Issue #105: opencode run --fork/--continue --dir <path> fails to create sessions
Root cause: The --dir flag breaks session creation in opencode. Sessions
fail to be created when --dir is used with --fork or --continue.
Solution: Instead of using --dir flag, create worktrees inside the parent
session's directory and use 'cd $worktree_path && opencode run ...' to
change directory before running opencode.
Key changes:
- Worktrees now created at $PWD/.kugetsu-worktrees/{issue-ref}/ instead
of $WORKTREES_DIR/{issue-ref}/
- .kugetsu-worktrees is a hidden directory (git ignored by default)
- cmd_start and cmd_continue now use 'cd && opencode run' instead of
'opencode run --dir'
This approach works because:
1. Worktree is inside parent's directory tree (permission granted)
2. cd properly changes working directory before opencode runs
3. Session gets created with correct directory set
4. No .gitignore entry needed (. prefix makes it hidden from git)
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