Include active branch name to metadata.json

[Soph]

This is not 100% correct (might commit on main, and then move to branch) but it gives some useful hint which branches are active or were a commit could be found.

[Copilot]

Pull request overview

This pull request adds branch name tracking to checkpoint metadata by capturing the active branch name when checkpoints are created. As noted in the description, the branch name provides a useful hint about which branches are active or where commits could be found, although it may not always be 100% accurate if commits are made on one branch and then moved to another.

Changes:

• Added a Branch field to CommittedMetadata struct and WriteCommittedOptions struct to capture the branch name
• Implemented branch name extraction logic in three checkpoint creation locations (manual commit strategy and two auto-commit strategy methods)
• Added comprehensive test coverage for both branch and detached HEAD scenarios

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
cmd/entire/cli/checkpoint/checkpoint.go	Added Branch field to WriteCommittedOptions and CommittedMetadata structs with appropriate documentation
cmd/entire/cli/checkpoint/committed.go	Updated metadata writing logic to include the new Branch field
cmd/entire/cli/checkpoint/checkpoint_test.go	Added comprehensive tests verifying branch field capture for both branch and detached HEAD states
cmd/entire/cli/strategy/manual_commit_condensation.go	Added branch name extraction logic when condensing manual commit sessions
cmd/entire/cli/strategy/auto_commit.go	Added branch name extraction logic in two methods for committing metadata (regular and task checkpoints)

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