* feat(cli): add openspec config command for global configuration management
Implements the `openspec config` command with subcommands:
- `path`: Show config file location
- `list [--json]`: Show all current settings
- `get <key>`: Get a specific value (raw output for scripting)
- `set <key> <value> [--string]`: Set a value with auto type coercion
- `unset <key>`: Remove a key (revert to default)
- `reset --all [-y]`: Reset configuration to defaults
- `edit`: Open config in $EDITOR/$VISUAL
Key features:
- Dot notation for nested key access (e.g., featureFlags.someFlag)
- Auto type coercion (true/false → boolean, numbers → number)
- --string flag to force string storage
- Zod schema validation with unknown field passthrough
- Reserved --scope flag for future project-local config
- Windows-compatible editor spawning with proper path quoting
- Shell completion registry integration
* test(config): add additional unit tests for validation and coercion
- Add tests for unknown fields with various types
- Add test to verify error message path for featureFlags
- Add test for number values rejection in featureFlags
- Add config set simulation tests to verify full coerce → set → validate flow
* fix(config): avoid shell parsing in config edit to handle paths with spaces
Use spawn with shell: false and pass configPath as an argument instead
of building a shell command string. This correctly handles spaces in
both the EDITOR path and config file path on all platforms.
* chore(openspec): archive add-config-command and create cli-config spec
Move completed change to archive and apply spec deltas to create
the cli-config specification documenting the config command interface.
* Validate config keys on set
Tabish Bidiwale