fix(completion): scan nested commands in unfinished braced args

Make the completion parser inspect nested command segments when an
unfinished braced argument is the active context, instead of treating the
entire braced body as opaque. This resolves cases where inner commands
(e.g. command substitutions) were ignored and improves suggestion
accuracy. Tests were added to cover nested commands inside braced
conditions and to ensure closed braced arguments do not change context.
Also add Linux-specific launch and task configurations to IDE settings
to simplify local extension development and debugging.

- Recursively scan inner context when a braced body is unfinished
- Add tests for nested commands and closed-brace behavior
- Add Linux launch/task entries for easier development

.vscode/launch.json

@@ -17,6 +17,19 @@
             ],
             "cwd": "${env:TEMP}/nx-post-support-vscode-debug",
             "outFiles": ["${env:TEMP}/nx-post-support-vscode-debug/dist/**/*.js"],
+            "linux": {
+                "args": [
+                    "--extensionDevelopmentPath=${workspaceFolder}",
+                    "${workspaceFolder}",
+                    "${workspaceFolder}/test/test.tcl"
+                ],
+                "cwd": "${workspaceFolder}",
+                "outFiles": ["${workspaceFolder}/dist/**/*.js"],
+                "resolveSourceMapLocations": [
+                    "${workspaceFolder}/dist/**/*.js",
+                    "!**/node_modules/**"
+                ]
+            },
             "sourceMaps": true,
             "resolveSourceMapLocations": [
                 "${env:TEMP}/nx-post-support-vscode-debug/dist/**/*.js",
@@ -50,6 +63,19 @@
             ],
             "cwd": "${env:TEMP}/nx-post-support-vscode-debug",
             "outFiles": ["${env:TEMP}/nx-post-support-vscode-debug/dist/**/*.js"],
+            "linux": {
+                "args": [
+                    "--extensionDevelopmentPath=${workspaceFolder}",
+                    "${workspaceFolder}",
+                    "${workspaceFolder}/test/test.tcl"
+                ],
+                "cwd": "${workspaceFolder}",
+                "outFiles": ["${workspaceFolder}/dist/**/*.js"],
+                "resolveSourceMapLocations": [
+                    "${workspaceFolder}/dist/**/*.js",
+                    "!**/node_modules/**"
+                ]
+            },
             "sourceMaps": true,
             "resolveSourceMapLocations": [
                 "${env:TEMP}/nx-post-support-vscode-debug/dist/**/*.js",

.vscode/tasks.json

@@ -15,6 +15,13 @@
                 "${workspaceFolder}",
                 "${env:TEMP}\\nx-post-support-vscode-debug"
             ],
+            "linux": {
+                "command": "npm",
+                "args": ["run", "compile:debug"],
+                "options": {
+                    "cwd": "${workspaceFolder}"
+                }
+            },
             "problemMatcher": [],
             "presentation": {
                 "reveal": "always",