fix(server): respect fork remotes when creating PRs

[binbandit]

Summary

• resolve PR base repositories from GitHub fork metadata instead of assuming the local tracking remote tells us the whole story
• list PRs against the parent repository and filter by the actual head repository/owner so fork clones and fork worktrees resolve the right PR
• create cross-repo PRs with --repo <base> and --head <owner>:<branch>, and add regression coverage for origin=fork, upstream=base layouts

Problem

The create-pr flow inferred too much from the local remote layout. In a common fork setup where origin points at a fork and upstream points at the main repository, the server could look up and create PRs against the wrong repository. It also depended on owner-qualified gh pr list --head behavior that the real GitHub CLI does not support.

Testing

• bun fmt
• bun lint
• bun typecheck
• bun run test src/git/Layers/GitHubCli.test.ts src/git/Layers/GitManager.test.ts

Note

Fix PR creation and detection to respect fork remotes in GitManager

• Adds getRepositoryMetadata to GitHubCliShape and its implementation, fetching fork status, default branch, and parent repository from gh repo view.
• Refactors resolveBranchHeadContext in GitManager.ts to detect fork remotes and resolve the correct base repository (using parent repo when the head is a fork).
• createPullRequest now passes --repo <base> to gh pr create when a base repository is resolved, targeting the upstream repo instead of the fork.
• PR lookup (findOpenPr, findLatestPr) switches from probing multiple head selector variants to a single gh pr list --repo <base> --head <branch> call filtered by repository/owner match.
• Behavioral Change: PRs created from fork clones now target the parent repository; existing flows using owner-qualified head selectors are replaced by repository-scoped lookups.

^{Macroscope summarized 5e30124.}

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