* feat: implement simplified skill installation with profiles and smart defaults
Introduces a profile system (core/custom) to reduce the default workflow
count from 10 to 4, auto-detects AI tools during init, adds a new
`propose` workflow combining new+ff, fixes multi-select keybindings,
and adds backwards-compatible migration for existing users.
* feat: harden update config drift, command-only detection, and init profile validation
Address post-implementation review findings: update now detects profile/delivery
drift even when template versions are current, recognizes command-only installs
as configured tools, init validates --profile values and applies delivery cleanup
on re-init. Specs and design docs updated with new scenarios and rationale.
* fix: address AI reviewer feedback on config, detection, and test cleanup
- Add error handling for execSync in config profile apply and use static import
- Fix config list showing "(explicit)" for core profile workflows misleadingly
- Add missing 'openspec-onboard' to SKILL_NAMES for parity with COMMAND_IDS
- Remove unused fsSync import in init tests
- Fix configTempDir leak in test afterEach cleanup
* docs: add qa smoke harness change proposal
Tabish Bidiwale