multi(release): Several small updates to toys-release

[dazuma]

fix(release): gen-gh-pages and gen-workflows no longer ask for confirmation if a file to generate is unchanged
fix(release): Release versions can now omit version fields beyond major, e.g. version "1" is now legal

[Copilot]

Pull request overview

This PR updates the toys-release generators to avoid prompting when generated output is unchanged, and relaxes version parsing/updating so major-only versions (e.g. "1") are considered valid.

Changes:

• Skip overwrite/create confirmations when the destination file already exists and has identical content to the generated output.
• Replace existing destinations (including non-regular files) after confirmation by removing the existing entry before writing.
• Update VersionRbFile’s version-matching regex to allow versions with only a major segment.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
toys-release/toys/gen-workflows.rb	Adds content-based “unchanged” detection and removes/recreates destinations on overwrite.
toys-release/toys/gen-gh-pages.rb	Inlines destination checks into generate_file, adds “unchanged” short-circuit, and removes existing entries before writing.
toys-release/toys/.lib/toys/release/version_rb_file.rb	Broadens VERSION regex to allow major-only versions when reading/updating.

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