Create folder during init

[banrahan]

Related to #8209, example implementation for changing azd ai agent init to create a new dir when init'ing from a sample.

[Copilot]

Pull request overview

This PR updates the azd ai agent init flow (azure.ai.agents extension) to mimic git clone behavior by creating a new subdirectory when initializing from a sample/template, reducing the risk of writing project files into an unexpected directory (e.g., a user’s home folder).

Changes:

• Add a targetDir parameter to the shared manifest init path so project scaffolding can occur in a chosen directory.
• When initializing from a template, derive a folder name from the template title, run azd init into that folder, and chdir the extension process to keep subsequent file operations aligned.
• Print a follow-up message indicating where the project was created.

Comments suppressed due to low confidence (1)

cli/azd/extensions/azure.ai.agents/internal/cmd/init.go:716

• This env name construction appends "-dev" after sanitization, which can produce names longer than azd's 64-char environment name limit (cli/azd/pkg/environment/environment.go:150-152) when envBase is long. To avoid azd init failing, sanitize/truncate the complete "-dev" value (or leverage azd's environment name cleaning) so the final length is guaranteed valid.

			sanitizedDirectoryName := sanitizeAgentName(envBase)
			initArgs = append(
				initArgs, "--environment", sanitizedDirectoryName+"-dev",
			)

[jongio]

Issues to address:

• init.go:494 - folder name derivation is duplicated between the TemplateTypeAzd and default cases; extract a helper

[jongio]

[MEDIUM] The title-to-folder-name derivation (strip parenthetical + sanitize) is copy-pasted here and in the TemplateTypeAzd case (~line 416). Pull it into a small helper so the logic lives in one place:

Suggested change

	title := selectedTemplate.Title
	if idx := strings.IndexByte(title, '('); idx >= 0 {
	title = strings.TrimSpace(title[:idx])
	}
	folderName := sanitizeAgentName(title)
	folderName := folderNameFromTitle(selectedTemplate.Title)

Then add near sanitizeAgentName in init_from_code.go:

func folderNameFromTitle(title string) string {
if idx := strings.IndexByte(title, '('); idx >= 0 {
title = strings.TrimSpace(title[:idx])
}
return sanitizeAgentName(title)
}

Update the TemplateTypeAzd case (~line 416-420) the same way.