[Fix] Scope worktree PR lookup to user branches

[samzong]

What's changed?

• Scope gmc wt --pr review lookup to the current user's pushed worktree branches.
• Cache GitHub PR and GitLab MR lookup results for 5 minutes to reduce repeated remote calls.
• Match review results against live local worktree branch and commit state.

Why

• Full-repository PR listing can miss older user PRs in repositories with very large PR queues.
• Repeated wt --pr runs should avoid unnecessary GitHub/GitLab calls while keeping local worktree state fresh.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Respect non-origin remotes when filtering pushed branches

In repositories whose review remote is not named origin—for example a single GitHub/GitLab remote named upstream or github—this hard-coded refs/remotes/origin/<branch> check makes every worktree look unpushed, so ReviewStates returns before calling detectReviewRemote/the CLI and gmc wt --pr silently shows no PR/MR data. Since reviewRemoteCandidates already supports upstream and a single arbitrary remote, the pushed-branch check should use the selected review remote (or otherwise consider non-origin remotes) rather than only origin.

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