feat: add spec-setup command for project initialization and interactive configuration

- Introduced a new command `spec-setup` to initialize project-level state.
- Generates `.workflow/project-tech.json` and `.ccw/specs/*.md` files.
- Implements a multi-round interactive questionnaire for configuring project guidelines.
- Supports flags for regeneration, skipping specs, and resetting existing content.
- Integrates analysis via `cli-explore-agent` for comprehensive project understanding.
- Provides detailed execution process and error handling for various scenarios.

.codex/skills/parallel-dev-cycle/SKILL.md

@@ -119,6 +119,7 @@ Phase 4: Completion & Summary
    └─ Ref: phases/04-completion-summary.md
       ├─ Generate unified summary report
       ├─ Update final state
+      ├─ Sync session state: $session-sync -y "Dev cycle complete: {iterations} iterations"
       ├─ Close all agents
       └─ Output: final cycle report with continuation instructions
 ```