Add release script

[SamMorrowDrums]

Adds a release tagging script, with a dry run.

Dry run output

script/tag-release v0.6.0 --dry-run

Fails if tag is wrong format

script/tag-release v1
Error: Tag must be in format vX.Y.Z or vX.Y.Z-suffix (e.g., v1.0.0 or v1.0.0-rc1)

Fails due to missing tag

script/tag-release                 
Error: No tag specified.
Usage: ./script/tag-release vX.Y.Z [--dry-run]

Fails if tag already exists locally

script/tag-release v0.6.0 --dry-run
DRY RUN: No changes will be pushed to the remote repository.

Fetching latest changes from origin...
✅ Local 'main' branch is up-to-date with 'origin/main'.
Error: Tag v0.6.0 already exists locally.

Fails due to wrong branch, or being out of date

script/tag-release v0.6.0 --dry-run     
DRY RUN: No changes will be pushed to the remote repository.

Error: You must be on the 'main' branch to create a release.
Current branch is 'release-process'.

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