Add azd tool install/upgrade azure-skills with per-host selection

cli/azd/cmd/testdata/TestFigSpec.ts

@@ -6338,6 +6338,16 @@ const completionSpec: Fig.Spec = {
 							name: ['--dry-run'],
 							description: 'Preview what would be installed without making changes',
 						},
+						{
+							name: ['--host'],
+							description: 'Install the skill for the specified agent host(s): copilot, claude. Use --host all for every detected host (skill tools only)',
+							isRepeatable: true,
+							args: [
+								{
+									name: 'host',
+								},
+							],
+						},
 					],
 					args: {
 						name: 'tool-name...',
@@ -6363,6 +6373,16 @@ const completionSpec: Fig.Spec = {
 							name: ['--dry-run'],
 							description: 'Preview what would be upgraded without making changes',
 						},
+						{
+							name: ['--host'],
+							description: 'Upgrade the skill for the specified agent host(s): copilot, claude. Use --host all for every detected host (skill tools only)',
+							isRepeatable: true,
+							args: [
+								{
+									name: 'host',
+								},
+							],
+						},
 					],
 					args: {
 						name: 'tool-name...',

cli/azd/cmd/testdata/TestUsage-azd-tool-install.snap

@@ -5,8 +5,9 @@ Usage
   azd tool install [tool-name...] [flags]
 
 Flags
-        --all     	: Install all recommended tools
-        --dry-run 	: Preview what would be installed without making changes
+        --all          	: Install all recommended tools
+        --dry-run      	: Preview what would be installed without making changes
+        --host strings 	: Install the skill for the specified agent host(s): copilot, claude. Use --host all for every detected host (skill tools only)
 
 Global Flags
     -C, --cwd string         	: Sets the current working directory.

cli/azd/cmd/testdata/TestUsage-azd-tool-upgrade.snap

@@ -5,7 +5,8 @@ Usage
   azd tool upgrade [tool-name...] [flags]
 
 Flags
-        --dry-run 	: Preview what would be upgraded without making changes
+        --dry-run      	: Preview what would be upgraded without making changes
+        --host strings 	: Upgrade the skill for the specified agent host(s): copilot, claude. Use --host all for every detected host (skill tools only)
 
 Global Flags
     -C, --cwd string         	: Sets the current working directory.