediately if both
-/// arrays are empty — no point waking the sidecar for a no-op mutation.
+/// arrays are empty - no point waking the sidecar for a no-op mutation.
 ///
 /// Errors are logged and swallowed: the workspace state is already updated by
 /// the caller, so a failed notification should not roll the mutation back. The
@@ -77,7 +77,7 @@ pub async fn DispatchDeltaWorkspaceFolders(Added:Vec<WorkspaceFolderStateDTO>, R
 /// Spawns the notification on the current tokio runtime so callers in sync
 /// contexts (Tauri command handlers, boot-time seeding) don't have to build an
 /// async scope just to reach Cocoon. If no runtime is available (very early
-/// boot, unit tests), the notification is dropped — the state still mutates.
+/// boot, unit tests), the notification is dropped - the state still mutates.
 pub fn UpdateWorkspaceFoldersAndNotify(
 	State:&crate::ApplicationState::State::WorkspaceState::State,
 	Folders:Vec<WorkspaceFolderStateDTO>,
@@ -93,7 +93,7 @@ pub fn UpdateWorkspaceFoldersAndNotify(
 	} else {
 		dev_log!(
 			"workspaces",
-			"warn: [LandFix:WsDelta] No tokio runtime available — delta dropped ({} added, {} removed)",
+			"warn: [LandFix:WsDelta] No tokio runtime available - delta dropped ({} added, {} removed)",
 			Added.len(),
 			Removed.len()
 		);
@@ -148,7 +148,7 @@ pub fn UpdateWorkspaceFoldersAndBroadcast<R:tauri::Runtime>(
 
 /// Append every folder in `Added` to `~/.land/workspaces/RecentlyOpened.json`,
 /// deduping by URI and capping at 50 entries (the VS Code default). Swallows
-/// every error — a failed write must not prevent the workspace change.
+/// every error - a failed write must not prevent the workspace change.
 fn PersistRecentlyOpened(Added:&[WorkspaceFolderStateDTO]) {
 	if Added.is_empty() {
 		return;

Source/Binary/Build/LocalhostPlugin.rs

@@ -25,7 +25,7 @@ const OTLP_HOST:&str = "127.0.0.1:4318";
 /// actually loads; the patched plugin keeps our value instead of overwriting.
 ///
 /// Returns `None` for unknown extensions so the plugin's `asset.mime_type`
-/// fallback still applies (e.g. images, fonts, WASM — the asset resolver
+/// fallback still applies (e.g. images, fonts, WASM - the asset resolver
 /// handles those correctly).
 fn MimeFromUrl(Url:&str) -> Option<&'static str> {
 	// Strip query string / fragment before extension match.

Source/Binary/Build/Scheme.rs

@@ -771,7 +771,7 @@ pub fn VscodeFileSchemeHandler<R:tauri::Runtime>(
 	// to render pretty stack traces. Our `Static/Application/` tree ships the
 	// JS files without their `.map` siblings (esbuild's `sourcemap:false` path)
 	// so those requests always 404. Short-circuit here with a clean
-	// `204 No Content` — Chromium treats 204 as "no map available" and moves
+	// `204 No Content` - Chromium treats 204 as "no map available" and moves
 	// on silently, avoiding both the noisy stderr lines and the filesystem
 	// stat round-trip per request.
 	if CleanPath.ends_with(".map") {

Source/Binary/Debug/TraceLog.rs

@@ -1,4 +1,4 @@
-// TraceLog — debug tracing macro for fine-grained execution step tracking.
+// TraceLog - debug tracing macro for fine-grained execution step tracking.
 
 /// Logs a checkpoint message at TRACE level (for "every step" tracing).
 ///