Introduce configuration initialization #7
Description
Summary
Build the sess config init workflow described in Phase 4 so users can set global and per-repository defaults interactively.
Motivation
- README.md Phase 4 and docs/technical-spec.md specify configuration management as a key milestone.
- Centralized configuration reduces ceremony for branch prefixes, base branch selection, and PR templates.
Scope
- Add sess config init that writes to ~/.sess-cli/config.json and optional repo-level overrides.
- Support settings for organization, default base branch, branch prefixes, PR template path, and hooks.
- Validate inputs and provide sensible defaults matching current behavior.
- Ensure other commands consume the new configuration (e.g., start/end workflows).
- Document the hierarchy (global vs. per-repo) and persistence locations.
Out of Scope
- GUI configuration tools.
- Remote/shared configuration.
Acceptance Criteria
- Running the command produces config files matching the documented schema.
- Commands respect overrides without requiring manual flag passing.
- Documentation updates explain usage and precedence.
References
- README.md (Phase 4 roadmap)
- docs/technical-spec.md
- docs/DEVELOPMENT.md