fix(tagmanager): commit modified files before creating tag

[indaco]

Description

Fix tag-manager auto-create to commit all bump-modified files before creating the git tag, ensuring the tag points to the correct release commit.

Previously, when auto-create: true was set, the tag was created immediately after the version bump without committing the modified files first. This meant the tag pointed to the commit before the release changes (.version file, changelog, dependency files, etc.).

Now the flow is: bump -> post-bump actions -> commit all modified files -> create tag on the release commit.

Also adds a new optional commit-message-template config (default: "chore(release): {tag}") to customize the commit message.

Related Issue

Fixes #213

Notes for Reviewers

• auto-create: true now inherently includes the commit step — no separate opt-in needed
• The GitCommitOperations interface follows the same DI pattern as the existing GitTagOperations