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feat(config): configurable base directory for engine-created worktrees

Adds a new worktree_path config option (default ".ralphex/worktrees")
that overrides the previously-hardcoded base directory used by
CreateWorktreeForPlan. Both relative and absolute paths are supported:
relative paths resolve against the repo root; absolute paths are used
as-is, which lets operators keep ralphex worktrees outside the main
checkout entirely (e.g. /var/lib/ralphex-worktrees or a sibling
directory next to the main repo).

Behavior is preserved when the option is left unset because the default
matches the previous hardcoded value. The config is wired through
git.Service via SetWorktreePath, mirroring the existing
SetCommitTrailer pattern.

Tests cover the default, relative, absolute, and reset-to-default
paths, plus the values-loader merge behavior for local-overrides-global.

Co-Authored-By: Claude <noreply@anthropic.com>