Fix missing .gitignore in generated extensions and surface local registry gaps in azd x build

[Copilot]

Resolves #7926

This PR addresses feedback from authoring a Go extension via azd x init, fixing a scaffolding gap, improving azd x build ergonomics, and correcting the framework-services docs.

Scaffolding: embed template dotfiles

The language templates ship a .gitignore (the Go variant excludes bin/), but //go:embed languages silently skips files whose names begin with . or _, so generated extensions had none. Switching to //go:embed all:languages embeds the dotfiles. The only dotfiles under the templates are the four intended .gitignore files (go, python, dotnet, javascript) — there are no stray dotfiles or _-prefixed files that could leak into scaffolded output.

azd x build: warn on local registry gaps

After installing binaries, build now emits a non-fatal warning when ~/.azd/registry.json is missing or doesn't contain the extension. In that state the binaries are installed but the extension won't appear in azd ext list, so the message points the user at azd x pack then azd x publish to register it. This is the recovery the reporter had to reverse-engineer after a dev container rebuild wiped ~/.azd. The warning messages are concise and use color to highlight commands and de-emphasize the registry path, which is shown in full so it remains copy-pasteable across platforms.

Docs (extension-framework-services.md)

Corrected the "Register the Framework Service" snippet — WithFrameworkService takes a provider factory, not an instance — and added the usage property to the extension.yaml snippet.

[Copilot]

Pull request overview

This PR fixes extension scaffolding and improves developer feedback in the microsoft.azd.extensions developer kit extension, addressing gaps encountered when generating and iterating on extensions via azd x init / azd x build. It also corrects extension framework service documentation examples.

Changes:

• Embed template dotfiles by switching to //go:embed all:languages, ensuring generated extensions include language-specific .gitignore files.
• Add a non-fatal azd x build warning when the local source registry (~/.azd/registry.json) is missing/invalid or doesn’t contain the extension id (binaries are installed but the extension won’t appear in azd ext list).
• Fix docs snippets for framework service registration and include the required usage property in the extension.yaml example.

Show a summary per file

File	Description
cli/azd/extensions/microsoft.azd.extensions/version.txt	Bumps extension version to 0.11.2.
cli/azd/extensions/microsoft.azd.extensions/internal/resources/resources.go	Uses all: embedding to include dotfiles like .gitignore.
cli/azd/extensions/microsoft.azd.extensions/internal/resources/resources_test.go	Adds tests ensuring .gitignore files are embedded and Go template ignores bin/.
cli/azd/extensions/microsoft.azd.extensions/internal/cmd/build.go	Adds local-registry gap detection and warning text surfaced during azd x build.
cli/azd/extensions/microsoft.azd.extensions/internal/cmd/build_test.go	Adds unit tests for localRegistryWarning behavior.
cli/azd/extensions/microsoft.azd.extensions/extension.yaml	Updates extension manifest version to 0.11.2.
cli/azd/extensions/microsoft.azd.extensions/CHANGELOG.md	Adds release notes for 0.11.2 covering dotfile embedding and build warnings.
cli/azd/docs/extensions/extension-framework-services.md	Fixes WithFrameworkService example to pass a provider factory and adds usage to extension.yaml snippet.

Copilot's findings

• Files reviewed: 8/8 changed files
• Comments generated: 1

[github-actions]

📋 Prioritization Note

Thanks for the contribution! The linked issue isn't in the current milestone yet.
Review may take a bit longer — reach out to @rajeshkamal5050 or @kristenwomack if you'd like to discuss prioritization.