feat(pr): Resolve current branch PR for merge, close, and comment

[euxaristia]

Summary

gt pr view already resolves the open PR for the current branch when no number is given, but merge, close, and comment still required an explicit number. This makes the implicit PR context added for view inconsistent across the pr subcommands. Running gt pr merge on a checked-out feature branch now works the same way gt pr view does.

Changes

internal/cmd/pr.go

• Add resolvePRNumber, which uses an explicit argument when present and otherwise looks up the open PR for the current branch via the existing findPRForBranch.
• merge, close, and comment now accept an optional number (cobra.MaximumNArgs(1)) and resolve the repo/token before looking up the branch PR.

Test plan

• go build ./... clean
• go test ./internal/cmd/ -run TestPR 27/27 pass

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0a9d3048-8f05-4bb5-9f20-b3613fb50c56

📥 Commits

Reviewing files that changed from the base of the PR and between d880cc3 and 0b2cba2.

📒 Files selected for processing (1)

• internal/cmd/pr.go

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