fix(Mountain): Prevent duplicate shutdown and fix static asset path resolution

Add atomic shutdown guard to Entry.rs to prevent the graceful shutdown sequence from running twice. The graceful path ends with `app_handle.exit(0)` which Tauri re-delivers as a second `ExitRequested { code: Some(0) }`. On re-entry we must NOT `prevent_exit` or spawn the shutdown task again — Cocoon has already been SIGKILLed and the second pass would log spurious "tcp connect error" warnings trying to notify a dead sidecar.

Extend the static asset path resolution in Utilities.rs to handle both `/Static/Application/` and `Static/Application/` forms. The webview's WASM loader (`vscode-oniguruma` → `onig.wasm`) resolves asset URLs relative to the current document, which strips the leading slash before the path reaches the `file:read` IPC handler. Without this fix, `tokio::fs::read` would fail with ENOENT, breaking TextMate syntax highlighting.

Also expand the benign ENOENT ignore list in DevLog.rs to suppress warnings for: `.copilot/agents`, `.vscode/tasks.json`, `/User/tasks.json`, `/User/mcp.json`, `vscode-chat-images`, and `/output_<TIMESTAMP>` window log file patterns.

Author: NikolaRHristov

Source/Binary/Main/Entry.rs

@@ -59,6 +59,7 @@
 //! - [ ] Add startup performance metrics
 
 use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, Ordering};
 
 use tauri::{App, Manager, RunEvent, Wry};
 use Echo::Scheduler::{Scheduler::Scheduler, SchedulerBuilder::SchedulerBuilder};
@@ -556,6 +557,18 @@ pub fn Fn() {
 				}
 
 				if let RunEvent::ExitRequested { api, .. } = event {
+					// Shutdown runs once. The graceful path ends with
+					// `app_handle.exit(0)`, which Tauri re-delivers as a
+					// second `ExitRequested { code: Some(0) }`. On re-entry
+					// we must NOT `prevent_exit` or spawn the shutdown task
+					// again - Cocoon has already been SIGKILLed and the
+					// second pass would log spurious "tcp connect error"
+					// warnings trying to notify a dead sidecar.
+					static SHUTTING_DOWN:AtomicBool = AtomicBool::new(false);
+					if SHUTTING_DOWN.swap(true, Ordering::SeqCst) {
+						return;
+					}
+
 					dev_log!(
 						"lifecycle",
 						"warn: [Lifecycle] [Shutdown] Exit requested. Starting graceful shutdown..."

Source/IPC/DevLog.rs

@@ -345,11 +345,13 @@ const BENIGN_ENOENT_SUBSTRINGS:&[&str] = &[
 	".claude/agents",
 	".claude/settings.json",
 	".claude/settings.local.json",
+	".copilot/agents",
 	".github/copilot",
 	".github/agents",
 	".vscode/settings.json",
 	".vscode/launch.json",
 	".vscode/extensions.json",
+	".vscode/tasks.json",
 	"agentPlugins",
 	"agent-plugins",
 	"chatEditingSessions",
@@ -358,6 +360,17 @@ const BENIGN_ENOENT_SUBSTRINGS:&[&str] = &[
 	"machineid",
 	"terminalSuggestGlobalsCacheV2.json",
 	"globalStorage",
+	// Optional user-level workbench config files. On fresh profiles these do
+	// not exist; the workbench probes them on every boot and creates on first
+	// write. These are the `$APP/User/<file>` forms emitted after
+	// `resolve_userdata`.
+	"/User/tasks.json",
+	"/User/mcp.json",
+	// Chat images cache directory is lazy-created on first chat attachment.
+	"vscode-chat-images",
+	// Per-window output channel log files probed lazily by the workbench
+	// before first write. Path shape: `$APP/logs/<SESSION>/window<N>/output_<TIMESTAMP>`.
+	"/output_20",
 	// Virtual scheme misses already covered by earlier batches.
 	"vscode://schemas-associations/",
 ];

Source/IPC/WindServiceHandlers/Utilities.rs

@@ -135,13 +135,24 @@ fn resolve_userdata_path(Path:&str) -> String {
 
 /// Map paths starting with /Static/Application/ to the real Sky Target
 /// directory.
+///
+/// Also accepts the leading-slash-less form `Static/Application/...`: the
+/// webview's WASM loader (`vscode-oniguruma` → `onig.wasm`) resolves the
+/// asset URL relative to the current document, which strips the leading
+/// slash before the path reaches the `file:read` IPC handler. Without this
+/// branch, `tokio::fs::read` would be called with a relative path and fail
+/// with ENOENT, breaking TextMate syntax highlighting.
 fn resolve_static_application_path(Path:&str) -> String {
-	if !Path.starts_with("/Static/Application/") && Path != "/Static/Application" {
+	let Normalized = if Path.starts_with("/Static/Application/") || Path == "/Static/Application" {
+		Path.to_string()
+	} else if Path.starts_with("Static/Application/") || Path == "Static/Application" {
+		format!("/{}", Path)
+	} else {
 		return Path.to_string();
-	}
+	};
 
 	if let Some(Root) = STATIC_APPLICATION_ROOT.get() {
-		let Relative = Path.strip_prefix("/Static/Application").unwrap_or("");
+		let Relative = Normalized.strip_prefix("/Static/Application").unwrap_or("");
 		let Resolved = format!("{}/Static/Application{}", Root, Relative);
 		dev_log!("vfs", "resolve_static: {} -> {}", Path, Resolved);
 		Resolved