Add a Catalog Snippet for the Release-With-Smoke Caller and Drop Its Placeholder Pins #2854

Problem

The release-with-smoke caller shape is still a placeholder with no catalog snippet.

• docs/reusable-workflows.md:300: "The release-with-smoke shape below keeps the placeholder @<hub-main-commit-sha> # <release-tag> until it has a catalog snippet of its own."
• docs/reusable-workflows.md:352 and :361 are that stub, pinning validate-task.yml and build-release-task.yml to @<hub-main-commit-sha> # <release-tag>. The same placeholder appears at :420, :456, :489, and :498.
• docs/reusable-workflows.md:159: "the release-with-smoke shape reaches the hub's build-release-task.yml by pin, so a snippet of its own is now writable, and this item stays open until one lands."
• catalog/snippets/workflows/ holds test-pull-request.yml (the no-build shape, validate-task.yml only), publish-release.yml, merge-bot-pull-request.yml, and run-periodic-codegen-pull-request.yml, and nothing for a pull-request caller that also smoke-builds through build-release-task.yml.

Impact

An adopter of the smoke shape copies a stub whose pins are unusable and must find a released SHA and tag by hand, with no snippet Dependabot keeps current. The doc itself tracks this as an open item.

Suggested fix

Add a catalog snippet for the release-with-smoke test-pull-request.yml with a released pin, link it from docs/reusable-workflows.md:300, replace the placeholder in the stub with a pointer to it, and tick the item at :159.

Found while: adopting validate-task.yml in ptr727/homeassistant-purpleair

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