claude-manager

Commit changes on the worktree branch, fast-forward merge into the task branch, and push the task branch

Work on a Claude Manager task whose changes ship as a STACK of dependent PRs (one PR per commit, via `git spr`). Use when the task has stacked-PR mode enabled, or the user wants to split a task's work into a chain of small, dependent, independently-reviewable PRs.

Update the shared task context file with current progress