Replace the always-on syncDefaultBranch with opt-in resolveBaseBranch:
- Add auto_fetch config (default: false) — only fetch when enabled
- Add base_branch config (project and global) — fallback to current branch
- Fetch-only mode: git fetch origin without modifying local branches
- Use fetched commit hash (origin/<base_branch>) to reset clone to latest
- No more git merge --ff-only or git fetch origin main:main
Config example:
# ~/.takt/config.yaml or .takt/config.yaml
auto_fetch: true
base_branch: develop
Addresses review feedback: opt-in behavior, no local branch changes,
configurable base branch with current-branch fallback.
