Adds a CLI client for the Gitea EE pull request stack API
(GET/POST /repos/{owner}/{repo}/stacks[/{id}[/entries|/restack|/merge]]):
- modules/stack holds the Stack/Entry/MergeResult types shared between
the API client and its output formatting, avoiding an import cycle
between modules/task and modules/print.
- modules/task/pull_stack.go implements the HTTP calls on top of
modules/api.Client, which gains a context-aware DoContext method.
- modules/print/pull_stack.go formats stack listings (table/json/...)
and a single stack's ordered entries.
- cmd/pulls/stack adds the list, show, push, restack and merge
subcommands, wired in as 'tea pr stack' via cmd/pulls.go, following
the repo/login flag routing used by the rest of the pulls commands.
Assisted-by: Codet:GPT-5-Codex
